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Journal articles on the topic 'Modeling of heat flows'

Author: Grafiati

Published: 30 May 2022

Last updated: 31 July 2025

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1

Chen, C. J., W. Lin, Y. Haik, and K. D. Carlson. "Modeling of complex flows and heat transfer." Journal of Visualization 1, no. 1 (1998): 51–63. http://dx.doi.org/10.1007/bf03182474.

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2

Peskova, E. E. "Numerical modeling of subsonic axisymmetric reacting gas flows." Journal of Physics: Conference Series 2057, no. 1 (2021): 012071. http://dx.doi.org/10.1088/1742-6596/2057/1/012071.

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Abstract A numerical algorithm is developed and implemented for modelling axisymmetric subsonic reacting gas flows based on a previously created program for plane flows. The system of Navier-Stokes equations in the low Mach number limit is used as a mathematical model. Calculations of ethane pyrolysis for axisymmetric and plane flow of mixture at heat supply from the reactor’s walls are carried out. Through the interplay of the developed code and the code for plane flows it becomes possible to identify the geometric factor role at the presence of a large number of nonlinear physicochemical pro

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3

Statharas, John C., John G. Bartzis, and Demosthenes D. Papailiou. "Heat Transfer Modeling in Low Flows and Application to Reflood Heat Transfer." Nuclear Technology 92, no. 2 (1990): 248–59. http://dx.doi.org/10.13182/nt90-a34476.

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4

Thakre, S. S., and J. B. Joshi. "CFD modeling of heat transfer in turbulent pipe flows." AIChE Journal 46, no. 9 (2000): 1798–812. http://dx.doi.org/10.1002/aic.690460909.

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5

Keyhani, M., and R. A. Polehn. "Finite Difference Modeling of Anisotropic Flows." Journal of Heat Transfer 117, no. 2 (1995): 458–64. http://dx.doi.org/10.1115/1.2822544.

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A modification to the finite difference equations is proposed in modeling multidimensional flows in an anisotropic material. The method is compared to the control volume version of the Taylor expansion and the finite element formulation derived from the Galerkin weak statement. For the same number of nodes, the proposed finite difference formulation approaches the accuracy of the finite element method. For the two-dimensional case, the effect on accuracy and solution stability is approximately the same as quadrupling the number of nodes for the Taylor expansion with only a proportionately smal

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6

Yao, Xiaobo, and André W. Marshall. "Quantitative Salt-Water Modeling of Fire-Induced Flows for Convective Heat Transfer Model Development." Journal of Heat Transfer 129, no. 10 (2007): 1373–83. http://dx.doi.org/10.1115/1.2754943.

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This research provides a detailed analysis of convective heat transfer in ceiling jets by using a quantitative salt-water modeling technique. The methodology of quantitative salt-water modeling builds on the analogy between salt-water flow and fire induced flow, which has been successfully used in the qualitative analysis of fires. Planar laser induced fluorescence and laser doppler velocimetry have been implemented to measure the dimensionless density difference and velocity in salt-water plumes. The quantitative salt-water modeling technique has been validated through comparisons of appropri

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7

Wood, Brian D., Xiaoliang He, and Sourabh V. Apte. "Modeling Turbulent Flows in Porous Media." Annual Review of Fluid Mechanics 52, no. 1 (2020): 171–203. http://dx.doi.org/10.1146/annurev-fluid-010719-060317.

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Turbulent flows in porous media occur in a wide variety of applications, from catalysis in packed beds to heat exchange in nuclear reactor vessels. In this review, we summarize the current state of the literature on methods to model such flows. We focus on a range of Reynolds numbers, covering the inertial regime through the asymptotic turbulent regime. The review emphasizes both numerical modeling and the development of averaged (spatially filtered) balances over representative volumes of media. For modeling the pore scale, we examine the recent literature on Reynolds-averaged Navier–Stokes (

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8

Soloveva, Olga, Sergei Solovev, Vyacheslav Kunitsky, Sergei Lukin, and Anton Sinitsyn. "Determination of the optimal heat exchanger configuration for wastewater heat recovery." E3S Web of Conferences 458 (2023): 01024. http://dx.doi.org/10.1051/e3sconf/202345801024.

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The work aims to increase the efficiency of the hot water supply system based on local recovery of the heat of wastewater generated in the shower room for preheating cold water. The work uses mathematical modeling of the thermal operation of the heat exchanger under study. Physical modeling of the heat exchange process between media flows in a heat exchanger was carried out (experimental test). Temperatures of media flows were measured. The temperature distribution inside media flows was compared experimentally with data obtained analytically. In conclusion, an analysis and generalization of t

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9

Hasan, A. R., and C. S. Kabir. "Modeling two-phase fluid and heat flows in geothermal wells." Journal of Petroleum Science and Engineering 71, no. 1-2 (2010): 77–86. http://dx.doi.org/10.1016/j.petrol.2010.01.008.

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10

Hachem, E., G. Jannoun, J. Veysset, et al. "Modeling of heat transfer and turbulent flows inside industrial furnaces." Simulation Modelling Practice and Theory 30 (January 2013): 35–53. http://dx.doi.org/10.1016/j.simpat.2012.07.013.

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11

Lobanov, I. E. "Modeling of intensified heat exchange in channels with diaphragms in laminar, transitional and turbulent regions for promising heat exchangers of rocket and space technology." Herald of Dagestan State Technical University. Technical Sciences 52, no. 1 (2025): 6–12. https://doi.org/10.21822/2073-6185-2025-52-1-6-12.

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Objective. The aim of the study is numerical low-Reynolds modeling of heat transfer in a pipe with protrusions of semicircular transverse profiles with Reynolds criteria characteristic of laminar, transitional and turbulent flows of coolants.Method. Implemented by the method (FCOM-om) in the article, both local and integral, both stationary and non-stationary characteristics of flow and heat transfer in a pipe with internal ribs were generated in transient and laminar flow modes of the coolant, which made it possible to determine for these modes the levels of heat transfer intensification, whi

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12

Zaichik, L. I., V. A. Pershukov, M. V. Kozelev, and A. A. Vinberg. "Modeling of dynamics, heat transfer, and combustion in two-phase turbulent flows: 2. Flows with heat transfer and combustion." Experimental Thermal and Fluid Science 15, no. 4 (1997): 311–22. http://dx.doi.org/10.1016/s0894-1777(96)00201-4.

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13

Rudnik, R. S., A. F. Matveev, and V. N. Kovalnogov. "Gas-Dynamic Temperature Stratification in the Leontiev Tube: Analytical Study and Numerical Modeling." Herald of Dagestan State Technical University. Technical Sciences 52, no. 1 (2025): 13–21. https://doi.org/10.21822/2073-6185-2025-52-1-13-21.

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Objective. The article is dedicated to the study of heat transfer processes in a Leontiev tube based on the principle of gas-dynamic temperature stratification. The objective of this work is to describe the mechanism of interaction between subsonic and supersonic flows and identify key parameters influencing stratification efficiency.Method. The study was conducted using an analytical approach and numerical modeling in the ANSYS Fluent environment. Temperature and velocity fields were visualized, and heat flow density was analyzed. The k−ω SST turbulence model was applied, enabling the conside

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14

Chung, Yongmann M., and Paul G. Tucker. "Assessment of Periodic Flow Assumption for Unsteady Heat Transfer in Grooved Channels." Journal of Heat Transfer 126, no. 6 (2004): 1044–47. http://dx.doi.org/10.1115/1.1833371.

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Numerical studies of unsteady heat transfer in grooved channel flows are made. The flows are of special relevance to electronic systems. Predictions suggest a commonly used periodic flow assumption (for modeling rows of similar electronic components) may not be valid over a significant system extent. It is found that the downstream flow development is strongly dependent on geometry.

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15

Zaichik, L. I., V. A. Pershukov, M. V. Kozelev, and A. A. Vinberg. "Modeling of dynamics, heat transfer, and combustion in two-phase turbulent flows: 1. Isothermal flows." Experimental Thermal and Fluid Science 15, no. 4 (1997): 291–310. http://dx.doi.org/10.1016/s0894-1777(97)00009-5.

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16

Hamidi, K., T. Rezoug, and S. Poncet. "Numerical Modeling of Heat Transfer in Taylor-Couette-Poiseuille Systems." Defect and Diffusion Forum 390 (January 2019): 125–32. http://dx.doi.org/10.4028/www.scientific.net/ddf.390.125.

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The purpose of this work is to model turbulent Taylor-Couette-Poiseuille flows submitted to a temperature gradient. These flows are relevant in many industrial applications including rotating machineries and more especially for the effective cooling of electric motors. Several turbulence closures (k-ω SST, RSM and LES) are first compared in the isothermal case and validated against the reliable experimental data of Escudier and Gouldson [1]. A detailed analysis of the coherent structures within the boundary layers is proposed. The model offering the best compromise between computational cost a

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17

Zhang, Yudong, Aiguo Xu, Feng Chen, Chuandong Lin, and Zon-Han Wei. "Non-equilibrium characteristics of mass and heat transfers in the slip flow." AIP Advances 12, no. 3 (2022): 035347. http://dx.doi.org/10.1063/5.0086400.

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Slip flow is a common phenomenon in micro-/nano-electromechanical systems. It is well known that the mass and heat transfers in slip flow show many unique behaviors, such as the velocity slip and temperature jump near the wall. However, the kinetic understanding of slip flow is still an open problem. This paper first clarifies that the Thermodynamic Non-Equilibrium (TNE) flows can be roughly classified into two categories: near-wall TNE flows and TNE flows away from the wall. The origins of TNE in the two cases are significantly different. For the former, the TNE mainly results from the fluid–

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18

Nagrani, Pranay P., Federico Municchi, Amy M. Marconnet, and Ivan C. Christov. "Two-fluid modeling of heat transfer in flows of dense suspensions." International Journal of Heat and Mass Transfer 183 (February 2022): 122068. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2021.122068.

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19

Tsui, Yeng-Yung, Shi-Wen Lin, and Kuen-Je Ding. "Modeling of Heat Transfer Across the Interface in Two-Fluid Flows." Numerical Heat Transfer, Part B: Fundamentals 66, no. 2 (2014): 162–80. http://dx.doi.org/10.1080/10407790.2014.894450.

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20

Yeoh, G. H., and J. Y. Tu. "Thermal-hydrodynamic modeling of bubbly flows with heat and mass transfer." AIChE Journal 51, no. 1 (2004): 8–27. http://dx.doi.org/10.1002/aic.10297.

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21

Fairuzov, Yuri V., and Hector Arvizu. "Numerical Solution for Transient Conjugate Two-Phase Heat Transfer With Heat Generation in the Pipe Wall." Journal of Heat Transfer 124, no. 6 (2002): 1213–18. http://dx.doi.org/10.1115/1.1470170.

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A method developed earlier for modeling conjugate two-phase heat transfer in flashing flows was used to obtain a numerical solution for transient boiling flow in heated pipes or channels. Two criteria of applicability of the solution obtained were proposed and numerically tested using a more rigorous model, which accounts for the effects of heat conduction with heat generation in the wall and forced convective boiling. The solution obtained provides a simple and reliable alternative to more rigorous methods for modeling transient two-phase flow in heated channels when the material of the wall

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22

Douaissia, Omar Hadj Aissa, Lysytsia Oleksii, Mykhailenko Taras, and Petukhov Ilya. "CFD MODELING OF MULTIPHASE FLOWS IN THE GAS TURBINE ENGINES OIL CAVITIES." Eastern-European Journal of Enterprise Technologies 2, no. 5 (104) (2020): 12–20. https://doi.org/10.15587/1729-4061.2020.198328.

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The choice of the structure of the mathematical model of thermal-hydraulic processes in the oil cavities of the GTE rotor supports has been substantiated. A three-dimensional CFD model has been built to calculate multiphase currents involving information on the flow distribution and heat exchange given in the scientific literature. We have considered the approaches and individual models used for these purposes. The resulting solutions are consistent with the results of the experiment on a model support and generally accepted ideas about the processes in a given class of devices. The distr

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23

Pinson, F., O. Gregoire, M. Quintard, M. Prat, and O. Simonin. "Modeling of turbulent heat transfer and thermal dispersion for flows in flat plate heat exchangers." International Journal of Heat and Mass Transfer 50, no. 7-8 (2007): 1500–1515. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2006.08.033.

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24

Ulybyshev, S. K., and B. A. Staroverov. "Imitation model of heat flows distribution in building heating control system." Vestnik IGEU, no. 2 (April 30, 2021): 70–79. http://dx.doi.org/10.17588/2072-2672.2021.2.070-079.

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Implementation of automatic heating control systems allows us to reduce heat consumption by 10% in residential areas and 40% in office and educational buildings. Currently, there are heating control systems, however, they are applied only to a single-level two-pipe heating system. Development of an imitation model of heat flows redistribution is necessary to synthesize the system of interconnected dynamic heating control of a building. Unlike existing solutions, this research work considers the problem of unbalanced heat flow in a multi-level hierarchical heating system. Calculation of convect

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25

Korbut, Vadum, and Serhii Rybachov. "THE EFFECT OF THE HEIGHT OF THE SIDES OF AN INDUSTRIAL BATH WITH A HEATED LIQUID ON THE PARAMETERS OF THE CONVECTIVE FLOW." Spatial development, no. 10 (November 29, 2024): 358–64. https://doi.org/10.32347/2786-7269.2024.10.358-364.

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To study the air-jet fence above the liquid mirror and design local exhaust ventilation systems for electroplating shops, it is proposed to use thermal models that replace sources of harmful vapors with equivalent heat-dissipating surfaces. The main goal of this approach is to determine the parameters of the heat flow formed above sources with side fences. When determining the real heat input from heat sources, the conditions of self-similarity of processes are applied in accordance with the principles of thermal modeling. This involves scaling the characteristics of convective flows (Q - heat

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26

Merala, Raymond, Mont Hubbard, and Takashi Miyano. "Modeling and Simulation of a Supercharger." Journal of Dynamic Systems, Measurement, and Control 110, no. 3 (1988): 316–23. http://dx.doi.org/10.1115/1.3152688.

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A dynamic model is developed for simulating and predicting performance for superchargers of relatively arbitrary geometric configuration. A thermodynamic control volume approach and bond graph models are used to derive continuity and energy equations linking the various control volumes. Bond graphs also serve to study and understand the causal implications of laws governing flows between control volumes and system dynamics. Heat transfer is neglected. Simulation outputs include time histories of pressure, temperature, mass, and energy associated with each control volume, time histories of the

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27

Fomichev, M. D., V. P. Zhukov, and M. V. Kozlova. "Study of wind speed influence on non-uniformity of air flow distribution in tower cooling towers." Vestnik IGEU, no. 6 (December 28, 2024): 75–80. https://doi.org/10.17588/2072-2672.2024.6.075-080.

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The shortage of sources of low-mineralized water in the areas of construction and operation of powerful power units of thermal power plants and nuclear power plants necessitates to increase the efficiency of circulating cooling systems. Under these conditions, water recycling systems with cooling towers play a key role, increasing efficiency of which by modeling and optimizing heat and mass transfer processes becomes an urgent task. Modeling of the movement of air flows in a cooling tower is carried out using a package in ANSYS Fluent. The water-cooling process, considering the found distribut

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28

Meziou, Amine, Zurwa Khan, Taoufik Wassar, Matthew A. Franchek, Reza Tafreshi, and Karolos Grigoriadis. "Dynamic Modeling of Two-Phase Gas/Liquid Flow in Pipelines." SPE Journal 24, no. 05 (2019): 2239–63. http://dx.doi.org/10.2118/194213-pa.

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Summary Presented is a reduced–order thermal fluid dynamic model for gas/liquid two–phase flow in pipelines. Specifically, a two–phase–flow thermal model is coupled with a two–phase–flow hydraulics model to estimate the gas and liquid properties at each pressure and temperature condition. The proposed thermal model estimates the heat–transfer coefficient for different flow patterns observed in two–phase flow. For distributed flows, where the two phases are well–mixed, a weight–based averaging is used to estimate the equivalent fluid thermal properties and the overall heat–transfer coefficient.

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29

Obukhov, A. G., and L. I. Maksimov. "Calculation of gas flow rates in concentrated fire vortices." Oil and Gas Studies, no. 5 (November 17, 2019): 108–14. http://dx.doi.org/10.31660/0445-0108-2019-5-108-114.

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The article presents the results of numerical simulation of the generation of free fire vortices in the laboratory without the use of special twisting devices. A. Yu. Varaksin, the corresponding member of the Russian Academy of Sciences, in his experimental studies has described the principal possibility of physical modeling of the occurrence of concentrated fire vortices. In the model of a compressible continuous medium for the complete system of Navier — Stokes equations, an initial-boundary value problem has been proposed that describes complex three-dimensional unsteady flows of a viscous

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30

Мартыненко, С. И. "On the approximation error in the problems of conjugate convective heat transfer." Numerical Methods and Programming (Vychislitel'nye Metody i Programmirovanie), no. 4 (September 10, 2019): 438–43. http://dx.doi.org/10.26089/nummet.v20r438.

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Рассмотрено влияние малых возмущений границы области на погрешность аппроксимации модельной краевой задачи. Показано, что игнорирование малых возмущений границы приводит к дополнительной погрешности аппроксимации исходной дифференциальной задачи, не связанной с шагом сетки. Полученные результаты представляют интерес для математического моделирования сопряженного теплообмена, моделирования течений с поверхностными химическими реакциями и других приложений, связанных с течениями рабочих сред вблизи шероховатых поверхностей. The effects of small boundary perturbation on the approximation error fo

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31

Shahbakhsh, Arash, and Astrid Nieße. "Modeling multimodal energy systems." at - Automatisierungstechnik 67, no. 11 (2019): 893–903. http://dx.doi.org/10.1515/auto-2019-0063.

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Abstract Information and communication technology (ICT) and the technology of coupling points including power-to-gas (PtG), power-to-heat (PtH) and combined heat and power (CHP) reshape future energy systems fundamentally. To study the resulting multimodal smart energy system, a proposed method is to separate the behavior of the component layer from the control layer. The component layer includes pipelines, power-lines, generators, loads, coupling points and generally all components through which energy flows. In the work at hand, a model is presented to analyze the operational behavior of the

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32

Alessandri, Angelo, Patrizia Bagnerini, Roberto Cianci, and Roberto Revetria. "Modeling and Estimation of Thermal Flows Based on Transport and Balance Equations." Advances in Mathematical Physics 2020 (February 1, 2020): 1–10. http://dx.doi.org/10.1155/2020/9621308.

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Heat transfer in counterflow heat exchangers is modeled by using transport and balance equations with the temperatures of cold fluid, hot fluid, and metal pipe as state variables distributed along the entire pipe length. Using such models, boundary value problems can be solved to estimate the temperatures over all the length by means of measurements taken only at the boundaries. Conditions for the stability of the estimation error given by the difference between the temperatures and their estimates are established by using a Lyapunov approach. Toward this end, a method to construct nonlinear L

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33

Farakhov, T. M., and A. G. Laptev. "Modeling of temperature profiles and efficiency of heat transfer equipment with intensifiers." Power engineering: research, equipment, technology 22, no. 2 (2020): 12–18. http://dx.doi.org/10.30724/1998-9903-2020-22-1-12-18.

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The problem of determination of temperature fields in the flow and efficiency of heat exchangers with intensification by metal chaotic packings is considered. Results of experimental studies of the heating of industrial oil with hot water in a "pipe-in-pipe" heat exchanger, where a chaotic packing of nominal size 6 mm is placed in the internal pipe, are presented. The packing, due to turbulence in the flow of oil, provides transition from the laminar to the turbulent regime and a significant increase in heat transfer coefficient (by 15-20 times). For calculating temperature profiles in channel

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34

Akin, Serhat. "Mathematical Modeling of Steam Assisted Gravity Drainage." SPE Reservoir Evaluation & Engineering 8, no. 05 (2005): 372–76. http://dx.doi.org/10.2118/86963-pa.

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Summary A mathematical model for gravity drainage in heavy-oil reservoirs and tar sands during steam injection in linear geometry is proposed. The mathematical model is based on the experimental observations that the steam-zone shape is an inverted triangle with the vertex fixed at the bottom production well. Both temperature and asphaltene content dependence on the viscosity of the drained heavy oil are considered. The developed model has been validated with experimental data presented in the literature. The heavy-oil production rate conforms well to previously published data covering a wide

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35

Cooper, Phillip S., James W. Leach, and Joseph N. Sinodis. "Modeling Fluid Flows and Heat Transfer in Industrial Processes Using Gothic Software." Energy Engineering 101, no. 5 (2004): 7–31. http://dx.doi.org/10.1080/01998590409509276.

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36

Askarova, A. S., S. A. Bolegenova, S. A. Bolegenova, V. Yu Maximov, and M. T. Beketayeva. "Modeling of Heat Mass Transfer in High-Temperature Reacting Flows with Combustion." High Temperature 56, no. 5 (2018): 738–43. http://dx.doi.org/10.1134/s0018151x1805005x.

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37

Choi, Yun-Ho. "Numerical modeling of heat and mass diffusion in compressible low speed flows." KSME International Journal 12, no. 5 (1998): 988–98. http://dx.doi.org/10.1007/bf02945566.

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Li, J., G. M. Campbell, and A. S. Mujumdar. "Discrete Modeling and Suggested Measurement of Heat Transfer in Gas–Solids Flows." Drying Technology 21, no. 6 (2003): 979–94. http://dx.doi.org/10.1081/drt-120021851.

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39

Muto, Daiki, Yu Daimon, Hideyo Negishi, and Taro Shimizu. "Wall modeling of turbulent methane/oxygen reacting flows for predicting heat transfer." International Journal of Heat and Fluid Flow 87 (February 2021): 108755. http://dx.doi.org/10.1016/j.ijheatfluidflow.2020.108755.

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40

Nagano, Y., and C. Kim. "A Two-Equation Model for Heat Transport in Wall Turbulent Shear Flows." Journal of Heat Transfer 110, no. 3 (1988): 583–89. http://dx.doi.org/10.1115/1.3250532.

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A new proposal for closing the energy equation is presented at the two-equation level of turbulence modeling. The eddy diffusivity concept is used in modeling. However, just as the eddy viscosity is determined from solutions of the k and ε equations, so the eddy diffusivity for heat is given as functions of temperature variance t2, and the dissipation rate of temperature fluctuations εt, together with k and ε. Thus, the proposed model does not require any questionable assumptions for the “turbulent Prandtl number.” Modeled forms of the t2 and εt equations are developed to account for the physi

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41

Jing Chen. "Unified Dynamic Simulation System for Multi-Energy Flows of Electricity, Heat, and Gas in Integrated Energy Systems." Journal of Electrical Systems 20, no. 3 (2024): 4936–46. http://dx.doi.org/10.52783/jes.6118.

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Integrated energy systems (IES) coordinate heterogeneous energy flows of electricity, heat, and gas to meet diverse load demands and enhance energy efficiency, is a new generation of energy systems that promote sustainable energy development. Simulation systems are essential tools for the analysis, control, and optimization of IES. However, due to the strong coupling of heterogeneous energy flows in IES, existing simulation software often lacks integration, typically focusing on electricity or relying on separate simulations of different energy flows. To address these challenges, this paper pr

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42

Narain, A. "Modeling of Interfacial Shear for Gas Liquid Flows in Annular Film Condensation." Journal of Applied Mechanics 63, no. 2 (1996): 529–38. http://dx.doi.org/10.1115/1.2788900.

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Internal flow of pure vapor experiencing film condensation on the walls of a straight horizontal duct is studied. The commonly occurring annular case of turbulent (or laminar) vapor flow in the core and laminar flow of the liquid condensate—with or without waves on the interface—is emphasized. We present a new methodology which models interfacial shear with the help of theory, computations, and reliable experimental data on heat transfer rates. The theory—at the point of onset of condensation—deals with issues of asymptotic form of interfacial shear, nonuniqueness of solutions, and selection o

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43

Spall, Robert E., Eugen Nisipeanu, and Adam Richards. "Assessment of a Second-Moment Closure Model for Strongly Heated Internal Gas Flows." Journal of Heat Transfer 129, no. 12 (2007): 1719–22. http://dx.doi.org/10.1115/1.2768098.

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Both low- and high-Reynolds-number versions of the stress-ω model of Wilcox (Turbulence Modeling for CFD, 2nd ed., DCW Industries, Inc.) were used to predict velocity and heat transfer data in a high-heat-flux cylindrical tube for which fluid properties varied strongly with temperature. The results indicate that for accurate heat transfer calculations under the conditions considered in this study, inclusion of low-Reynolds-number viscous corrections to the model are essential. The failure of the high-Reynolds-number model to accurately predict the wall temperature was attributed to an overpred

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44

Barochkin, Alexey. "Matrix Method for Modelling of Multicomponent and Multistream Energy Systems and Installations of Thermal Power Plants." Problems of the Regional Energetics, no. 4(52) (November 2021): 59–67. http://dx.doi.org/10.52254/1857-0070.2021.4-52.06.

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The aim of this work is to increase the operational efficiency of the multicomponent multithreaded power units and systems of the TPP using modeling, calculation and optimization. The goal is achieved by solving the following tasks: development of the tasks’ classification system and a unified methodology for the mathematical description of energy formation and mass flows’ processes in multicomponent and multithreaded power units of the TPP; development of a model of a steam turbine power unit; development of a model of heat and mass transfer processes in multi-stage multistream multiphase sys

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Tarasov, George, Konstantin Gyrnik, and Denis Leontev. "Parallel Algorithm for Modeling of Dynamic Processes in Porous Media." Advanced Materials Research 1040 (September 2014): 559–64. http://dx.doi.org/10.4028/www.scientific.net/amr.1040.559.

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Parallel algorithm for modeling the unsteady 2D gas flows through a porous media with energy sources is presented. A mathematical model of dynamic processes in porous heat-evolutional object is mentioned briefly. The structure of sequential algorithm and its parallel version is described in details. The performance and efficiency of parallel algorithm and its realization using OpenMP technology is evaluated.

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Taler, Dawid, Jan Taler, and Katarzyna Wrona. "Transient behavior of a plate-fin-and-tube heat exchanger taking into account different heat transfer coefficients on the individual tube rows." E3S Web of Conferences 137 (2019): 01036. http://dx.doi.org/10.1051/e3sconf/201913701036.

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Plate-fin and tube heat exchangers (PFTHE) are made of round, elliptical, oval or flat tubes to which continuous fins ( lamellas) are attached. Liquid flows inside the tubes and gas flows outside the tubes perpendicularly to their axes and parallel to the surface of continuous fins. Experimental studies of multi-row plate-fin and tube heat exchangers show that the highest average heat transfer coefficient on the air side occurs in the first row of tubes when the air velocity in front of the exchanger is less than approximately 3.5 m/s when a Reynolds number based on an equivalent hydraulic dia

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Nikulin, N. U., E. O. Sheremet, A. I. Alifanova, and V. A. Yakovlev. "Determining the geometry of the modified shape heat transfer surface in the shell-and-tube heat exchanger." Вестник гражданских инженеров 19, no. 6 (2022): 117–24. http://dx.doi.org/10.23968/1999-5571-2022-19-6-117-124.

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At present, much attention is paid to an important task in industry, namely, increasing the heat transfer coefficient of heat exchangers with smooth tubes. The article considers one of the techniques to increase the heat transfer coefficient between the heating and heated coolants in a shell-and-tube heat exchanger. The authors propose using the method of increasing the degree of turbulence of the coolant flow by equipping the plate with cylindrical ribs. The results of research carried out by the method of mathematical modeling in the ANSYS Fluent program are presented. Based on the results o

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Barannikova, D. D., and A. G. Obukhov. "MATHEMATICAL MODELING AND CALCULATION OF GAS DYNAMIC CHARACTERISTICS OF FREE THERMAL AIR VORTEX." Oil and Gas Studies, no. 4 (September 1, 2017): 93–98. http://dx.doi.org/10.31660/0445-0108-2017-4-93-98.

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The article analyzes experimental and analytical studies of ascending swirling air flows. In experimental works such flows are considered from the point of view of the direction of twist, the thermal regimes of heating the underlying surface, the estimation of integral parameters, the method of influence on them, and various methods of visualization. In analytical papers, by constructing solutions of the system of gas dynamics equations, the emergence of a twist of the corresponding direction is proven when there is a gas flow into a vertical cylinder of nonzero radius. In addition, in the num

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Alfonso, Gina, Stéphanie Laborie, and Corinne Cabassud. "Modeling of Integrated Hollow-Fiber Solar-Powered VMD Modules for Desalination for a Better Understanding and Management of Heat Flows." Membranes 14, no. 2 (2024): 50. http://dx.doi.org/10.3390/membranes14020050.

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The direct integration of membrane distillation and solar energy collection in a single module is a promising technology for autonomous seawater desalination in remote regions; however, the modeling and design of such modules are challenging because of the coupling of the radial and longitudinal heat and mass transfers. In a previous study, we provided as a first modeling approach a hollow fiber solar collector vacuum membrane distillation (VMD) module, considering a constant temperature at the shell side and a pure water feed. Here, a full model is developed to describe the coupled effects of

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Khaibullina, A. I., A. R. Khayrullin, and V. K. Ilyin. "Experimental study of oscillating flow in tube bundle." Vestnik IGEU, no. 6 (December 28, 2023): 29–37. http://dx.doi.org/10.17588/2072-2672.2023.6.029-037.

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Oscillating reciprocating flows are found in a variety of engineering applications. The mechanisms of oscillating flows have not been sufficiently studied. Oscillating flows can be created artificially to increase heat transfer equipment by intensifying heat transfer. Thus, this paper studies the flow and heat transfer characteristics of a tube bundle under the influence of oscillating flow. The assessment of heat transfer and the hydrodynamic flow pattern in a tube bundle during flow oscillations is carried out on the basis of experimental studies. Flow oscillations have been created by a pne

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