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Journal articles on the topic 'Non-circular tube'

Author: Grafiati

Published: 3 June 2025

Last updated: 19 July 2025

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1

Deeb, R., D. V. Sidenkov, and V. I. Salokhin. "Numerical Investigation of Thermal-Hydraulic Performance of Circular and Non-Circular Tubesin Cross-Flow." Herald of the Bauman Moscow State Technical University. Series Natural Sciences, no. 2 (95) (April 2021): 102–17. http://dx.doi.org/10.18698/1812-3368-2021-2-102-117.

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A numerical study has been conducted to clarify flow and heat transfer characteristics around circular, cam, and drop-shaped tubes using the software package ANSYS FLUENT. Reynolds number Re based on equivalent circular tube is varied in range of (8.1--19.2)·103. All tube shapes are investigated under similar operating conditions. Local heat transfer, pressure and friction coefficients over a surface of the tubes were presented. Obtained results agree well with those available in the literature. Correlations of the average Nusselt number Nuav and a friction factor f in terms of Reynolds number

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2

Deeb, R., and D. V. Sidenkov. "Numerical analysis of heat transfer and fluid flow around circular and non-circular tubes." Journal of Physics: Conference Series 2088, no. 1 (2021): 012008. http://dx.doi.org/10.1088/1742-6596/2088/1/012008.

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Abstract A two-dimensional study of turbulent flow and heat transfer in a channel with circular and non-circular tubes has been carried out using the CFD Fluent software package. Four non-circular tubes were investigated: flat, ellipse, cam, and drop-shaped. Reynolds number varied in the range of 7300 ≤ Re ≤ 14600. All tubes were investigated under similar operating conditions. Local heat transfer, pressure, and friction coefficients over a surface of the tubes were presented. The thermal-hydraulic performance was used to estimate the efficiency of the non-circular tubes. The results indicated

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3

Gomez-Constante, Juan P., and Kumbakonam R. Rajagopal. "Flow of a new class of non-Newtonian fluids in tubes of non-circular cross-sections." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 377, no. 2144 (2019): 20180069. http://dx.doi.org/10.1098/rsta.2018.0069.

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Fluids described by constitutive relations wherein the symmetric part of the velocity gradient is a function of the stress can be used to describe the flows of colloids and suspensions. In this paper, we consider the flow of a fluid obeying such a constitutive relation in a tube of elliptic and other non-circular cross-sections with the view towards determining the velocity field and the stresses that are generated at the boundary of the tube. As tubes are rarely perfectly circular, it is worthwhile to study the structure of the velocity field and the stresses in tubes of non-circular cross-se

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4

Stennei, M., T. Clausmeyer, J. Grodotzki, S. Rosenthal, M. Stiglmair, and A. E. Tekkaya. "Prediction strategy for the forming and stuffing of non-circular tube." IOP Conference Series: Materials Science and Engineering 1284, no. 1 (2023): 012084. http://dx.doi.org/10.1088/1757-899x/1284/1/012084.

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Abstract The manufacturing of exhaust filter systems for cars typically comprises the forming of a tube and the later stuffing of the formed product with a ceramic monolith and an elastomer mat for filtration. It is shown, that for oval tubes the stuffing process leads to inhomogeneous deformation of the final product wherefore it must be considered when designing the tools for the forming step. The high number of iterations for the tool design can hence be reduced. Additionally, under certain conditions, the necessity of simulating the forming process is shown to no longer be given. The reaso

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5

Djamaluddin, Fauzan. "Optimization of Foam Filled Door Sill for Pure Electric Vehicle." International Journal of Mechanics 17 (March 13, 2023): 31–37. http://dx.doi.org/10.46300/9104.2023.17.5.

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In this work, the optimization values for several double circular tubes filled with foam under dynamic bending loading are compared. The thin-walled tube is frequently used in vehicle construction, especially on the door sill, to reduce impact. Double circular tubes made of the aluminum alloy AA6063 T6 were filled with foam for this numerical study. Structures are modeled and analyzed using the ABAQUS algorithm. Optimization of tubes determined using Non-Dominated Sorting Genetic Algorithm version II (NSGA II). Excellent agreement between the results of the simulation and the empirically valid

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6

Morris, Edmund, A. G. Olabi, and M. S. J. Hashmi. "Lateral crushing of circular and non-circular tube systems under quasi-static conditions." Journal of Materials Processing Technology 191, no. 1-3 (2007): 132–35. http://dx.doi.org/10.1016/j.jmatprotec.2007.03.006.

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7

Dong, Shi Min, Wan Sheng Zhang, Guo Hong Chai, Ming Ming Xing, and Hong Zhang. "Simulating Research on Rod String’s Gyro Effect Caused by Eccentric Rotation in Circular Tube." Applied Mechanics and Materials 130-134 (October 2011): 2294–300. http://dx.doi.org/10.4028/www.scientific.net/amm.130-134.2294.

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Based on the influences of eccentrical rotating inertial centrifugal force and axial force on the rod string’s lateral bending deformation, the finite beam element model of rod string’s bending deformation is established. The constraint to rod string’s bending deflection exerted by inwall of circular tube and the distinction of the constraint to rod string’s deflection because of the different gaps between rod string to circular tube and coupling to circular tube are both taken into account. Meanwhile, removable spring elements with two directions are adopted, by which the non-linear contact p

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8

Manigandan, R., and Manoj Kumar. "Non-linear Analysis of Axially Loaded Octagonal CFDST Short Columns." Proceedings of the 12th Structural Engineering Convention, SEC 2022: Themes 1-2 1, no. 1 (2022): 435–42. http://dx.doi.org/10.38208/acp.v1.532.

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Concrete Filled Double-skin Steel Tube (CFDST) is a form of composite column that consists of outer steel and an inner steel tube and the space between them is filled with concrete. The structural response of CFDST columns is significantly affected by the thickness of outer and inner steel tubes and the compressive strength of infilled concrete. Although many studies have been in the past to understand the effect of inner and outer tubes thickness on the axial compressive response of circular CFDST columns, no such study appears in the context of octagonal CFDST columns. In this paper, the thi

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9

MANNING, ROBERT, STEVEN COLLICOTT, and ROBERT FINN. "Occlusion criteria in tubes under transverse body forces." Journal of Fluid Mechanics 682 (July 13, 2011): 397–414. http://dx.doi.org/10.1017/jfm.2011.230.

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When a fluid in a tube is occluded, one finds a static configuration in which the occluding free surface of the fluid is an equilibrium capillary surface spanning the tube. We extend known criteria for existence and non-existence of such a surface, leading to an explicit mathematically rigorous occlusion criterion for cylindrical tubes in a transverse body force field, depending on the force magnitude and contact angle. For any contact angle γ ≠ π/2, we provide further an explicit design of a tube section, which will not occlude in a downward gravity field, regardless of the field strength. In

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10

Shakeri, M., R. Mirzaeifar, and S. Salehghaffari. "New insights into the collapsing of cylindrical thin-walled tubes under axial impact load." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 221, no. 8 (2007): 869–85. http://dx.doi.org/10.1243/09544062jmes562.

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The current paper presents further investigations into the crushing behaviour of circular aluminium tubes subjected to axial impact load. Experiments prove that in order to achieve the real collapsing shape of tubes under axial loads in numerical simulations, an initial geometric imperfection corresponding to the plastic buckling modes should be introduced on the tube geometry before the impact event. In this study, it is shown that the collapsing shape of tube is affected by this initial imperfection and consequently it is shown that by applying an initial geometric imperfection similar to th

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11

Bauer, H. F. "Non-isothermal masstransport in a circular tube for flow of Non-Newtonian liquid." Wärme- und Stoffübertragung 20, no. 2 (1986): 167–76. http://dx.doi.org/10.1007/bf01008816.

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12

Isaac, Chukwuemeke William. "Crushing response of circular thin-walled tube with non-propagating crack subjected to dynamic oblique impact loading." International Journal of Protective Structures 11, no. 1 (2019): 41–68. http://dx.doi.org/10.1177/2041419619849087.

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The dynamic oblique crushing of circular thin-walled tubes with the presence of non-propagating crack was investigated numerically. The material considered was strain rate sensitive with crack located at the distal end of the tube. Major crashworthiness parameters were obtained and the analysis of the structural response for idealized and finite element crushed thin-walled tubes was also carried out. The study shows that crack initiation on energy absorbing tubes increase their crushing force efficiency under oblique impact, decrease their crushing force efficiency under axial impact and reduc

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13

Huang, Wen Juan, Chun Hua Lu, Wei Min Tan, Yan Zhang та Zhong Zi Xu. "Research on the 1.06 μm Reflectivity of Subwavelength Surface-Relief Structure via Finite Different Time Domain Method". Advanced Materials Research 79-82 (серпень 2009): 1679–82. http://dx.doi.org/10.4028/www.scientific.net/amr.79-82.1679.

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In this paper, setting 1.06 μm Gaussian modulated pulse electromagnetic wave as irradiation sources, the influences of structural parameters on reflectivity are analyzed by finite different time domain (FDTD) method. The results show that the filled factor and height are key factors for circular tube relief structure with non absorption. The optimal height could be set to 0.2 μm, which is one odd time of the ratio of incident wavelength λ and four equivalent refractive index 4N, then the best filled factor is between 0.7 and 0.9, the ratio of inner and outer diameter could be set between 0.4 a

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14

Muzychka, Y. S., and M. M. Yovanovich. "Laminar Forced Convection Heat Transfer in the Combined Entry Region of Non-Circular Ducts." Journal of Heat Transfer 126, no. 1 (2004): 54–61. http://dx.doi.org/10.1115/1.1643752.

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A new model for predicting Nusselt numbers in the combined entrance region of non-circular ducts and channels is developed. This model predicts both local and average Nusselt numbers and is valid for both isothermal and isoflux boundary conditions. The model is developed using the asymptotic results for convection from a flat plate, thermally developing flows in non-circular ducts, and fully developed flow in non-circular ducts. Through the use of a novel characteristic length scale, the square root of cross-sectional area, the effect of duct shape on Nusselt number is minimized. Comparisons a

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15

Gutierrez, J. A., A. A. Mendiburu, I. Ávila, and Edgar Paz Peréz. "VELOCITY PROFILE MODELING FOR NON-ISOTHERMAL FLOWS INSIDE A CIRCULAR TUBE." Revista de Engenharia Térmica 16, no. 2 (2017): 87. http://dx.doi.org/10.5380/reterm.v16i2.62218.

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This research proposes a new method to establish the velocity field and the dimensionless velocity profile for Newtonian and non-Newtonian flows inside a circular tube. Several studies developed regarding different fluid types (such as potency law fluid, Bingham and Herschel-Bulkley, among others) observed that a rational or irrational polynomial was used for the dependent velocity field variable. Thus, a rational polynomial was established as a starting point for this research as the dependent velocity field variable. Dimensionless velocity profiles obtained from the proposed fluid-dynamics m

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16

Hojjat, Mohammad, Seyed Gholamreza Etemad, and Rohollah Bagheri. "Laminar heat transfer of non-Newtonian nanofluids in a circular tube." Korean Journal of Chemical Engineering 27, no. 5 (2010): 1391–96. http://dx.doi.org/10.1007/s11814-010-0250-3.

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17

Sandall, O. C., O. T. Hanna, and K. Amarnath. "Experiments on turbulent non-newtonian mass transfer in a circular tube." AIChE Journal 32, no. 12 (1986): 2095–98. http://dx.doi.org/10.1002/aic.690321222.

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18

QUAN, G. Z., J. ZHOU, Z. X. MEN, and Y. TONG. "A STUDY ON NON-MANDREL DRAWING PROCESS OF A RECTANGULAR TUBE FROM CIRCULAR CROSS-SECTION." Journal of Advanced Manufacturing Systems 07, no. 01 (2008): 45–49. http://dx.doi.org/10.1142/s0219686708001036.

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Non-mandrel drawing process is available for producing aluminum tube with rectangular cross-section. The corresponding dynamics and finite element models were developed based on FEM software during the investigation. The influence curve of different semi-die angle on drawing load was achieved, and a proper value a2 = 11° was found. When tube blank instability occurred during drawing, the stress along the section profile increased substantially. Thus the drawing die sizing section got optimized with β = 178° to prevent blank instability. Then the touch-stress distribution of three key points wa

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19

Ting, Hsien-Hung, and Shuhn-Shyurng Hou. "Numerical investigation of CuO-water nanofluid turbulent convective heat transfer in square cross-section duct under constant heat flux." Engineering Computations 33, no. 6 (2016): 1714–28. http://dx.doi.org/10.1108/ec-08-2015-0261.

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Purpose – The purpose of this paper is to numerically investigate the convective heat transfer of water-based CuO nanofluids flowing through a square cross-section duct under constant heat flux in the turbulent flow regime. Design/methodology/approach – The numerical simulation is carried out at various Peclet numbers and particle concentrations (0.1, 0.2, 0.5, and 0.8 vol%). The finite volume formulation is used with the semi-implicit method for pressure-linked equations algorithm to solve the discretized equations derived from the partial nonlinear differential equations of the mathematical

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20

Valerii, Kuznetsov. "Justification of efficiency of plain shaped heat exchange surfaces to increase the compactness of power plants." Eastern-European Journal of Enterprise Technologies 6, no. 8 (108) (2020): 17–24. https://doi.org/10.15587/1729-4061.2020.214829.

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Substantiation of using non-circular plain shaped surfaces to increase the compactness of power plants is presented. The criterion of thermohydraulic compactness is justified, which takes into account the layout and arrangement of heat transfer elements and their thermohydraulic efficiency. To simulate heat movement and transfer processes in elements of power plants, the computational fluid dynamics method is used. Verification is carried out with available literature data, the discrepancy of results does not exceed 2.4 %. For single elliptical and plane-oval shapes, there is a local maxi

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21

Lee, Han Chang, Jinhyuk Jeong, Seunggi Jo, Dong Yun Choi, Gyu Man Kim, and Woojin Kim. "Development of a Subpath Extrusion Tip and Die for Peripheral Inserted Central Catheter Shaft with Multi Lumen." Polymers 13, no. 8 (2021): 1308. http://dx.doi.org/10.3390/polym13081308.

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The tip and die for manufacturing multi-lumen catheter tubes should be designed considering the flow velocity of the molten polymer and the deformation of the final extruded tube. In this study, to manufacture non-circular double-lumen tubes for peripherally inserted central catheters (PICCs), three types of tip and die structures are proposed. The velocity field and swelling effect when the circular tip and die (CTD) are applied, which is the commonly used tip and die structure, are analyzed through numerical calculation. To resolve the wall and rib thickness and ovality issues, the ellipse t

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22

Hojjat, M., S. Gh Etemad, R. Bagheri, and J. Thibault. "Pressure Drop of Non-Newtonian Nanofluids Flowing Through a Horizontal Circular Tube." Journal of Dispersion Science and Technology 33, no. 7 (2012): 1066–70. http://dx.doi.org/10.1080/01932691.2011.599216.

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23

Simakov, Sergey S. "Spatially averaged haemodynamic models for different parts of cardiovascular system." Russian Journal of Numerical Analysis and Mathematical Modelling 35, no. 5 (2020): 285–94. http://dx.doi.org/10.1515/rnam-2020-0024.

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AbstractThis paper revisits the usage of spatially averaged haemodynamic models such as non-stationary 1D/0D in space and stationary 0D in space models. Conditions of equivalence between different 1D model formulations are considered. The impact of circular and elliptic shapes of the tube cross-section on the friction term and the tube law is analyzed. Finally, the relationship between 0D lumped and 1D models is revealed.

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24

MR.K.SURESH, KUMAR, and SURESH SRI.O. "BUCKLING ANALYSIS OF CONCRETE FILLED STEEL TUBE COLUMNS." IJIERT - International Journal of Innovations in Engineering Research and Technology 5, no. 2 (2018): 55–59. https://doi.org/10.5281/zenodo.1454503.

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<strong>The use of CFST in building construction has increased sig nificantly in the recent years mainly due to its simple construction sequence and superior structural perform ance. Therefore,it is necessary to understand their behavior as structural member. Extensive experiment al studies about concrete filled steel tubes (CFSTS) have been conducted in past. However experimental results are not sufficient to support the engineering of these components. Advanced numerical technique s are required to simulate their behavior to extend the experimental research and develop predictive tool s requ

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25

Avalle, M., and L. Goglio. "Static lateral compression of aluminium tubes: Strain gauge measurements and discussion of theoretical models." Journal of Strain Analysis for Engineering Design 32, no. 5 (1997): 335–43. http://dx.doi.org/10.1243/0309324971513454.

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This paper illustrates experimental results obtained by means of strain gauges applied on circular tubes during static lateral crushing. The aim of the work is to obtain an experimental insight regarding the strain field during lateral compression and to verify the known theoretical models. The experimental activity involved aluminium tubes of 80 and 100 mm diameter and 2 mm wall thickness. Up to thirty strain gauges were applied on the internal and external surfaces of each tube. Additional theoretical results were obtained by means of numerical simulation performed using a non-linear finite

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26

Lin, Yan-Ting, and Sheng-An Yang. "Turbulent Film Condensation on a Nonisothermal Horizontal Tube." Journal of Mechanics 21, no. 4 (2005): 235–42. http://dx.doi.org/10.1017/s1727719100000678.

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AbstractA simple model has been developed for the study of turbulent film condensation from downward flowing vapors onto a horizontal circular tube with variable wall temperature. The interfacial shear at the vapor condensate film is evaluated with the help of Colburn analogy. The condensate film flow and local/or mean heat transfer characteristics from a horizontal tube with non-uniform temperature variation under the effect of Froude number, sub-cooling parameter and system pressure parameter has been conducted. Although the non-uniform wall temperature variation has an appreciable influence

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27

Hojjat, M., S. Gh Etemad, R. Bagheri, and J. Thibault. "Convective heat transfer of non-Newtonian nanofluids through a uniformly heated circular tube." International Journal of Thermal Sciences 50, no. 4 (2011): 525–31. http://dx.doi.org/10.1016/j.ijthermalsci.2010.11.006.

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28

Guzmán, J. E. V., I. Hernández-Arrieta, W. Vicente, M. Salinas-Vazquez, and E. Martínez-Espinosa. "Non-local entropy evolution in heat exchangers with elliptical and circular tube geometries." International Journal of Thermal Sciences 134 (December 2018): 601–11. http://dx.doi.org/10.1016/j.ijthermalsci.2018.08.041.

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29

Tsai, J. R., and M. N. Özisik. "Radiation and laminar forced convection of non-Newtonian fluid in a circular tube." International Journal of Heat and Fluid Flow 10, no. 4 (1989): 361–65. http://dx.doi.org/10.1016/0142-727x(89)90027-1.

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30

Piscesa, Bambang, Mario M. Attard, Dwi Prasetya, and Priyo Suprobo. "Finite element analysis of the Circular Double Skin Tubular Concrete (DSTC) under concentric loading." MATEC Web of Conferences 276 (2019): 01009. http://dx.doi.org/10.1051/matecconf/201927601009.

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This paper presents a numerical investigation on the behaviour of circular double-skin tubular concrete (DSTC) under concentric loading. The numerical analysis is carried out using a three-dimensional non-linear finite element package (3D-NLFEA). In DSTC specimen, the concrete is enclosed by FRP wraps at the outer tube and circular hollow steel (CHS) at the inner tube. The concrete constitutive model is based on the authors developed plasticity-fracture model which uses a non-constant plastic dilation rate for modelling concrete dilation under compression. The nonlinear buckling analysis is in

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31

Matsushita, Yosuke, Hironobu Yanagisawa, and Teruo Sano. "Vertical and Horizontal Transmission of Pospiviroids." Viruses 10, no. 12 (2018): 706. http://dx.doi.org/10.3390/v10120706.

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Viroids are highly structured, single-stranded, non-protein-coding circular RNA pathogens. Some viroids are vertically transmitted through both viroid-infected ovule and pollen. For example, potato spindle tuber viroid, a species that belongs to Pospiviroidae family, is delivered to the embryo through the ovule or pollen during the development of reproductive tissues before embryogenesis. In addition, some of Pospiviroidae are also horizontally transmitted by pollen. Tomato planta macho viroid in pollen infects to the ovary from pollen tube during pollen tube elongation and eventually causes s

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32

Khalaf, Manahel Shahath, Amer M. Ibrahim, Hadee Mohammed Najm, et al. "Evaluation and Prediction of the Bending Behavior of Circular Hollow Steel Tube Sections Using Finite Element Analysis." Materials 15, no. 11 (2022): 3919. http://dx.doi.org/10.3390/ma15113919.

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Circular hollow steel tube columns are widely used in high-rise buildings and bridges due to their ductility and lower weight compared to reinforced concrete. The use of this type of steel section has several advantages over using reinforced concrete members. The present study investigates the bending behavior of steel circular hollow sections when subjected to bending loads. The variations in material characteristics with regard to position along the cross-section of a steel tube member is first considered in this experimental study, providing for a more accurate definition of the material be

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33

BROWN, B. P., and B. M. ARGROW. "Two-dimensional shock tube flow for dense gases." Journal of Fluid Mechanics 349 (October 25, 1997): 95–115. http://dx.doi.org/10.1017/s0022112097006575.

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Non-stationary oblique shock wave reflections for fluids in the dense gas regime are examined for selected cases. A time-accurate predictor-corrector TVD scheme with reflective boundary conditions for solving the Euler equations simulates the evolution of a wave field for an inviscid van der Waals gas near the thermodynamic critical point. The simulated cases involve shock tube flows with compressive wedges and circular arcs. Non-classical phenomena, such as disintegrating shocks, expansion shocks, composite waves, etc., demonstrate significant differences from perfect gas flow fields over sim

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34

Liu, Qin, and Liping Geng. "Effect of passive commutation on heat transfer and flow characteristics of non-circular pipes." Journal of Physics: Conference Series 2360, no. 1 (2022): 012031. http://dx.doi.org/10.1088/1742-6596/2360/1/012031.

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Based on the need for energy-saving and consumption reduction in industrial applications, the effect of an internal concave structure on a heat exchanger tube with a right-angle trapezoidal cross-section and changing the flow direction on the heat transfer and flow characteristics in the tube was investigated. CFD techniques were used to study the effect of the inner concave structure with 15mm and 30mm center spacing and 1.88mm and 3.75mm radius of curvature on the heat transfer and flow characteristics of air under turbulent flow conditions in the range of Re13349 to 57847, and the heat tran

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35

Safari, Mehdi, Ricardo J. Alves de Sousa, and Jalal Joudaki. "Experimental Investigation of the Effects of Irradiating Schemes in Laser Tube Bending Process." Metals 11, no. 7 (2021): 1123. http://dx.doi.org/10.3390/met11071123.

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The laser tube bending process (LTBP) process is a thermal non-contact process for bending tubes with less springback and less thinning of the tube. In this paper, the laser tube bending process will be studied experimentally. The length of irradiation and irradiation scheme are two main affecting process parameters in the LTBP process. For this purpose, different samples according to two main irradiation schemes (Circular irradiating scheme (CIS) and axial irradiating scheme (AIS)) and different lengths of laser beam irradiation (from 4.7 to 28.2 mm) are fabricated. The main bending angle of

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36

Zhou, Feng, and Ben Young. "Compressive strengths of concrete-filled double-skin (circular hollow section outer and square hollow section inner) aluminium tubular sections." Advances in Structural Engineering 22, no. 11 (2019): 2418–34. http://dx.doi.org/10.1177/1369433219842381.

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Experimental and numerical investigations of concrete-filled double-skin aluminium stub column with a circular hollow section as the outer skin and a square hollow section as the inner skin are presented in this article. A test program was carried out to study the influences of aluminium tube geometric dimensions and concrete strength on structural performance and strength of composite columns. A series of composite columns was tested on outer circular hollow section tubes and inner square hollow section tubes; the spaces between them had been filled with concrete of different nominal cylinder

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37

Rdzanek, Wojciech P., Krzysztof Szemela, Jerzy Wiciak, and Marek Pawelczyk. "Sound radiation by a vibrating circular plate located at the bottom of a non-rigid flanged circular cylindrical tube." Journal of Sound and Vibration 547 (March 2023): 117525. http://dx.doi.org/10.1016/j.jsv.2022.117525.

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38

Gao, Qiang, Liangmo Wang, Yuanlong Wang, and Chenzhi Wang. "Multi-objective optimization of a tapered elliptical tube under oblique impact loading." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 231, no. 14 (2017): 1978–88. http://dx.doi.org/10.1177/0954407017690963.

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All types of thin-walled tube with different configurations were studied to determine their crashworthiness performances. A novel single-cell tapered elliptical tube is proposed in this paper. First, the crashworthiness performance of the single-cell tapered elliptical tube subjected to different oblique impacts was compared with those of other tubes with different configurations (straight, tapered, and multi-cell tapered) and different cross-sections (square, rectangular, and circular). It can be found that the single-cell tapered elliptical tube shows a better crashworthiness performance at

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39

Kumar, Arvind, Kunal Dey, Suvanjan Bhattacharyya, et al. "Augmented thermal performance in a non-uniform heat flux circular tube with twisted tape insert using hybrid nanofluid." E3S Web of Conferences 321 (2021): 04009. http://dx.doi.org/10.1051/e3sconf/202132104009.

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The influence of non-uniform heat transfer on a circular tube with a twisted tape insert using nanofluid (NF) is examined. The circular tube had an inner diameter 20 mm, with 0.5 mm thickness and 2 m of length. Wall heat flux conditions were examined for Reynolds number ranging from 5 000 to 25 000. Heat flux distribution included partial heating at different circumferential positions. Water was used as a base fluid, while single and multi-nano particles are used for simple and hybrid nanofluids (HNF). The goal of this study is to augment the thermal performance by incorporating non-uniform he

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40

Drobyazgin, E. A., and Yu V. Chikinev. "Stenting of the trachea with cicatricial stenosis, immediate and long-term results." Filin’s Clinical endoscopy 64, no. 3 (2024): 4–10. http://dx.doi.org/10.31146/2415-7813-endo-64-3-4-10.

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The aim of study Evaluation of the results of stenting in the treatment of cicatricial stenosis of the trachea. Materials and methods During the period from 1995 to 2023, 154 patients with cicatricial stenosis of the trachea were treated (men - 109 (70.77%), women - 45 (29.22%). The age of the patients ranged from 15 to 83 years. Patients of working age (from 20 to 50 years old) were 102 (66, 23%). The causes of stenosis were: tracheostomy and / or prolonged mechanical lung ventilation through a tracheostomy tube (106-68.83%), mechanical ventilation through the orotracheal tube (38-24.67%), in

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Ghani, Amir Radzi Ab, Ramlan Kasiran, Mohd Shahriman Adenan, et al. "Novel Design of Impact Attenuator for an 'Eco Challenge' Car." Applied Mechanics and Materials 165 (April 2012): 237–41. http://dx.doi.org/10.4028/www.scientific.net/amm.165.237.

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Thin-walled metallic tubular structures are generally used as impact energy absorber in automotive structures due to their ease of fabrication and installation, high energy absorption capacity and long stroke. However, unlike a normal passenger car where the impact energy can be distributed throughout the whole structure, the impact energy absorbing system of an Eco-Challenge car is confined within a limited space on the front bulkhead. The challenge is to develop an impact attenuator system that can effectively absorb the impact energy within the given space and fulfil the specified rate of d

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KATOH, Kenichi, and Shinnosuke KAJII. "Development of less-pulsating flow tube pump using non-circular gears and repetitive control." Proceedings of JSME annual Conference on Robotics and Mechatronics (Robomec) 2016 (2016): 2A2–05a1. http://dx.doi.org/10.1299/jsmermd.2016.2a2-05a1.

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Männer, Jörg, and Talat Mesud Männer. "Functional Morphology of the Cardiac Jelly in the Tubular Heart of Vertebrate Embryos." Journal of Cardiovascular Development and Disease 6, no. 1 (2019): 12. http://dx.doi.org/10.3390/jcdd6010012.

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The early embryonic heart is a multi-layered tube consisting of (1) an outer myocardial tube; (2) an inner endocardial tube; and (3) an extracellular matrix layer interposed between the myocardium and endocardium, called “cardiac jelly” (CJ). During the past decades, research on CJ has mainly focused on its molecular and cellular biological aspects. This review focuses on the morphological and biomechanical aspects of CJ. Special attention is given to (1) the spatial distribution and fiber architecture of CJ; (2) the morphological dynamics of CJ during the cardiac cycle; and (3) the removal/re

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Arulprakasajothi, Mahalingam, Kariappan Elangovan, Udayagiri Chandrasekhar, and Sivan Suresh. "Performance study of conical strip inserts in tube heat exchanger using water based titanium oxide nanofluid." Thermal Science 22, no. 1 Part B (2018): 477–85. http://dx.doi.org/10.2298/tsci151024250a.

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The objective of the study is to observe the Nusselt number and friction factor behavior in a tube heat exchanger fitted with staggered and non-staggered conical strip inserts using water based titanium oxide nanofluid under laminar flow conditions. Water based titanium oxide nanofluid was prepared using a two-step method with a volume concentration of 0.1% and 0.5%. The tube inserts used were staggered and non-staggered conical strips having three different twist ratios of 2, 3, and 5. The experimental results indicated that the Nusselt number increased in the presence of water based titanium

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Zhang, Zhao Qiang, and Yong Yao. "Analysis on Bearing Capacity of Solid Multibarrel Tube-Confined Concrete Short Columns (CHS Inner and SHS Outer) under Axial Compressive Load." Advanced Materials Research 255-260 (May 2011): 151–56. http://dx.doi.org/10.4028/www.scientific.net/amr.255-260.151.

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By introducing the reduction coefficient of concrete strength and the equivalent restriction reduction coefficient,the non-uniform confinement force of square steel tube to its core concrete is turned to that of equivalent circular steel tube. Then the ultimate load calculation formula for the solid multibarrel tube-confined concrete short columns (CHS inner and SHS outer) is derived based on the Unified Strength Theory(UST),in which the double restriction effect and the decrease of longitudinal stress because of the hoop tensile tension are considered. The influence of intermediate principal

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Chen, Jun Ling, Xin Huang, and Ren Le Ma. "Study on the Buckling of Steel Columns with one Special-Shaped Section." Advanced Materials Research 255-260 (May 2011): 369–73. http://dx.doi.org/10.4028/www.scientific.net/amr.255-260.369.

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One large-diameter and non-circular steel tube was adopted in Henan TV tower (China). This special cross-section consists of three flat plates welded to three arc plates one by one. This paper studies the critical local buckling behavior of steel plates by using the finite element analysis method. Initial geometric imperfections and residual stresses presented in steel plates, material yielding and strain hardening were taken into account in the nonlinear analysis. An experimental study was performed to verify the capacity ability of this special steel tube. Based on the results obtained from

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Hario Yudhanto, Ashando, Bambang Piscesa, Mario M. Attard, Budi Suswanto, and Priyo Suprobo. "Finite element modeling of concrete confined with circular thin-walled steel sheet." E3S Web of Conferences 156 (2020): 05009. http://dx.doi.org/10.1051/e3sconf/202015605009.

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For a reinforced concrete column to behave in a ductile manner without much loss on strength requires sufficient confinement to the concrete core. One way to provide confinement to the concrete core is to use external confining devices such as a series of thin-walled circular steel sheet tube to confine the concrete. This type of external confining device falls off on the categories of Steel Tube Confined Concrete (STCC). With the presence of a gap between the steel sheet, the buckling on the tube due to high axial stresses can be avoided. On the other hand, STCC also offers great advantages t

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Zhang, Jingzhi, Bo Zhang, Li Lei, Cheng Cheng, Jinjin Xu, and Naixiang Zhou. "Experimental Study on Heat Transfer Characteristics of Two-Phase Flow in Square and Rectangular Channels." Energies 15, no. 22 (2022): 8453. http://dx.doi.org/10.3390/en15228453.

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Two-phase flow in non-circular cross-section flow channels such as micro-heat sinks and micro-channel heat exchangers has received extensive attention due to its heat-enhancing properties. In this paper, under the boundary of constant heat flux, an experimental investigation of the heat transfer properties of gas–liquid two-phase flow in horizontal channels with cross-sections of 4 × 4 mm and 8 × 3 mm is carried out using air and water as working fluids. The effects of different inlet gas and liquid inlet Reynolds numbers on the wall temperature and Nusselt number are discussed. The results sh

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KATOH, Kenichi, and Shogo SAIKI. "2A2-O02 Development of non-pulsatile tube pump using non-circular gears(Mechanism and Control for Actuator (2))." Proceedings of JSME annual Conference on Robotics and Mechatronics (Robomec) 2014 (2014): _2A2—O02_1—_2A2—O02_3. http://dx.doi.org/10.1299/jsmermd.2014._2a2-o02_1.

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Batyuk, L. V., and N. M. Kizilova. "Maghetohydrodynamic flows of micro/nano fluids through thin capillaries." Bulletin of Taras Shevchenko National University of Kyiv. Series: Physics and Mathematics, no. 3 (2019): 32–36. http://dx.doi.org/10.17721/1812-5409.2019/3.4.

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Steady magnetohydrodynamic (MHD) flows of suspensions of conducting micro/nanoparticles through a thin tube of a circular cross-section in a transverse constant magnetic field driven by a constant pressure drops at the ends of the tube is studied. The governing MHD system of equations for a viscous incompressible micro/nanofluid in the non-induction approximation is solved with the second order velocity slip boundary condition at the wall of the tube. The material parameters of the fluid are considered as nonlinear functions of the particle concentration according to the mixture models of susp

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