Relevant bibliographies by topics / Vertical cylinder

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Vertical cylinder'

Author: Grafiati
Published: 4 June 2021
Last updated: 21 February 2023

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Journal articles on the topic "Vertical cylinder"

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CHAPLIN, J. R., R. C. T. RAINEY, and R. W. YEMM. "Ringing of a vertical cylinder in waves." Journal of Fluid Mechanics 350 (November 10, 1997): 119–47. http://dx.doi.org/10.1017/s002211209700699x.

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This paper analyses the results of two series of experiments concerned with the response of a single vertical cylinder in the inertia regime in steep non-breaking waves. We recorded first the loading on a cylinder when it was held stationary, and secondly, its response in the same waves when it was pivoted just above the floor of the wave flume, and supported at the top by springs in the horizontal plane. Spring stiffnesses were set to achieve natural frequencies (measured in still water) in the range between 3 and 11 times the dominant wave frequency. The experiments were repeated with cylinders of three different diameters.Peak loading on stationary cylinders was found to exceed the predictions of a Morison model (based on kinematics computed from a numerical model of the measured waves), though improvements were achieved through the inclusion of slender-body terms. Measured ringing responses are generally in good agreement with those computed on a quasi-static basis from the measured loading history, but in some conditions, particularly at low frequency ratios, there is clearly some feedback from the motion to the excitation. Peak accelerations in the steepest waves are found to be limited approximately to those that would occur if the maximum loading were applied as a step change. Particular attention is given to a rapid cycle of loading that occurs after the crest has passed the cylinder's axis, and to images of the flow around the cylinder at the water surface.
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Rasin, Boris, Benjamin J. Lindsay, Xingchen Ye, Jeffrey S. Meth, Christopher B. Murray, Robert A. Riggleman, and Russell J. Composto. "Nanorod position and orientation in vertical cylinder block copolymer films." Soft Matter 16, no. 12 (2020): 3005–14. http://dx.doi.org/10.1039/d0sm00043d.

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Li, Shengli, Ruiqing Han, Pan Guo, Xidong Wang, and Yajie Chu. "Wind tunnel tests of aerodynamic interference effects on two iced vertical circular cylinders in a tandem arrangement." Fluid Dynamics Research 53, no. 6 (December 1, 2021): 065503. http://dx.doi.org/10.1088/1873-7005/ac3b36.

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Abstract The aerodynamic characteristics of the two iced vertical circular cylinders in a tandem arrangement, due to the shape change by icing, are complex, and lack systematical investigation. Therefore, a set of wind tunnel tests were carried out to study the aerodynamic characteristics of the leeward vertical cylinder, with ice shape, icing thickness, cylinder spacing, and icing relative position of cylinders varied in the subcritical Reynolds number range in this study. Results show that the icing thicknesses had a greater impact on the lift coefficients of D-shaped ice leeward cylinder at the same angle of attack. The aerodynamic characteristics of the iced leeward cylinder were stable when the ratio (L/D) of cylinder spacing was within the range of 4.8–6.2. The change of flow field should be considered in the stability analysis of two circular vertical cylinders. The drag coefficients of the iced leeward cylinder varied significantly due to the shielding effects, especially within the range of 9° attack angle and L< 6.2D. The results of this work can provide an experimental reference for future research on wind resistance of two circular cylindrical structures in engineering practice.
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Weggel, D. C., J. M. Roesset, and M. H. Kim. "Second-Order Vertical Diffraction Forces on Truncated Cylinders." Journal of Offshore Mechanics and Arctic Engineering 118, no. 4 (November 1, 1996): 259–66. http://dx.doi.org/10.1115/1.2833914.

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A number of parametric studies were performed on a series of single, truncated cylinders in deep water using second-order potential theory. The cylinders were subjected to a monochromatic incident wave field. Second-order vertical diffraction force components were computed and plotted to illustrate their variation with cylinder aspect ratio and incident wave frequency. These plots make it possible to obtain rough estimates of vertical second-order diffraction force quantities on cylindrical components without having to perform second-order diffraction theory computations. The double-frequency heave response amplitude operator RAO(2) for a freely floating truncated cylinder is presented as a function of cylinder aspect ratio and incident wave frequency. Calculations of the RAO(2) were made using the total double-frequency diffraction force and the first-order radiation coefficients evaluated at the double-frequency.
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Kano, Stefania Carvalho, Gerson Bonfante, Raquel Hussne, and Aline F. Siqueira. "Use of base metal casting alloys for implant framework: marginal accuracy analysis." Journal of Applied Oral Science 12, no. 4 (December 2004): 337–43. http://dx.doi.org/10.1590/s1678-77572004000400016.

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The original protocol for implant prosthesis recommends the use of a gold framework for acrylic and ceramic prosthesis. However, due to its high cost, the use of alternative alloys is desired. This study compares the marginal accuracy of pre-made cylinders versus plastic cylinders cast with two different base metal casting alloys. Five samples each of (1) plastic cylinder cast in cobalt-chromium alloy, (2) plastic cylinder cast in nickel-chromium alloy, and (3) silver-palladium pre-made cylinder (control) were examined for marginal accuracy according to: (A) vertical gap; (B) horizontal gap and (C) horizontal gap depth at the abutment/cylinder interface. Data were submitted to statistical analysis (ANOVA and Student-Newman Keuls, p<0.05). Mean values for vertical, horizontal and gap depth were 4.13µm, 14.5µm and 6.93µm for pre-made cylinder, 23.18µm, 33.2µm and 88µm for Ni-Cr cast cylinder and 25.6µm, 51.8µm and 114.54µm for Co-Cr cast cylinder. No statistically significant differences were found between cast groups (1 and 2), but significant better fit was obtained with pre-made metal cylinders when compared to cast cylinders with Ni-Cr and Co-Cr alloys, for all analyses.
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Masuda, K., and T. Nagai. "Nonlinear Wave Forces on a Pair of Vertical Cylinders." Journal of Offshore Mechanics and Arctic Engineering 113, no. 1 (February 1, 1991): 1–8. http://dx.doi.org/10.1115/1.2919891.

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The present paper is concerned with development of a powerful scheme for calculating nonlinear wave forces on a pair of vertical cylinders with arbitrary cross sections. The Laguerre integration method is applied and its convergence is confirmed in the cases of a single vertical cylinder and a twin circular cylinder. Further, the present method is compared with the method given by Eatock-Taylor and Hung [9], and then the computational times and those properties for a numerical calculation are investigated. The numerical results for maximum wave forces on the vertical cylinders obtained by the present method are compared with the experimental results, so that the usefulness is clarified.
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Isaacson, Michael, Thomas Mathai, and Carol Mihelcic. "Hydrodynamic coefficients of a vertical circular cylinder." Canadian Journal of Civil Engineering 17, no. 3 (June 1, 1990): 302–10. http://dx.doi.org/10.1139/l90-037.

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The added mass and the damping coefficient of a large surface-piercing circular cylinder extending to the seabed and undergoing horizontal oscillations are described. A closed-form solution to the corresponding linear radiation problem is obtained by the use of eigenfunction expansions. Attention is given to the vertical distribution of these coefficients and to their high-frequency asymptotic behaviour. Comparisons are made with experimental measurements. The application to typical offshore structures is discussed. Key words: added mass, cylinders, damping, hydrodynamics, ocean engineering.
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Wang, Yin, Lingling Wang, Hai Zhu, Hongwu Tang, and Gang Wei. "A Numerical Study of the Forces on Two Tandem Cylinders Exerted by Internal Solitary Waves." Mathematical Problems in Engineering 2016 (2016): 1–15. http://dx.doi.org/10.1155/2016/9086246.

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A three-dimensional numerical wave flume is employed to investigate the forces exerted by internal solitary waves (ISWs) on a pair of circular cylinders in tandem arrangement, using large-eddy simulation (LES) model. The effect of the centre-to-centre distance (L) ranging from 1.5 to 5 diameters (D) is studied for various ISWs amplitudes (ηa) in the two-layer fluid system. Vertical-averaged vorticity distribution and vertical-averaged pressure gradient distribution in each layer are presented to investigate the different hydrodynamic interference between cylinders and the ISWs forces on each cylinder at variousL. Furthermore, the force behaviors of the two cylinders are also compared with that of an isolated cylinder in the same environment. The interaction between the two piles occurs in both layers, and it is found that, for1.5≤L/D<3.5, strong mutual interference appears between two cylinders; for3.5≤L/D<5, the two cylinders continue to influence each other in a weak-interference state; forL/D≥5, the interaction gradually decreases into a noninteracting state. This paper tries to provide some references to structural arrangement of double-cylinder structure and grouped-cylinder structure in stratified flow environment.
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Karim, F., B. Farouk, and I. Namer. "Natural Convection Heat Transfer From a Horizontal Cylinder Between Vertical Confining Adiabatic Walls." Journal of Heat Transfer 108, no. 2 (May 1, 1986): 291–98. http://dx.doi.org/10.1115/1.3246918.

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This paper reports an experimental study of natural convection heat transfer from a horizontal isothermal cylinder between vertical adiabatic walls. Some of the industrial applications of this problem are cooling and casing design of electronic equipment, nuclear reactor safety, and heat extraction from solar thermal storage devices. Heat transfer from 3.81 cm and 2.54 cm diameter cylinders was determined by measuring the electric power supplied to the heater, which was placed inside the cylinders, and correcting for radiation and end losses. Average Nusselt numbers were determined for a Rayleigh number range of 2 × 103 to 3 × 105 and wall spacing to cylinder diameter ratios of 1.5, 2, 3, 4, 6, 8, 10, 12, and ∞. It was found that the confinement of a heated horizontal cylinder by adiabatic walls enhances the heat transfer from the cylinder continuously. This effect is more pronounced at low Rayleigh numbers. A maximum relative enhancement of 45 percent was obtained over the range of experimental conditions studied. Schlieren and flow visualization studies were conducted at selected values of Rayleigh number and wall spacing to cylinder diameter ratios to further explain the heat transfer characteristics and the associated flow physics of the present problem.
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Al-Alusi, T. R., and D. J. Bushnell. "An Experimental Study of Free Convection Heat Transfer From an Array of Horizontal Cylinders Parallel to a Vertical Wall." Journal of Heat Transfer 114, no. 2 (May 1, 1992): 394–400. http://dx.doi.org/10.1115/1.2911287.

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An experimental investigation of heat transfer from an array of three horizontal cylinders aligned vertically parallel to a single wall is presented. Three different cylinder center-to-center spacings for the array cylinders were examined, CC= 1.5D, 2D, and 4D. The wall-array spacings were varied from 0.081D to infinity. The cylinders were placed in a still air medium at atmospheric pressure and maintained at constant heat flux. Modified Rayleigh number, based on the diameter of the cylinders, ranged from 6.2 × 104 to 1.2 × 106. Results indicate that heat transfer is generally enhanced, but for some wall spacing to cylinder configurations the heat transfer can be minimally decreased. For cases where the heat transfer was enhanced the top cylinder in the array was observed to have the highest enhancement (22 percent) and the lowest cylinder was enhanced the least (5 percent). Flow visualization studies showed that the wall generated a chimney effect between the wall and the cylinders.
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Dissertations / Theses on the topic "Vertical cylinder"

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Kaye, David. "Oscillation of a vertical cylinder in waves." Thesis, University of Cambridge, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.303115.

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Mihelcic, Carolin Susan. "Hydrodynamic force coefficients of a vertical circular cylinder." Thesis, University of British Columbia, 1989. http://hdl.handle.net/2429/27939.

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The problem addressed in this thesis is that of the behaviour of large offshore structures subjected to ice and earthquake loading. The theoretical formulation of the fluid force and associated added mass and damping coefficients acting on an isolated vertical surface-piercing rigid circular cylinder which is excited by sinusoidal unidirectional ground motions is presented. The closed-form solution is first developed on the basis of potential flow theory for arbitrary values of excitation frequency and, in addition, its asymptotic form for high frequencies is considered. The latter is found to be accurate in predicting the high-frequency added mass only for high structure radius-to-water depth ratios and the high-frequency damping for all radius-to-depth ratios. A computer method for numerical evaluation of the force coefficients is devised and theoretical results for different values of radius-to-depth ratios are thereby generated. An experimental study has been conducted in the Earthquake Engineering Laboratory of the Department of Civil Engineering at the University of British Columbia to verify the theoretical results obtained for the vertical distribution of the force coefficients of a model cylinder which satisfies the large body regime of fluid-structure behaviour for which effects due to fluid viscosity are negligible. Owing to unanticipated technical problems, the current study is unsuccessful and data recorded in the sinusoidal tests are unrealistic, although the calculated coefficients appear to be independent of base displacement (an observation which indicates that viscous effects were insignificant during testing). Nevertheless, values of total force coefficients which were obtained experimentally for a similar model in a previous investigation are found to agree very well with the corresponding theoretical results for frequencies of up to 6 Hz. It is concluded that the theoretical formulation provided for the hydrodynamic force coefficients of a vertical surface-piercing circular cylinder subjected to horizontal sinusoidal base motions of arbitrary frequency may be used to accurately predict the total added mass and damping of real structures satisfying the conditions imposed by the theory.
Applied Science, Faculty of
Civil Engineering, Department of
Graduate
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Ou, Zhiliang. "Numerical simulation of flow around vertical cylinders." University of Western Australia. School of Civil and Resource Engineering, 2007. http://theses.library.uwa.edu.au/adt-WU2007.0185.

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Local scour around bridge piers can cause serious damages and structural failure to the bridge. Correct prediction of the scour is an important criterion for the engineering design. Though the subject has been investigated for many decades, the theoretical developments have been very limited due to the complicated interaction of three-dimensional flow and the sediment transport. This thesis concerns the flow around a vertical bottom mounted cylinder exposed to currents and is considered as the initial phase of a study towards modeling local scour around vertical bottom-mounted structures. The aim of the present study is to obtain a better understanding of the complex three-dimensional flow and the mechanisms related to the scouring. The study started with the development of a three-dimensional numerical model to simulate flow around cylindrical structures. After validation of the model, the model was applied to investigate flow around an isolated rectangular cylinder. Unsteady flows around cylinders of a square cross section (A/D = 1) and a rectangular cross section (A/D = 2) were simulated to understand the flow properties around a cylinder other than a circular cross section. Three-dimensional flow patterns, pressure distribution, forces on the cylinder and vortex-shedding frequencies were discussed. It was found that the present numerical results generally agree well with the experimental data. Flow around a vertical cylinder mounted on a rigid bed was then investigated by the numerical model. A circular and a square cross sections were considered respectively. Flow structures of horseshoe vortex and the wake vortex which are the major mechanisms leading to the scouring around the base of the vertical cylinder were explored. The bed shear stress distributions that directly affect the scour processes were discussed. Finally the numerical model was applied to study the flow around a submerged square cylinder mounted on a bed, which has significant engineering relevance to the local scour around structures, such as bridge pier foundation itself, or a caisson placed underwater around the pier bottom for scour protection. The numerical calculations were carried out at different cylinder heights to investigate the effect of the cylinder height on the flow properties. It was found that for submerged cylinders with the height of less than one and a half of the cylinder side width the maximum bed shear stress amplification is about 60% of the value of an infinite long cylinder. The quantification of the shear stress reduction is important for scour protection design.
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Day, Jerod. "Laminar Natural Convection From Isothermal Vertical Cylinders." Thesis, University of North Texas, 2012. https://digital.library.unt.edu/ark:/67531/metadc177190/.

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Laminar natural convection heat transfer from the vertical surface of a cylinder is a classical subject, which has been studied extensively. Furthermore, this subject has generated some recent interest in the literature. In the present investigation, numerical experiments were performed to determine average Nusselt numbers for isothermal vertical cylinders (103 < RaL < 109, 0.5 < L/D <10, and Pr = 0.7) with and without an adiabatic top in a quiescent ambient environment which will allow for plume growth. Results were compared with commonly used correlations and new average Nusselt number correlations are presented. Furthermore, the limit for which the heat transfer results for a vertical flat plate may be used as an approximation for the heat transfer from a vertical cylinder was investigated.
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Cornett, Andrew Malcolm. "Short-crested wave forces on a rigid segmented vertical cylinder." Thesis, University of British Columbia, 1987. http://hdl.handle.net/2429/26688.

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This thesis investigates water particle kinematics and the wave forces exerted on a slender rigid vertical cylinder in regular bidirectional wave fields. The instrumented portion of this cylinder is partitioned into nine independent segments enabling measurement of the vertical profile of hydrodynamic loading both in-line and transverse to the direction of wave propagation. Experiments conducted at the Hydraulics Laboratory of the National Research Council in Ottawa are described and some results are compared with the predictions of a wave force model based on the Morison equation and linear fluid kinematics. The influence of the crossing angle between the two wave components on the forces experienced by the column is determined. These experiments consider short-crested wave behavior in intermediate and deep water resulting from the interaction of two identical regular wave trains crossing at angles of 30, 60 and 90 degrees. The limit corresponding to unidirectional monochromatic waves is also investigated to provide a reference condition for comparison with the short-crested results. Conditions at the location of maximum short-crested wave height are of primary interest, however, forces at locations between the anti-node and node of the flow are also examined. In all, water surface elevations, flow velocities, and wave forces were measured in 24 short-crested and 8 different long-crested wave conditions spanning the range of Keulegan-Carpenter number between 4 and 24. The results of this study confirm the findings of previous researchers that short -crested waves with a certain period travel faster and rise higher before breaking than do their long-crested counterparts, but that in-line wave forces are not necessarily increased. Lift force maxima equal to half the maximum in-line force were measured; these forces can contribute significantly to the magnitude and direction of the total force resultant.
Applied Science, Faculty of
Civil Engineering, Department of
Graduate
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Sabigoro, Rocky A. "Design and Manufacturing of Pneumatic Test Stand for Rod-less Cylinder vertical application." Thesis, Linköpings universitet, Fluida och mekatroniska system, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-105602.

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Within LiU Fluid laboratory there had been a number of hydraulic and pneumatic test stands for research projects and teaching. The effort was needed to do more extension within the field of pneumatics. This thesis was about designing, manufacturing, building and testing the Test Stand for vertical application of pneumatic rodless cylinder. It consisted of three main parts; mechanical structure, pneumatic system and electrical and electronics. The design part focused more on the mechanical structure and pneumatic system. Electrical and electronics had to be installed to facilitate actuation and control of the system after mechanical and pneumatic components were assembled together. The mechanical structure consisted of three main parts; cabinet, carriage and ball balancer. For each part three concepts were generated, evaluated and selected to obtain the most promising concept for further development. The design values were given such that the mechanical structure should have total weight not exceeding 500 kg. The pneumatic system would supply maximum pressure of 8 bar. Upstream pressure was considered to be 6 bar after 25% pressure drop assumed to occur in the system. The mass to be lifted was typically 26 kg moving at a maximum speed of 2 m/s. The whole design process was carried out with safety and design for assembly in mind. The methodologies applied in the design included; identification of need, concept generation, concept selection, CAD modeling and simulation and FE Analysis. Development of concepts involved CAD drawings (3D and 2D) in CATIA V5, calculations and selection of appropriate materials for each component. The pneumatic cylinder applied in this design was a rod-less cylinder (Bosch Rexroth; RTC-DA, MNR: R480628571) with a Piston diameter of 50 mm, stroke of 1.2 m and cushioning stroke of 20 mm. More design information on RTC-DA was not available therefore the information in appendix A was based on series RTC-BV which had close similarities with series RTC-DA. The carriage that moves up and down along the cylinder stroke was designed with a mechanism that imparted disturbance to the system. The mechanism could be set to impart either 100.7 N or 151.02 N disturbance. The design was done with the assumptions that:  Spring force Fs and extension x were constant  The system had sonic flow characteristics and critical flow appeared in meter out orifice.  The air was perfect gas which obeyed equation of state  Specific heat was constant  Viscosity was constant  Flow was one dimensional  System pressure drop was 25% of the maximum supply pressure. Dynamics of the system were estimated analytically and by means of simulation. Corresponding parameter values such as pressure, velocity, flow rate, cushioning stiffness, cushioning force and acceleration were obtained and compared. The product in general conformed to the specifications made prior to the design process.
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Bridenstine, Mark. "Convective heat transfer from a vertical cylinder in a high amplitude resonant sound field." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1996. http://handle.dtic.mil/100.2/ADA320233.

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Thesis (M.S. in Mechanical Engineering) Naval Postgraduate School, September 1996.
Thesis advisor(s): Ashok Gopinath. "September 1996." Includes bibliographical references (p. 95-96). Also available online.
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ANTOLLONI, GIULIA. "Dynamics induced by Steep Waves at a Vertical Slender Cylinder in Deep Waters: Laboratory Experiments." Doctoral thesis, Università Politecnica delle Marche, 2019. http://hdl.handle.net/11566/263694.

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In ambiente marino offshore, le onde ripide sono responsabili di episodi di danneggiamento delle strutture tanto quanto gli eventi più estremi. Un tipico fenomeno riconducibile alle onde ripide è il ringing, una risposta risonante ad alta frequenza che è stata spesso osservato in concomitanza alla presenza di un picco nella serie temporale del carico, denominato secondary load cycle (SLC), le cui cause devono essere ancora chiarite. In questa tesi, si presenta uno studio sperimentale volto all’analisi delle forze agenti, della separazione del flusso e della formazione di vortici a valle di un cilindro verticale snello, incernierato alla base, investito da onde ripide, frangenti e non, con lo scopo di chiarire la loro relazione. Si è utilizzata una innovativa e complessa configurazione di prova, che combina l’impiego di tecniche di misurazione ottica (Particle Image Velocimetry, PIV) per l’indagine del flusso a valle del cilindro su quattro piani orizzontali a diverse quote dal fondo alla registrazione sincronizzata di misure della forza agente sul cilindro e di elevazione dell’onda incidente. I risultati hanno mostrato che la separazione del flusso e la formazione di vortici si verifica per molte delle onde frangenti utilizzate e per le onde non frangenti, seppure in una forma completamente diversa. La generazione dei vortici è stata osservata subito dopo il passaggio della cresta dell’onda, a circa un quarto del periodo dell’onda, dove compare un secondo picco di carico, ovvero il SLC. La presenza del SLC è stata osservata per numeri di Froude Fr>0.6, lunghezza d’onda adimensionale kR≥0.1 e ripidità kη≥0.25, valori che ricadono all’interno dei range forniti da precedenti esperienze (Chaplin et al., 1997; Grue and Huseby, 2002; Suja-Thauvin et al., 2017; Riise et al., 2018). È stata trovata una correlazione tra la forza indotta dalla generazione dei vortici e il SLC, tuttavia la formazione dei vortici non può spiegare da sola il fenomeno. La dimensione massima dei vortici osservati è il (20-30)% del diametro del cilindro; questo risulta in disaccordo coi vortici di dimensione circa pari al diametro del cilindro osservati nelle simulazioni numeriche di Paulsen et al. (2014) e Kristiansen and Faltinsen (2017). Infine, la presenza del SLC è stata riscontrata con il ringing, indotto da effetti dovuti alla superficie libera ed alla separazione del flusso, secondo Riise et al. (2018).
Steep water waves may be responsible for damages to offshore structures, as inducing a high-frequency resonant response, commonly known as ringing, found to occur in conjunction with a peak in the load timeseries, named secondary load cycle (SLC), whose causes are still not properly known. In this thesis, an experimental study of the forces generated upon flow separation and vortex formation behind a bottom-hinged, vertical slender cylinder forced by steep waves, both breaking and non-breaking, is presented. An innovative and complex laboratory setup was arranged, this combining the use of optical measurement technique (Particle Image Velocimetry, PIV) for the investigation of the flow downstream the cylinder over four horizontal planes parallel to the bottom at different elevations with the recording of synchronized measurements both of the force acting on the cylinder and of the incoming wave elevation. PIV results showed the occurrence of flow separation and the formation of vortices for many of the breaking waves cases and for all the non-breaking waves, but with a completely different fashion. A correspondence between the SLC and the vortical structures has been found: vortex formation starts just after the wave crest has passed, at a stage corresponding to about one quarter of the wave period after the main load peak, where a second peak occurs i.e. secondary load cycle. The occurrence of a SLC has been identified by some synthetic parameters such as the Froude number Fr>0.6, the dimensionless wavenumber kR≥0.1 and the wave slope kη≥0.25, these falling within the range of limits provided by the experiences of Chaplin et al. (1997), Grue and Huseby (2002), Suja-Thauvin et al. (2017), Riise et al. (2018). A correlation between the vortex-shedding-induced force and the SLC was found, but such contribution is not the only one to the SLC. Generated vortices measure (20-30)% of the cylinder diameter at most, in disagreement with the larger size, about the cylinder diameter, of the vortices observed in the CFD simulations by Paulsen et al. (2014) and Kristiansen and Faltinsen (2017). The SLC occurrence is found to coincide with the ringing response, governed by free surface and flow separation effects, according with Riise et al. (2018).
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Salles, Rafael. "Experimental analysis of fluid-structure interaction phenomena on a vertical flexible cylinder: modal coeficients and parametric resonance." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/3/3152/tde-25082016-085120/.

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Oil and gas exploitation in deep waters has become more than just a profit business to be a daily necessity, since the world energy matrix is based on fossil components. Risers are offshore structures that are intimately linked with oil and gas exploitation and those are subjected to a great variety of effects in field, e.g., marine currents, Vortex Induced Vibration (VIV), heave motion caused by gravitational waves, non-linear contact with the sea floor, and many others. Riser dynamics is essentially non-linear and experimental tests in real scale are almost impossible due to a great variety of control parameters acting concomitantly. Small-scale models are a better experimental approach. Nevertheless, there are many structural and hydrodynamical parameters to be evaluated. Considering only vertical risers in the present work, Galerkin\'s modal decomposition is used in order to reduce the dynamics of a vertical flexible cylinder to a few linear modes in which the majority of energy and information are contained. From the modal analysis, added mass and structural parameters damping of a vertical flexible cylinder using data obtained from free-decay tests performed both in water and in air are evaluated. Finally, a modal Mathieu-Hill oscillator with non-linear damping is constructed and, based on aStrutt diagram, modal stability under parametric resonance is discussed.
Exploração de óleo e gás em bacias de águas profundas tem-se tornado mais do que apenas uma economia lucrativa, para ser uma necessidade diária, já que a matriz energética mundial está baseada em componentes fósseis. Risers são estruturas offshore ligadas intimamente com a exploração de óleo e gás e essas estão sujeitas a uma grande variedade de efeitos na operação, e.g., correntes marítimas, Vibrações Induzidas por Vórtices (VIV), movimento de heave causado por ondas gravitacionais, contato não-linear com o solo marinho, entre outros. Dinâmica de risers é essencialmente não-linear e testes experimentais em escala real são praticamente impossíveis devido a uma enorme variedade de parâmetros de controle agindo concomitantemente. Modelos em escala reduzida são uma abordagem experimental mais conveniente. Não obstante, há muitos parâmetros estruturais e hidrodinâmicos a serem determinados. Considerando apenas risers verticais no trabalho presente, a decomposição modal de Galerkin é usada a fim de reduzir a dinâmica de um cilindro fléxivel vertical a alguns modos lineares em que a maior parte da energia e informação estão contidos. A partir da análise modal, parâmetros de massa adicional e amortecimento estrutural de um cilindro flexível vertical são obtidos usando testes de decaimento livre conduzidos na água e no ar. Finalmente, um oscilador modal de Mathieu-Hill com amortecimento não-linear é proposto e, baseado em um diagrama de Strutt, a estabilidade modal sob excitação de ressonânica paramétrica é discutida.
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Auzerais, Anthony. "Impact d'un cylindre vertical sur la dynamique sédimentaire sous l'action d'un courant." Thesis, Normandie, 2017. http://www.theses.fr/2017NORMLH02/document.

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Les travaux portent sur l’étude de la formation de motifs sédimentaires à l’aval d’un cylindre vertical soumis à un courant. Le cylindre simule une fondation monopieu d’éolienne en mer, ou une pile de pont. Une modélisation théorique est développée. Les résultats obtenus sont en bon accord avec les résultats expérimentaux acquis au cours de la thèse. Une étude préliminaire expérimentale et théorique sur le tri sédimentaire au voisinage du cylindre est également effectuée
This work concerns the study of sediment patterns formation downstream a vertical cylinder under a steady current. The cylinder simulates an offshore monopile foundation, or a bridge pile. A theoretical modeling is developed. The results are in good agreement with the experimental results obtained in the framework of this PhD. An experimental and theoretical preliminary study on sediment segregation in the vicinity of the cylinder is also performed
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Books on the topic "Vertical cylinder"

1

Moberg, Göran. Wave forces on a vertical slender cylinder. Göteborg, Sweden: Dept. of Hydraulics, Chalmers University of Technology, 1988.

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2

Borthwick, A. G. L. Wave loading on a flexibly mounted small diameter vertical cylinder. Salford: University of Salford Department of Civil Engineering, 1986.

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Alan, Hill. Single cylinder vertical lever type winding engines as used in the north east of England. Eindhoven, Netherlands: Archaeologische Pers, 1986.

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4

Borthwick, A. G. L. Measurements of the wave-induced pressure profiles and corresponding fluid loading on a fixed vertical cylinder. Salford: University of Salford Department of Civil Engineering, 1988.

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5

Sajonia, Charles Blake. Random wave forces on a free-to-surge vertical cylinder. 1988.

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6

Chaplin, J. R., and T. P. Flintham. Breaking Wave Forces on a Vertical Cylinder (Offshore Technology Report). Health and Safety Executive (HSE), 1992.

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7

McCoy, Timothy J. Natural convection from a horizontal cylinder parallel to a heated vertical wall. 1987.

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Convective Heat Transfer from a Vertical Cylinder in a High Amplitude Resonant Sound Field. Storming Media, 1996.

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9

Kriebel, David Lane. A second-order diffraction theory for wave runup and wave forces on a vertical circular cylinder. 1987.

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10

Seubert, David, Harold M. Barnes, and Victor Girard. Vertical-Cut Cylinders and Discs: A Catalogue of All Hill-&-Dale Recordings of Serious Worth Made and Issued Between C.1897-1932. American Discography Project, 2022.

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Book chapters on the topic "Vertical cylinder"

1

Donley, M. G., and P. D. Spanos. "Potential Wave Forces on a Moored Vertical Cylinder." In Lecture Notes in Engineering, 58–94. Berlin, Heidelberg: Springer Berlin Heidelberg, 1990. http://dx.doi.org/10.1007/978-3-642-46715-8_4.

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Newman, J. N. "Nonlinear Scattering of Long Waves by a Vertical Cylinder." In Waves and Nonlinear Processes in Hydrodynamics, 91–102. Dordrecht: Springer Netherlands, 1996. http://dx.doi.org/10.1007/978-94-009-0253-4_8.

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Sun, L., Z. Zong, and G. H. Dong. "Action of Ship Waves on a Verticial Cylinder in front of a Vertical Wall." In New Trends in Fluid Mechanics Research, 377. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-75995-9_116.

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Mai, Tri. "Experimental Investigation of Wave Scattering Around a Large Vertical Circular Cylinder." In Lecture Notes in Civil Engineering, 286–93. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-7735-9_31.

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Dey, Debasish, Ashim Jyoti Baruah, and Rupjyoti Borah. "Memory Fluid Flow Past a Vertical Circular Cylinder and Its Energy Transfer." In Advances in Intelligent Systems and Computing, 85–93. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-15-9927-9_9.

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Marinca, Vasile, Nicolae Herisanu, and Bogdan Marinca. "Thin Film Flow of a Fourth Grade Fluid Down a Vertical Cylinder." In Optimal Auxiliary Functions Method for Nonlinear Dynamical Systems, 211–21. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-75653-6_21.

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Kuznetsov, Nikolay G., and Oleg V. Motygin. "Sloshing in a Vertical Cylinder in the Presence of a Porous Layer." In Mechanics and Control of Solids and Structures, 375–85. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-93076-9_19.

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Klopman, Gert, and Jan K. Kostense. "The Loading on a Vertical Cylinder in Random Waves at High Reynolds Numbers." In Water Wave Kinematics, 679–99. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-0531-3_47.

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Rana, Basanta Kumar, and Jnana Ranjan Senapati. "Laminar Mixed Convection Over a Rotating Vertical Hollow Cylinder Exposed in the Air Medium." In Lecture Notes in Mechanical Engineering, 375–85. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-7831-1_34.

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Huang, H., Q. Y. Zhu, and J. Fu. "Discussion of the Problems of Nonlinear Water Wave Diffraction around Porous Vertical Circular Cylinder." In New Trends in Fluid Mechanics Research, 510–13. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-75995-9_170.

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Conference papers on the topic "Vertical cylinder"

1

Potts, Douglas A., Jonathan R. Binns, Hayden Marcollo, and Andrew E. Potts. "Hydrodynamics of Towed Vertical Surface-Piercing Cylinders." In ASME 2019 38th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/omae2019-95109.

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Abstract This project investigates a cantilevered cylinder projecting down into the water column moving at high velocity through still water, as is applicable to submarine masts. Surface-piercing cylinders differ from fully submerged cylinders due to the generation of surface wakes and under increasing flow speeds the formation of a ventilated pocket in the lee of the cylinder, both of which grow with increasing velocity, with concomitant effects on the hydrodynamic loading. The relative length of submergence, or immersed aspect ratio (L/D) and end conditions of the cylinder with respect to tip vortex drag effects may also impact the hydrodynamic loads and wake formation. Laboratory testing of surface-piercing cylinders to date has predominantly been confined to characterising the wakes shed from a rigid cylinder cantilevered down into the water from a towing tank carriage, which under certain test conditions will also exhibit significant Vortex-Induced-Vibration (VIV), though not adequately identified and accounted for in its magnification of drag and wake.
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Kriebel, David L. "Nonlinear Diffraction by a Vertical Cylinder." In 21st International Conference on Coastal Engineering. New York, NY: American Society of Civil Engineers, 1989. http://dx.doi.org/10.1061/9780872626874.002.

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Olsen, Robert, and Shan Huang. "Wave Induced Hydrodynamic Forces on Vertical Piggyback Risers." In ASME 2002 21st International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2002. http://dx.doi.org/10.1115/omae2002-28043.

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The wave induced hydrodynamic forces on a pair of vertical cylinders of different diameters in close proximity are investigated experimentally. The smaller cylinder is placed at various positions around the larger one. The wave forces, including both drag and lift, are measured on each cylinder independently at two different depths below the mean water level for each cylinder. The Keulegan-Carpenter numbers vary from 0.4 to 14 based upon the larger cylinder diameter and the Reynolds numbers are in the sub-critical regime. It is found that there is significant interference effect upon the cylinder drag and inertia coefficients.
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Kalendar, Abdulrahim, Patrick H. Oosthuizen, and Abdulrahman Alhadhrami. "Experimental Study of Natural Convective Heat Transfer From an Inclined Isothermal Square Cylinder With an Exposed Top Surface Mounted on a Flat Adiabatic Base." In 2010 14th International Heat Transfer Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/ihtc14-22846.

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Natural convective heat transfer rates from inclined cylinders with a square cross-section and which has an exposed top surface have been experimentally studied. When relatively small square cylinders with exposed top surfaces inclined at an angle to the vertical are used, the inclination angle to the vertical has, in general, a considerable effect on the magnitude of the mean heat transfer rate and on the nature of the flow over the surfaces that make up the cylinder. In the situation here considered the cylinder is mounted on a large flat essentially adiabatic surface with the other cylinder surfaces exposed to the surrounding air and with the cylinder, in general, inclined to the vertical at angles between vertically upwards and vertically downwards. The situation considered is an approximate model of that which occurs in some electrical and electronic component cooling problems. The cross-sectional size-to-height ratio of the square cylinders used in the present study was comparatively small, i.e. the square cylinders were short, the width, w, of the square cylinders being 25.4 mm and the width-to-height ratios of between 1 and 0.25 being used. One of the main aims of the present work was to determine how the cross-sectional size-to-height ratio of the square cylinder, i.e., w/h, influences the mean heat transfer rate from the cylinder at various angles of inclination between vertically upwards and vertically downwards. The heat transfer rates were determined by the transient method, this basically involving heating the model and then measuring its temperature-time variation while it cooled, the tests being carried out inside a large enclosure. Tests were carried out in air with all models at various angles of inclination to the vertical between vertically upwards and vertically downwards. The effects of w/h, Rayleigh number, Ra, and angle of inclination, φ, on the mean Nusselt number, Nu for the entire cylinder have thus been studied. The Rayleigh number, Ra, based on the cylinder height, h, was between approximately 1E4 and 5E6. The experimental results have been compared with the results obtained in an earlier numerical study.
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Sridharan, Prashanth, Antonio Ramos Archibold, Muhammad M. Rahman, D. Yogi Goswami, and Elias L. Stefanakos. "Melting in Vertical Cylinders During Thermal Energy Storage." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-64820.

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The present study numerically investigates the process of melting in a hollow vertical cylinder, filled with a phase change material (PCM). The PCM used is sodium nitrate, which expands upon melting. Therefore, the cylindrical shell is partially filled with the PCM and the remaining volume is occupied by air. The influence of cylinder shape on the melting and heat transfer rate is analyzed. The numerical model takes both conductive and convective heat transfer into account during the melting process. For the problem being considered here, the dimensionless numbers that characterized the process are the Grashof, Stefan, and Prandtl numbers. The Aspect Ratio (AR) is used to characterize the shape of the cylinder, which is defined as the ratio of the height to the diameter of the cylinder. In this study, a range of AR values from 0.25 to 10 are investigated. Cylinders with small AR, corresponding to high Grashof numbers, lead to lower melting times compared with cylinders with high AR. The partially melted PCM shape differed between the high and low AR cases. The molten PCM stream function was also influenced greatly by the variation in solid PCM shape.
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Zhong, Qian, and Ronald W. Yeung. "Wave-Body Interactions Among an Array of Truncated Vertical Cylinders." In ASME 2016 35th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/omae2016-55055.

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A semi-analytical method is developed to investigate water-wave radiation and diffraction by an array of truncated vertical cylinders as a model for a point-absorber wave farm. Each cylinder can have independent movements in six modes. The method of matched eigenfunction expansions is applied to obtain the velocity potential for the fluid. To achieve fast computation, the effects of evanescent modes of locally scattered waves from one cylinder are neglected in the near fields of the neighboring cylinders. Wave-exciting forces and moments on an individual cylinder or a group of cylinders, situated among an array, are evaluated by a new, generalized form of Haskind relation that is applicable to an array configuration. In results, hydrodynamic coefficients and wave-exciting loads are presented for arrays of different configurations. Comparisons between wave-exciting loads obtained from the generalized Haskind relation and those from direct diffraction solutions show excellent agreements.
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Wang, J., S. M. Calisal, and W. Qiu. "Interactions Between Vertical Structures in Waves." In ASME 2005 24th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2005. http://dx.doi.org/10.1115/omae2005-67539.

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This paper presents experimental and theoretical results obtained during the hydrodynamic study of a multi-cylinder system. The main focus of the study was to quantify hydrodynamic interactions between heaving vertical cylinders of a conceptual wave energy conversion system. Several identical circular cylinders representing platforms in an energy conversion system and a parabolic shaped wave reflector were tested in a wave flume tank. Wave heaving forces, radiation and diffraction effects were studied experimentally and numerically. The theoretical calculations were carried out for hydrodynamic coefficients, the radiation and diffraction effect analysis. Experimental results for multi-cylinders were compared with the numerical solutions by a panel-free method in the frequency domain. One main objective of the experimental tests was to calibrate the experimental set up, obtain validation data for numerical calculations. The diffraction studies showed that the hydrodynamic interactions could be constructive or destructive for heave wave forces. The positive magnification of the wave exciting force can be significant if a parabolic shaped reflector is used. It was observed that the wave force magnification and the wave energy absorption depend on incoming wavelength, and the cylinder to wavelength ratio. It has been found in the radiation tests that heave added mass and damping coefficients compare well with the calculations based on potential flow calculations.
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8

Clark, M. C., J. C. Stewart, and S. Gir. "Natural Convection From Vertically Stacked Inclined Cylinders." In ASME 1998 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/imece1998-0579.

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Abstract While there are published correlations dealing with average natural convection coefficients from a single horizontal, vertical, or inclined cylinder, there do not appear to be any for vertically stacked inclined cylinders. This study investigates natural convection from parallel inclined cylinders spaced two diameters apart in a low Rayleigh number range and Nusselt-Rayleigh number correlations are presented for this case. Convection coefficients generally decreased for both rods as the angle of inclination increased (from horizontal to vertical) and were consistently higher for the bottom rod in all configurations except vertical. Convection from the top cylinder appears to be impaired at this close spacing. Comparisons of the data to modified versions of various horizontal and one inclined cylinder formulation show that while predicted Nusselt numbers have similar trends, no single equation is a good predictor for both rods in this Rayleigh number range.
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9

Rani, H. P. "Unsteady Natural Convection Micropolar Flow over Vertical Cylinder." In NUMERICAL ANALYSIS AND APPLIED MATHEMATICS: International Conference on Numerical Analysis and Applied Mathematics 2008. American Institute of Physics, 2008. http://dx.doi.org/10.1063/1.2991059.

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Chakrabarti, S. K., A. R. Libby, and D. J. Kompare. "Dynamic Pressures Around A Vertical Cylinder In Waves." In Offshore Technology Conference. Offshore Technology Conference, 1986. http://dx.doi.org/10.4043/5102-ms.

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Reports on the topic "Vertical cylinder"

1

O`Brien, J. E. Emissivity measurements in support of experiments on natural convection between a vertical cylinder and a surrounding array. Office of Scientific and Technical Information (OSTI), December 1991. http://dx.doi.org/10.2172/10138388.

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O'Brien, J. E. Emissivity measurements in support of experiments on natural convection between a vertical cylinder and a surrounding array. Office of Scientific and Technical Information (OSTI), December 1991. http://dx.doi.org/10.2172/5534496.

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