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Articles de revues sur le sujet « Pipes with varying section »

Auteur : Grafiati

Publié le 9 mars 2023

Mis à jour le 31 juillet 2025

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1

Yang, Kun, Jun Hu, and Tao Wang. "Heat-Flow Coupling Law for Freezing a Pipe Reinforcement with Varying Curvatures." Applied Sciences 13, no. 19 (2023): 10932. http://dx.doi.org/10.3390/app131910932.

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Using the temperature and seepage field-coupling module within COMSOL Multiphysics software, we examined freezing behavior and its evolving patterns in curved underground freezing pipes. This study employed transient states, with the Darcy’s law and porous-media heat-transfer options activated in the Physical Field Interface of the Physical Field and Variable Selection column. The models were created to establish numerical models of freezing reinforcement for both single and multiple pipes with various curvatures. These models were designed to simulate the evolving temperature and seepage fiel

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2

Yu, Hao, Feng Liang, Yu Qian, Junjie Gong, Yao Chen, and An Gao. "Phononic Band Gap and Free Vibration Analysis of Fluid-Conveying Pipes with Periodically Varying Cross-Section." Applied Sciences 11, no. 21 (2021): 10485. http://dx.doi.org/10.3390/app112110485.

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Phononic crystals (PCs) are a novel class of artificial periodic structure, and their band gap (BG) attributes provide a new technical approach for vibration reduction in piping systems. In this paper, the vibration suppression performance and natural properties of fluid-conveying pipes with periodically varying cross-section are investigated. The flexural wave equation of substructure pipes is established based on the classical beam model and traveling wave property. The spectral element method (SEM) is developed for semi-analytical solutions, the accuracy of which is confirmed by comparison

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3

Ao-kui, Xiong, and Wei Qing-ding. "The decay of swirling flows in a type of cross-section-varying pipes." Applied Mathematics and Mechanics 22, no. 8 (2001): 983–88. http://dx.doi.org/10.1007/bf02436398.

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Kotorynski, W. P. "Dispersion in Pipes with Slowly Varying Cross-Sections." SIAM Journal on Mathematical Analysis 25, no. 3 (1994): 915–40. http://dx.doi.org/10.1137/s0036141090183730.

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Xijie, Liu, Sami Ainane, and Yap Yit Fatt. "Modeling of liquid-solid flow erosion in curved pipes of gradually varying cross section." Journal of Physics: Conference Series 1276 (August 2019): 012028. http://dx.doi.org/10.1088/1742-6596/1276/1/012028.

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LUCHINI, PAOLO, and FRANÇOIS CHARRU. "Consistent section-averaged equations of quasi-one-dimensional laminar flow." Journal of Fluid Mechanics 656 (July 1, 2010): 337–41. http://dx.doi.org/10.1017/s0022112010002594.

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Section-averaged equations of motion, widely adopted for slowly varying flows in pipes, channels and thin films, are usually derived from the momentum integral on a heuristic basis, although this formulation is affected by known inconsistencies. We show that starting from the energy rather than the momentum equation makes it become consistent to first order in the slowness parameter, giving the same results that have been provided until today only by a much more laborious two-dimensional solution. The kinetic-energy equation correctly provides the pressure gradient because with a suitable norm

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Ključanin, Dino, and Abaz Manđuka. "The cantilever beams analysis by the means of the first-order shear deformation and the Euler-Bernoulli theory." Tehnički glasnik 13, no. 1 (2019): 63–67. http://dx.doi.org/10.31803/tg-20180802210608.

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The effect of the Timoshenko theory and the Euler-Bernoulli theory are investigated in this paper through numerical and analytical analyses. The investigation was required to obtain the optimized position of the pipes support. The Timoshenko beam theory or the first order shear deformation theory was used regarding thick beams where the shearing effect of the beam is considered. The study of the thin beams was performed with the Euler-Bernoulli theory. The analysis was done for stainless steel AISI-440C beams with the rectangular cross-section. The steel beams were a cantilever and stressed un

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JANG, DONG SOO, EUN-JI LEE, SANG HUN LEE, and YONGCHAN KIM. "THERMAL PERFORMANCE OF FLAT PLATE PULSATING HEAT PIPES WITH MINI- AND MICROCHANNELS." International Journal of Air-Conditioning and Refrigeration 22, no. 04 (2014): 1450025. http://dx.doi.org/10.1142/s2010132514500254.

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This study presents the thermal performance of pulsating heat pipes (PHPs) using distilled water with mini- and microchannels. The PHPs were fabricated with the channels of square cross section which had hydraulic diameters ranged from 1.6 to 3.2 mm in minichannels and from 0.714 to 0.941 mm in microchannels. The performance of the PHPs was measured and analyzed by varying hydraulic diameter, number of turns, filling ratio, and input power. The filling ratio of the working fluid varied from 0% to 100%. The input power was controlled in the range between 3.6 and 150 W. The hydraulic diameter, n

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Trykoz, L. V., S. M. Kamchatnaya, O. M. Pustovoitova, and A. O. Atynian. "The Investigation of Prestressed Pressure Pipes, Reinforced with Fiberglass Plastic." International Journal of Engineering Research in Africa 36 (June 2018): 1–11. http://dx.doi.org/10.4028/www.scientific.net/jera.36.1.

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The problem of a combined action of reinforced concrete pipe and fiberglass safety cage. The prestressed cage not only decreases deformability of a pipe under load but protects the material of a pipe from agressive external factors. The process of force transfer from concrete pipe and fiberglass has been analyzed and the equation of stress and deformation for pipes and fiberglass has been deduced. It is shown that stress in fiberglass does not remain constant varying wall thickness, reducing towards the concrete core. Hoop stresses in the concrete core increase towards the centre of a pipe. Un

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10

Verbanck, Michel A. "Assessment of sediment behaviour in a cunette-shaped sewer section." Water Science and Technology 33, no. 9 (1996): 49–59. http://dx.doi.org/10.2166/wst.1996.0174.

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The accumulation of deposits in sewers causes widespread concerns of either operational or environmental nature. It is believed that a number of sediment-related nuisances can substantially be controlled in adapting the characteristics of sewer pipes as a function of local constraints and circumstances. In particular, key design parameters such as cross-section shape or hydraulic roughness of inner walls are currently selected basing more on empiricism and intuition than on full knowledge of the sediment transport driving processes. A valid track for optimization of these parameters is to run

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11

J., Venkata Suresh, Bhramara P., and Nagasri K. "Effect of Pure and Binary Fluids on Thermal Performance of Closed Loop Pulsating Heat Pipe." International Journal of Engineering and Advanced Technology (IJEAT) 9, no. 3 (2020): 1761–21. https://doi.org/10.35940/ijeat.C5612.029320.

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Pulsating heat pipe is the raising methodology of cooling systems in many areas. CLPHP is a passive mode of phase change heat transfer device having potential to transfer heat from source to sink in less span. Heat transfer performance of this method is improving day by day as giving less thermal resistance. Number of experimentations are conducting to increase the efficiency of pulsating heat pipes in many aspects i.e. varying lengths, working fluids, number of turns, different fill ratios, heat inputs and orientation. As taking part of these research a five turn closed loop pulsating heat pi

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12

Hakimuddin, A. K. Kurchania, Ravi Mathur, Deepak Sharma, and Nafisa Ali. "Design and Performance Evaluation of a Commercial size Fixed Dome Biogas Plant." Journal of Agricultural Engineering (India) 47, no. 3 (2024): 24–29. http://dx.doi.org/10.52151/jae2010473.1415.

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A community size fixed dome cattle dung feed biogas plant of 25 m3 capacity, based on solid-state fermentation, was designed and constructed with brick masonry without using RCC. The shape of the designed plant was of capsule structure. The diameter of lower spherical segment of digester was 4.95 m with the height of the middle cylindrical section as 1.98 m and the depth of bottom spherical segment as 0.98 m. Two cement pipes, diameter 600 mm, were attached to facilitate the feeding of charge. Feeding was carried out with fresh cattle dung having moisture content of 16 per cent. The gas yield

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13

Kasivisvanathan, S. R., P. N. Kaloni, and K. R. Rajagopal. "Flow of a non-newtonian fluid through axisymmetric pipes of varying cross-sections." International Journal of Non-Linear Mechanics 26, no. 5 (1991): 777–92. http://dx.doi.org/10.1016/0020-7462(91)90028-r.

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Bobyleva, T., and A. Shamaev. "Optimization Problems Arising from the Design of Pipes Made of Composite Materials." Materials Science Forum 992 (May 2020): 1024–29. http://dx.doi.org/10.4028/www.scientific.net/msf.992.1024.

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The work is devoted to the construction of analytical solutions for the stress-strain state of a cylindrical hollow elastic rod with a layered structure along the radius. Earlier, the problem of finding the stress-strain state of a rod of composite material fixed at one end with the applied forces and moments of forces at the other end was considered. An approximate representation of the solutions was given, which included auxiliary problems on one fragment of the cylinder, consisting of periodically repeating similar fragments. Such auxiliary problems in the general case do not have an analyt

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Kim, Taesik, Suleyman Deveci, Inmo Yang, Bob Stakenborghs, and Sunwoong Choi. "Visual, Non-Destructive, and Destructive Investigations of Polyethylene Pipes with Inhomogeneous Carbon Black Distribution for Assessing Degradation of Structural Integrity." Polymers 14, no. 5 (2022): 1067. http://dx.doi.org/10.3390/polym14051067.

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Carbon black (CB) is used in polyethylene (PE) pipes to protect against thermal and photooxidation. However, when CB is not properly dispersed in the PE matrix during processing, white regions having little or no CB concentration, known as “windows,” appear within the CB/PE mixed black compound. In some cases, windows can drastically affect the structural integrity of both the pipe and butt fusion joint. In this work, PE pipes with varying amounts of windows were investigated for their characteristic window patterns, as well as quantifying the area fraction of windows (% windows). Tensile test

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16

Zhang, Xuetong, He Ling, Yunfan Hu, and Xukun Jiang. "Bending characteristics and springback prediction for straightening of carbon steel-stainless steel bimetallic composite pipes." Journal of Physics: Conference Series 3021, no. 1 (2025): 012076. https://doi.org/10.1088/1742-6596/3021/1/012076.

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Abstract This paper focuses on carbon steel-stainless steel bimetallic composite pipes as the subject of investigation. By employing the theory of elastoplasticity, an analysis is conducted on the evolution of elastoplastic deformation across the cross-section of the composite pipe. Consequently, a formula delineating the moment-to-elastic-zone ratio segments under pressure straightening conditions for the composite pipe has been derived. The influence of varying ratios of pipe diameter and yield strength on the model is examined. Furthermore, three-point bending simulations were conducted by

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17

Baptista, Nishida, Larissa Krambeck, Dos Dias, and Alves Antonini. "Experimental investigation of heat pipe thermal performance with microgrooves fabricated by wire electrical discharge machining." Thermal Science 24, no. 2 Part A (2020): 701–11. http://dx.doi.org/10.2298/tsci180227206b.

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This work presents the use of electrical discharge machining (EDM) technology for manufacturing of three different types of axial microgrooves in heat pipes. This specific process, called wire electrical discharge machining (wire-EDM), allows the fabrication of microgrooves on the inner wall of a heat pipe with accuracy. Different from other capillary structures, such as composite wick and screen mesh, the material is removed from the pipe?s container in order to conceive the capillary structure, which contributes with the mass reduction of the passive two-phase heat transfer device. The heat

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18

Bondarev, Edward, Igor Rozhin, and Kira Argunova. "Problem of conjugate heat transfer between main gas pipeline and frozen ground." E3S Web of Conferences 102 (2019): 01001. http://dx.doi.org/10.1051/e3sconf/201910201001.

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Mathematical model of non-isothermal gas flow within the framework of tube hydraulics including change of tube cross-section due to hydrate formation and the dependence of coefficient of heat transfer between gas and hydrate layer on varying flow area is proposed. The corresponding conjugate problem of heat exchange between imperfect gas in the pipeline and the environment is reduced to the solution of differential equations describing non-isothermal flow of gas in pipes and heat transfer equations in ground with the corresponding conjugation conditions. In the quasi-stationary mathematical mo

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19

Kuo, Chi-Wei, and C. Steve Suh. "On the Dispersion and Attenuation of Guided Waves in Tubular Section with Multi-Layered Viscoelastic Coating — Part I: Axial Wave Propagation." International Journal of Applied Mechanics 09, no. 01 (2017): 1750001. http://dx.doi.org/10.1142/s1758825117500016.

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Guided modes admissible in elastic hollow pipes are derived to establish their dispersion and attenuation characteristics in the presence of multi-layered viscoelastic coatings. Longitudinal waves propagating in the axial direction in response to displacement continuity boundary conditions signifying perfect interfacial bonds are evaluated against a baseline uncoated tubing. Viscoelastic bitumen and epoxy are coating materials applied to improve pipeline reliability. The impact of viscoelastic coating layers on wave dispersion and attenuation are investigated by incorporating complex material

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20

He, Yongjun, Jian Cheng, Zengli Shi, et al. "Research on Axial Stress and Strain Characteristics of Reinforced-Concrete Curved Pipe Jacking in Power Tunnels." Buildings 14, no. 9 (2024): 3030. http://dx.doi.org/10.3390/buildings14093030.

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Joint deflection during curved pipe jacking in power tunnels poses a significant risk of structural failure due to the resulting eccentric and diagonal loading on the pipes. This study investigated the axial stress and strain characteristics of reinforced-concrete pipes under varying joint deflection angles and jacking forces, using a combined approach of experimental model testing and finite element method (FEM) numerical simulations. The experimental setup replicated curved pipe jacking conditions, allowing for the measurement of strains and deformation under controlled loading. Numerical si

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21

Shevchenko, Nataliya, Vladyslav Kaliuzhnyi, and Viktoriia Andriievska. "NUMERICAL SIMULATION OF PROCESS FLUID FLOW IN THE PIPES OF A COILED TUBING INSTALLATION." Bulletin of the National Technical University "KhPI". Series: Hydraulic machines and hydraulic units, no. 1 (October 10, 2023): 60–65. http://dx.doi.org/10.20998/2411-3441.2023.1.10.

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Today, one of the modern trends is the use of coiled tubing technologies and improvement of the composition of washing agents (liquids). The features of coiled tubing technological sections are considered – spiral pipe laying, the ratio of the main dimensions of flexible pipes, drum and guide sector. The presence of a pipe conveyor gives special responsibility for ensuring the movement of a string of flexible pipes within a given load range. The length of the pipes reaches 5000 m. The radial dimensions of the well are 150 mm. The stages of determining the main parameters of a pumping unit for

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22

Li, Shuanglong, Limin Wei, Xiaobin Chen, and Qun He. "Numerical Investigation on Dynamic Performance of a Bridge-Tunnel Transition Section with a Deep Buried Pile-Plank Structure." Advances in Civil Engineering 2020 (September 29, 2020): 1–16. http://dx.doi.org/10.1155/2020/8885535.

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To address the track irregularity at transition zones between subgrade and rigid structures (bridge, tunnel, etc.), some common transition approaches, such as trapezoid subgrade, were adopted in many engineering areas. However, in regard to a mountainous area, the common transition approaches may not be practicable anymore due to the limitation of the length between subgrade and rigid structures. In this paper, a new type of bridge-tunnel transition section with a deeply buried pile-plank structure (DBPPS) for short-distance transition is introduced. A three-dimensional finite element model th

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Kwarteng, Felix, Charles K. Kankam, Jack O. Banahene, George Oti Boateng, and Edward Ceasar Mansal. "Predictive Behaviour from Finite Element Analysis on PVC-Ducted Reinforced Concrete Column." Journal of Engineering Research and Reports 26, no. 3 (2024): 145–60. http://dx.doi.org/10.9734/jerr/2024/v26i31101.

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This research investigated the behaviour of square reinforced concrete columns with embedded PVC pipes, aiming to comprehensively analyze their performance. The study addressed the lack of significant research on the contributions and effects of embedded PVC pipes on structural performance compared to hollow columns. The objectives of the study sought to evaluate the contributions and effects of embedded PVC pipes on the structural performance of columns under loading conditions, determine how the presence of PVC pipes influenced the columns' ability to deform and dissipate energy, and identif

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Sukadana, Ida Bagus Putu. "UJI VISUAL THERMOGRAPHY PADA OSCILLATING HEAT PIPE." JTT (Jurnal Teknologi Terapan) 5, no. 1 (2019): 21. http://dx.doi.org/10.31884/jtt.v5i1.163.

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Oscillating Heat Pipes one of the new family of heat pipe is two-phase heat transfer technologies with excellent performance capabilities, simple structure and low production costs. As one of the non-intrusive method in temperature measurement, thermography observation in OHP still very rarely to use although the result was able to explain the relation between temperature oscillation and fluidic motion of fluid. Furthermore this paper aims to study the behavior of thermal profile with the thermography observation. Water with filing ratio (45%) has been chosen as the working fluid for the close

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Giardina, M., and P. Buffa. "Simulations of single and two-phase flows through helical tubes with different geometries and mass flow rates." Journal of Physics: Conference Series 2940, no. 1 (2025): 012026. https://doi.org/10.1088/1742-6596/2940/1/012026.

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Abstract Predictions of pressure drops in helical pipes using the Relap5/mod3.3 code are explored, despite the code’s limitations in modeling such geometries. To address this, the code was modified to incorporate helical tube geometries and correlations for frictional pressure drops under both single-phase and two-phase flow conditions. Comparisons with experimental data on pressure drops across test sections with varying curvature ratios, operational pressures, and mass flow rates were made. The study demonstrates that the modified Relap5 code significantly improves the accuracy of frictional

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Tran, Khiem T., Scott J. Wasman, Michael McVay, and Rodrigo Herrera. "Capacity evaluation of voided driven piles using embedded data collectors." Canadian Geotechnical Journal 54, no. 10 (2017): 1397–407. http://dx.doi.org/10.1139/cgj-2017-0008.

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This paper presents an application of a method that will be implemented in the embedded data collector (EDC) system in the near future, to estimate the capacity of driven piles with a combined solid and voided cross section. Data from accelerometers and strain gauges located in the solid sections at both the top and the bottom of a pile are used to independently estimate the pile’s skin friction and tip resistance. Wave propagation along the pile is modeled as a one-dimensional wave equation, with a nonuniform cross section and with nonlinear static skin friction and viscous-damping soil resis

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UEHIGASHI, Atsushi, Shigeki SUGIURA, Koji MORINISHI, and Nobuyuki SATOFUKA. "Numerical Investigation Using Compressible Navier-Stokes Equations for Low-Speed Flow in Pipes with Varying Cross Sections." JSME international journal. Ser. 2, Fluids engineering, heat transfer, power, combustion, thermophysical properties 35, no. 4 (1992): 507–12. http://dx.doi.org/10.1299/jsmeb1988.35.4_507.

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Figliuzzi, B., and C. R. Buie. "Rise in optimized capillary channels." Journal of Fluid Mechanics 731 (August 14, 2013): 142–61. http://dx.doi.org/10.1017/jfm.2013.373.

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AbstractMany technological applications rely on the phenomenon of wicking flow induced by capillarity. However, despite a continuing interest in the subject, the influence of the capillary geometry on the wicking dynamics remains underexploited. In numerous applications, the ability to promote wicking in a capillary is a key issue. In this article, a model describing the capillary rise of a liquid in a capillary of varying circular cross-section is presented. The wicking dynamics is described by an ordinary differential equation with a term dependent upon the shape of the capillary channel. Us

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Bai, Lihang, Zhang Liu, Yulong Ji, and Shuai Wang. "A Ratchet for Closed Pipes: Asymmetric-Configuration Role on Unidirectional Circulatory Flows." Energies 18, no. 2 (2025): 259. https://doi.org/10.3390/en18020259.

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Unidirectional pulsating heat pipes (PHPs) have been extensively investigated. However, a comprehensive understanding of the mechanism is still lacking. In this study, we analyze the unidirectional flow (distinct from thermosyphon) in closed PHP loops and reveal that the combined effect of the diameter variation and pressure distribution leads to a stable circulatory flow. Analogous to the Carnot thermodynamic cycle, a flow dynamical cycle along the loop is proposed to determine the highest momentum increment rate at the limit of the pressures and tube cross-sections. Furthermore, an effective

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Badu, Prakash, Kushal Guragain, and Durga Bastakoti. "Computational Evaluation of Pulsating Heat Pipe for Fluid Flow Behavior and its Thermal Performance." Journal of Engineering and Sciences 3, no. 1 (2024): 93–100. http://dx.doi.org/10.3126/jes2.v3i1.66245.

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Computational fluid analysis of a single circuit heat pipe was undertaken to ascertain the thermal efficiency of water at various fill ratios, specifically 40%, 50%, and 60% under varying heating conditions. The analysis employed the ANSYS Fluent computational fluid dynamics software, utilizing a k-epsilon to the heat pipe as the solver. The analysis was carried out on a copper tube with an internal diameter measuring 3/16 inches. During the analysis, the thermal inflow at the adiabatic region was adjusted to zero, while the condenser region’s temperature remained constant at 25°C. Meanwhile,

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SARKODIE, KWAME, Christopher Bruce Konu, Michael Edem Kweku Donkor, William Apau Marfo, Gertrude Osei Tutu, and Prosper A. Akaba. "Design and development of a low-cost non-intrusive passive acoustic sensor." Journal of the Ghana Institution of Engineering (JGhIE) 23, no. 3 (2023): 52–63. http://dx.doi.org/10.56049/jghie.v23i3.135.

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In this paper, we report on the development and performance study of a low-cost non-intrusive passive acoustic sensor (NIPAS), suitable for gas flow rate measurement and monitoring in pipelines and other similar applications. Detailed information on the design considerations, development, construction, and assembly of the sensor and its unit are also provided in this paper. The complete NIPAS unit is made up of two sensor heads fixed at the test section of a designed flow loop to receive the acoustic emission signals generated from the varying gas flow rate and processed by a control unit for

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Wei, Rongzhi, Xiaotian Li, Murilo Augusto Vaz, and Anderson Barata Custódio. "Finite Element Modelling of Pressure Armour Unlocking Failure in Unbonded Flexible Risers." Journal of Marine Science and Engineering 13, no. 3 (2025): 411. https://doi.org/10.3390/jmse13030411.

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Flexible pipes can be subjected to extreme bending load during installation and in situ operations, as well as high pressure from oil and gas field production fluids. Although field experience shows that the unlocking of the pressure armour layer is a rare failure mode, its consequences are potentially catastrophic. To investigate the unlocking mechanism of the pressure armour layer, a 3D nonlinear finite element model is developed, which contains three layers: a pressure armour layer with a “Zeta” shape cross-section, a polymer layer, and an analytical cylindrical surface representing the rad

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Vilca, Nicher Saul, Ana María Gómez-Amador, and Juan José Jiménez de Cisneros Fonfría. "Soil–Structure Interaction Analysis Using the Finite Element Method in Thin-Walled Steel Pipes Buried under Haul Roads." Applied Sciences 14, no. 1 (2023): 167. http://dx.doi.org/10.3390/app14010167.

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This paper addresses the challenges associated with steel pipes used for transporting liquid fluids within buried sections of mining facilities, specifically in areas with heavy mining vehicles. While existing design standards, such as AW-WA M11, and manufacturer recommendations largely consider loads from vehicles like the AASHTO HS20 or Cooper E-80, both weighing below 35 tons, these guidelines inadequately represent the actual loads experienced on certain mining roads, notably those accommodating heavy vehicles, like haul roads. The research presented here focuses on the interaction between

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Libreros, Jose, and Maria Trujillo. "Effects of Mesh Generation on Modelling Aluminium Anode Baking Furnaces." Fluids 6, no. 4 (2021): 140. http://dx.doi.org/10.3390/fluids6040140.

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Anode baking is critical in carbon anode production for aluminium extraction. Operational and geometrical parameters have a direct impact on the performance of anode baking furnaces (ABF), and hence on the resulting anode quality. Gas flow patterns, velocity field, pressure drop, shear stress and turbulent dissipation rate are the main operational parameters to be optimised, considering a specific geometry that is discretised as a mesh. Therefore, this paper aims to establish the need to generate an appropriate mesh to perform accurate numerical simulations of three-dimensional turbulent flow

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Burg, Patrik, Tomáš Vítěz, Jan Turan, and Jana Burgová. "Evaluation of Grape Pomace Composting Process." Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis 62, no. 5 (2014): 875–81. http://dx.doi.org/10.11118/actaun201462050875.

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The paper deals with the problems of composting of grape pomace in strip compost piles. The three variants of compost piles formed from grape pomace and vegetables waste, wood chips and mature in varying proportions were tested. Turning of piles was performed using windrow turner PKS 2.8, in which the achieved performance was monitored. On the performance of windrow turner has a significant influence also cross section or width and height of turning piles and the bulk density of ingredients including their moisture. In evaluating, attention has been paid to assessment of selected parameters (t

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Cattani, L., L. Pagliarini, F. Bozzoli, et al. "Estimation of the local instantaneous heat flux inside a pulsating heat pipe for space applications." Journal of Physics: Conference Series 2444, no. 1 (2023): 012010. http://dx.doi.org/10.1088/1742-6596/2444/1/012010.

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Abstract Pulsating Heat Pipes (PHP) are promising and effective passive two-phase heat transfer devices in terms of high heat transfer capability, efficient thermal control, adaptability and low cost and therefore they have been extensively studied in the last years. Many authors have estimated the heat fluxes at the evaporator and at the condenser area only in terms of the average values based on first principle considerations. In the present study the application of an inverse analysis technique to experimental infrared temperature data is proposed to investigate the local convective heat fl

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Kanarska, Yuliya, and Otis Walton. "Application of parallel distributed Lagrange multiplier technique to simulate coupled Fluid-Granular flows in pipes with varying Cross-Sectional area." Powder Technology 291 (April 2016): 35–45. http://dx.doi.org/10.1016/j.powtec.2015.11.062.

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Lee, SangGu, SiHun Lee, SangJoon Shin, Youdan Kim, and Soogab Lee. "Pressure mode analysis of nonuniform cross-sectional pipes and preliminary evaluation of a pogo suppressor." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 233, no. 12 (2019): 4447–56. http://dx.doi.org/10.1177/0954410018823627.

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The pogo phenomenon is a type of instability that arises when the longitudinal modes of a space launch vehicle fuselage resonate with the pressure modes of the feedline in its propulsion system, with such resonance re-exciting the fuselage structure. To analyze this phenomenon, this paper specifically focuses on an analysis of the pressure modes in the space shuttle interpump line included in the LOX engine system. Because the interpump line is connected to pipes in different cross-sectional areas, the pressure modes are analyzed as a nonuniform cross-sectional pipe. Further, by applying a pog

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AL-Shareef, Najla’a H., Ayoob A. Ibrahim, Hayder Al-Khafaji, and Rafaa F. Hassan. "The Torsional Behavior of Transversely Opened Reinforced Concrete Beams Strengthened by Steel Pipe." Tikrit Journal of Engineering Sciences 32, no. 1 (2025): 1–14. https://doi.org/10.25130/tjes.32.1.21.

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One way to strengthen beams with transverse openings is by adding material, such as steel plates or braces, around the openings. This addition helps distribute the load more evenly and reduces stress concentration at the weak points. In this study, experimental investigations were conducted to evaluate the effectiveness of using steel pipes of different sizes and thicknesses to improve the torsional behavior of reinforced concrete beams with different sizes of transverse openings. Another goal is to investigate the impact of different steel pipe orientations on the final twisting moment and tw

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Sui, Guowei, Lin Li, Jialin Zhou, and Erwin Oh. "Parametric Study of Lateral Load on Helical Pipe Piles in Clay." Geotechnics 4, no. 1 (2024): 158–79. http://dx.doi.org/10.3390/geotechnics4010008.

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In the past decades, as the world has placed emphasis on green energy, solar energy has become a favorable option. Different piled foundations have been designed to strengthen the structure supporting the solar panels. These piled foundations include rectangular and circular hollow section piles, as well as H-shaped piles. With various environmental loadings, lateral soil displacement will be encountered when large solar panels are installed on the supporting structure at an inclined angle. Presently, helical pipe piles are widely used in solar farms as part of the supporting structure. In thi

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Lukjanova, Aljona, and Malle Mandre. "Anatomical structure and localisation of lignin in needles and shoots of Scots pine (Pinus sylvestris L.) growing in a habitat with varying environmental characteristics." Forestry Studies / Metsanduslikud Uurimused 49, no. 1 (2008): 37–46. http://dx.doi.org/10.2478/v10132-011-0061-2.

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Anatomical structure and localisation of lignin in needles and shoots of Scots pine (Pinus sylvestrisL.) growing in a habitat with varying environmental characteristicsWe investigated the influence of a habitat with varying environmental characteristics on the anatomical structure and localisation of lignin in needles and shoots of Scots pine (Pinus sylvestrisL.). A dune in South-West Estonia was chosen as the study area because it has extreme environmental characteristics: primitive sandy soil, deficiency of water, heavy winds and high light exposure. Analysis showed that the needles of all a

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Bailey, Breanna, and Sidiq A. Osomo. "Prediction of Nominal Compressive Strength in Steel Piles Subject to Corrosion Losses: A Finite Element Approach." Journal of Civil Engineering and Construction 9, no. 1 (2020): 24–30. http://dx.doi.org/10.32732/jcec.2020.9.1.24.

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This paper presents a method for predicting the nominal compressive strength of steel I-shaped piles subject to cross-sectional losses caused by corrosion. The method requires a finite element linear buckling analysis of the corroded cross-section. Results from the finite element buckling analysis may be integrated into design capacity equations contained in the 15th edition of the American Institute of Steel Construction Steel Construction Manual. Non-linear post-buckling analyses were used to verify the accuracy of the proposed method. Three cross-sectional geometries (W14x82, W14x90, and W1

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Haque, Md Enamul, Md Efthakher Hossain, and Mohammad Mashud. "Performance Analysis of a Heat Pipe with Stainless Steel Wick." Journal of Engineering Advancements 01, no. 01 (2020): 16–22. http://dx.doi.org/10.38032/jea.2020.01.004.

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In this study, the influences of different parameters on performance of a heat pipe with stainless steel net as wick have been presented. Experiments have been carried out for an input power range from 80 W to 160 W, constant cooling water mass flow rate of 0.0515 liter/s, and constant temperature at the inlet to condenser of 11°C. The temperatures were recorded at different power level by using a laser thermometer of the heater block, evaporator and condenser end at 50 second interval. Variation in the input power was done by varying the input voltage. It was done by a variack. Considering al

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Blyth, M. G., A. J. Mestel, and L. Zabielski. "Arterial bends: The development and decay of helical flows." Biorheology: The Official Journal of the International Society of Biorheology 39, no. 3-4 (2002): 345–50. http://dx.doi.org/10.1177/0006355x2002039003004009.

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The macrocirculation is modelled by incompressible Newtonian flow through a rigid network of pipes for which possible simplifications are discussed. The common assumptions of two‐dimensionality or axisymmetry can be generalised to helical symmetry, and in the first part of the paper, the three‐dimensionality of arterial bends is considered by varying the curvature and torsion of a section of a helical pipe. The torsion is found to impart a preferential twist to the cross‐sectional flow. This loss of symmetry ensures that flow separation is less severe for a helical bend than for a toroidal ben

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Peng, Yishu, Ruidong Yang, Tao Jin, Jun Chen, and Jian Zhang. "Potentially toxic metal(loid) distribution and migration in the bottom weathering profile of indigenous zinc smelting slag pile in clastic rock region." PeerJ 9 (April 7, 2021): e10825. http://dx.doi.org/10.7717/peerj.10825.

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Background There are contaminated by potentially toxic metal(loid)s (PTMs) that the surface soil and the weathering profiles around the indigenous zinc smelting slag piles or smelters in the smelting area. However, few systematic studies are currently focusing on the PTM distribution and migration among the slag and its bottom weathering profile. Methods This research determined the concentrations of PTMs and pH values. And we analyzed PTM distribution in the two weathering profiles (slag-covered and slag-absent) with a small horizontal distance in the clastic rock region in the smelting area.

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Yang, Yongqing, Guowei Li, Na Luo, and Xueshan Cao. "Testing of Structural Integrity of U-Shaped Sheet Pile in Canal Engineering Using Ground Penetrating Radar." Applied Sciences 12, no. 22 (2022): 11558. http://dx.doi.org/10.3390/app122211558.

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Compared with other piles with the same cross-sectional area, “U-shaped” structural section sheet pile can increase the moment of inertia of the structure’s section. Due to the large excavation depth of the open section of the “Yin Jiang Ji Huai” river canal project in Anhui province, China, the unprotected excavated inclined canal slope covers a large land area, which results in the current situation of high housing demolition costs and a shortage of land resources in densely populated areas. In this study, the non-destructive testing of a U-shaped sheet-pile wall to protect the vertical slop

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Кумицкий, Б. М., Е. В. Плаксина та А. И. Калинина. "ГИДРОДИНАМИЧЕСКОЕ МОДЕЛИРОВАНИЕ ПРОЦЕССА ПРОМЫВКИ ВЕРТИКАЛЬНЫХ ТРУБОПРОВОДОВ". Housing and utilities infrastructure, № 1(32) (27 березня 2025): 75–83. https://doi.org/10.36622/2541-9110.2025.32.1.008.

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Изложены результаты исследования промывки вертикальных труб, используемых для нужд хозяйственно-питьевого назначения (водоснабжения и водоотведения), в системах отопления, транспортировке нефтепродуктов и т.д. В основу решения рассматриваемой проблемы положена гидродинамическая модель осесимметричного истечения ньютоновской жидкости из вертикального трубопровода сквозь донное круглое отверстие регулируемого сечения. При этом предполагается полное заполнение исследуемой трубы вязкой жидкостью, представляющей собой сплошную среду с некоторым центром масс, положение которого изменяется в процессе

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Ness, O. B., and R. Verley. "Strain Concentrations in Pipelines With Concrete Coating." Journal of Offshore Mechanics and Arctic Engineering 118, no. 3 (1996): 225–31. http://dx.doi.org/10.1115/1.2828838.

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This paper concerns the strain distribution, and in particular strain concentration in field joints, for concrete-covered pipelines during laying. A semi-analytical model, full-scale tests to verify the model, and results of a parameter study are described. The model is used to establish nonlinear moment-curvature curves at a number of cross sections on the concrete-coated pipe and in the field joint (FJ). These are used to establish a strain concentration factor (SCF) for the FJ, or characteristics for a varying stiffness model of a pipe for direct use in lay analyses. Constant moment, four-p

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Ptaszyński, Bogusław, Rafał Łuczak, Zbigniew Kuczera, and Piotr Życzkowski. "Influence of Local Gas Sources with Variable Density and Momentum on the Flow of the Medium in the Conduit." Energies 15, no. 16 (2022): 5834. http://dx.doi.org/10.3390/en15165834.

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In this article, the analysis of mechanical energy changes in a gas medium flow with stable and variable density was presented. To determine the energy losses, the various sources of momentum and mass were used, which had an influence on air flow through the conduit in the system without heat exchange with the environment. The occurrence of varying density gas flow in the conduit (caused by local inflow of mass and momentum) in inclined pipes generates a natural depression–internal mechanical energy. The local momentum sources can facilitate or hinder the gas flow through the conduit. This phe

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Skjelbreia, Lars. "THE CLAMP-ON WAVE FORCE METER." Coastal Engineering Proceedings 1, no. 7 (2011): 39. http://dx.doi.org/10.9753/icce.v7.39.

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Because of the tremendous increase in offshore activities, a great effort has been made on obtaining information on wave forces on structural members. Several oil companies have invested large sums of money in the design and construction of full-scale systems for measuring the wave forces. The equipment used for measuring the forces have been single cantilevers or segmented piles designed to make discrete measurements along the pile. For instance, during the last five years, The California Company and California Research Corporation (subsidiaries of Standard Oil Company of California) operated

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