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In order to maximize the thermal efficiency of shell and coil heat exchangers, substantial research has been done and geometrical modification is one way to improve the exchange of thermal energy between two or more fluids. One of the peculiar features of coiled geometry is that the temperature distribution is highly variable along the circumferential section due to the centrifugal force induced in the fluid. Moreover, most researchers are concentrated on using a shell and single helical coil heat exchanger to enhance the heat transfer rate and thermal efficiency at different operating parameters. Therefore, the aim of this study is to investigate temperature variation ((T-1, T-2, T-3 and T-4) across a shell and single/double coil heat exchanger at different coil pitches, hot water flow rate, and cold-water flow rate along the outer surface of the coil using experimental and numerical analysis. For single and double coil heat exchangers, Computational Fluid Dynamics (CFD) is carried out using pure water with a hot water flow rate ranging between 1-2 l/min for the coil side heat exchanger. For single coil heat exchangers, the numerical analysis findings showed a good agreement with experimental four-temperature measurement results (T-1, T-2, T-3 and T-4) with an error rate of 1.80%, 3.05%, 5.34% and 2.17% respectively. Moreover, in the current double coil analysis, the hot outlet temperature decreased by 3.07% compared to a single coil (baseline case) at a 2.5L/min hot water flow rate. In addition, increasing the coil pitch will increase the contact between the hot fluid and the coil at a constant hot water flow rate and thereby decrease the hot fluid outlet temperature. Finally, a computational analysis was carried out to examine the flow structure inside single and double coil heat exchangers, and the findings indicated that the effect of centrifugal forces in double coil heat exchangers at various coil pitches caused the secondary flow to be substantially reduced.
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Никулин, Н., and Nikolay Nikulin. "THE STUDY OF HEAT TRANSFER IN INTENSIFIED SHELL AND TUBE DEVICE." Bulletin of Belgorod State Technological University named after. V. G. Shukhov 4, no. 4 (April 25, 2019): 77–82. http://dx.doi.org/10.34031/article_5cb1e65e6c0d28.53980880.
The use and prevalence of heat exchangers in Russian heat supply systems are considered. Attention is paid to the improvement of serial heat exchangers with smooth tubes – the increasing of heat transfer coefficient. One of the ways to increase the heat transfer coefficient is considered: it is the turbuliza-tion of the fluid flow on the heat exchange surface. The original design of the heat exchange surface for shell and tube devices of heat supply systems is presented. The dynamics of the heated fluid in the annular space of a shell and tube heat exchanger when flowing around the heat exchange surface with a modified geometry is studied (RF Patent 149737). A feature of the dynamics is a circular edge (element of the surface of heat exchange), which contributes to the creation of turbulence in the flow of the heated liquid on the plate and on the surface of the next edge. Emphasis is placed on heat ex-change processes between the solid surface of the edges and the heated fluid. For a circular cross sec-tion, the equation of thermal conductivity in cylindrical coordinates is compiled, taking into account the stationary heat exchange process, with an internal source of thermal energy. Solution of equation makes possible to determine the change in temperature on the surface and the average temperature of the edge. This value allows determining the Prandtl number to calculate the heat transfer coefficient.
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Aydin, Ahmet, Halit Yaşar, Tahsin Engin, and Ekrem Büyükkaya. "Optimization and CFD analysis of a shell-and-tube heat exchanger with a multi segmental baffle." Thermal Science, no. 00 (2020): 293. http://dx.doi.org/10.2298/tsci200111293a.
The Shell-and-tube type heat exchangers have long been widely used in many fields of industry. These types of heat exchangers are generally easy to design, manufacturing and maintenance, but require relatively large spaces to install. Therefore the optimization of such heat exchangers from thermal and economical points of view is of particular interest. In this article, an optimization procedure based on the minimum total cost (initial investment plus operational costs) has been applied. Then the flow analysis of the optimized heat exchanger has been carried out to reveal possible flow field and temperature distribution inside the equipment using computational fluid dynamics. The experimental results were compared with computational fluid dynamics analyses results. It has been concluded that the baffles play an important role in the development of the shell side flow field. This prompted us to investigate new baffle geometries without compromising from the overall thermal performance. It has been found that the heat exchanger with the new baffle design gives rise to considerably lower pressure drops in the shell side, which in turn reducing operating cost. The new baffle design is particularly well suited for shell-and-tube heat exchangers, where a viscous fluid flows through shell side with/out phase change.
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Walter, Christian, Sebastian Martens, Christian Zander, Carsten Mehring, and Ulrich Nieken. "Heat Transfer through Wire Cloth Micro Heat Exchanger." Energies 13, no. 14 (July 10, 2020): 3567. http://dx.doi.org/10.3390/en13143567.
The main objective of this study is to calculate and determine design parameters for a novel wire cloth micro heat exchanger. Wire cloth micro heat exchangers offer a range of promising applications in the chemical industry, plastics technology, the recycling industry and energy technology. We derived correlations to calculate the heat transfer rate, pressure drop and temperature distributions through the woven structure in order to design wire cloth heat exchangers for different applications. Computational Fluid Dynamics (CFD) simulations have been carried out to determine correlations for the dimensionless Euler and Nusselt numbers. Based on these correlations, we have developed a simplified model in which the correlations can be used to calculate temperature distributions and heat exchanger performance. This allows a wire cloth micro heat exchanger to be virtually designed for different applications.
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Kamidollayev, Tlegen, Juan Pablo Trelles, Jay Thakkar, and Jan Kosny. "Parametric Study of Panel PCM–Air Heat Exchanger Designs." Energies 15, no. 15 (July 30, 2022): 5552. http://dx.doi.org/10.3390/en15155552.
Heat exchangers, devices for the transfer of heat between two or more working fluids, are extensively used in cooling applications and heating applications. Heat exchangers in buildings are typically components of space-conditioning systems, as well as of water-heating applications. Heat exchangers are also sometimes used in applications that require storage and release of energy at specific times. Phase change materials (PCMs) enhance these heat-exchange processes, given their ability to melt and solidify at a fixed range of temperatures, absorbing or releasing significant amounts of latent heat. Five different configurations of PCM–air heat exchangers for thermal control in buildings are analyzed in this work. The heat exchangers were fitted with PCM encapsulated in plastic and composite pouches of various shapes, and packaged in stackable panel layers. Three-dimensional computational fluid dynamics (CFD) modeling of coupled incompressible fluid and conjugate heat transfer were performed on the designs. The phase change process was numerically modelled using the apparent heat capacity method. Steady-state CFD simulations provided quantification of pressure drop as a function of air flow velocity. Transient simulation results describe the thermal evolution of PCM in the pouches, helping to determine the best performing configuration with respect to total thermal charging time.
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Trokhaniak, V. I., I. L. Rogovskii, L. L. Titova, P. S. Popyk, O. O. Bannyi, and P. H. Luzan. "Computational fluid dynamics investigation of heat-exchangers for various air-cooling systems in poultry houses." Bulletin of the Karaganda University. "Physics" Series 97, no. 1 (March 30, 2020): 125–34. http://dx.doi.org/10.31489/2020ph1/125-134.
The increase in the productivity of poultry plants is connected with the necessity to create the optimal controlled environment in poultry houses. This problem is of prime importance due to the decrease of poultry plant productivity caused by the imperfection of the existing controlled environment systems. The paper presents the improved environment control system in a poultry house. The processes of heat- and mass-exchange in the developed heat-exchangers for various ventilation systems have been investigated. Computational Fluid Dynamics analysis of the heat-exchangers of two various designs for tunnel and side ventilation systems has been carried out. The fields of velocities, temperatures and pressures in the channels under study have been obtained. The conditions of a hydrodynamic flow in the channels have been analyzed. The intensity of heattransfer between a hot heat carrier and a cold one through their separating wall has been estimated. The most efficient heat-exchanging apparatus has been determined and the application potential of such a design has been substantiated. The aim of the research is the development and numerical modelling of a shell-and-tube heat-exchanger of a new design as an element of environment control system used in various types of ventilations systems in summer seasons.
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Fetuga, Ibrahim Ademola, Olabode Thomas Olakoyejo, Adeola S. Shote, Gbeminiyi Mike Sobamowo, Omotayo Oluwatusin, and Joshua Kolawole Gbegudu. "Thermal and Fluid Flow Analysis of Shell-and-Tube Heat Exchangers with Smooth and Dimpled Tubes." Journal of Advanced Engineering and Computation 6, no. 3 (September 30, 2022): 233. http://dx.doi.org/10.55579/jaec.202263.378.
This current work mainly focuses on the enhancement of the heat transfer and fluid flow characteristics of shell-and-tube heat exchangers by incorporating dimples on the smooth or conventional tubes. With the aid of the ANSYS (Fluent) commercial software package, Computational Fluid Dynamics (CFD) simulations under a steady-state condition were conducted on heat exchanger having a single shell and 12 tubes (with or without dimples), 50% baffle cut, 100mm baffle spacing and turbulent flow. The temperature, velocity, and pressure fields at the shell and tube zone in both cases are analyzed. The computational fluid dynamics results of the heat exchanger with dimpled tubes are compared with conventional (smooth) tubes. However, the results show that a shell and tube heat exchanger with dimpled tubes has a higher overall heat transfer coefficient than that of conventional (smooth) tubes. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium provided the original work is properly cited.
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Hughes, J. P., T. E. R. Jones, and P. W. James. "Numerical Simulations and Experimental Measurements of the Isothermal Flow in a Model Tubular Heat Exchanger." Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering 220, no. 2 (May 1, 2006): 109–19. http://dx.doi.org/10.1243/095440806x78847.
This paper describes numerical simulations and experimental measurements of isothermal laminar flow on the shell side of a model tubular heat exchanger, for both Newtonian and non-Newtonian fluids. Commercially available computational fluid dynamics software is used for the simulations, which are shown to be in good agreement with experimental measurements of shear rate and pressure drop. The simulations can then be used to provide a detailed description of the laminar shell-side flow in the model tubular heat exchanger. The motivation for this work stems from interest in the food processing industry in using tubular heat exchangers in heat recovery mode for medium viscosity food products. In this mode, the food product flows on the shell side as well as through the tubes. The shell-side flow is then laminar and aspects of the performance of the heat exchanger may be unsatisfactory. The work described in this paper forms part of a wider study in which validated numerical simulations are used in the design of tubular heat exchangers operating in heat recovery mode for medium viscosity food products.
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Sundén, Bengt. "Computational Fluid Dynamics in Research and Design of Heat Exchangers." Heat Transfer Engineering 28, no. 11 (November 2007): 898–910. http://dx.doi.org/10.1080/01457630701421679.
Purpose The purpose of this study is to find the thermo-hydraulic performances of compact heat exchangers (CHE’s), which are strongly depending upon the prediction of performance of various types of heat transfer surfaces such as offset strip fins, wavy fins, rectangular fins, triangular fins, triangular and rectangular perforated fins in terms of Colburn “j” and Fanning friction “f” factors. Design/methodology/approach Numerical methods play a major role for analysis of compact plate-fin heat exchangers, which are cost-effective and fast. This paper presents the on-going research and work carried out earlier for single-phase steady-state heat transfer and pressure drop analysis on CHE passages and fins. An analysis of a cross-flow plate-fin compact heat exchanger, accounting for the individual effects of two-dimensional longitudinal heat conduction through the exchanger wall, inlet fluid flow maldistribution and inlet temperature non-uniformity are carried out using a Finite Element Method (FEM). Findings The performance deterioration of high-efficiency cross-flow plate-fin compact heat exchangers have been reviewed with the combined effects of wall longitudinal heat conduction and inlet fluid flow/temperature non-uniformity using a dedicated FEM analysis. It is found that the performance deterioration is quite significant in some typical applications due to the effects of wall longitudinal heat conduction and inlet fluid flow non-uniformity on cross-flow plate-fin heat exchangers. A Computational Fluid Dynamics (CFD) program FLUENT has been used to predict the design data in terms of “j” and “f” factors for plate-fin heat exchanger fins. The suitable design data are generated using CFD analysis covering the laminar, transition and turbulent flow regimes for various types of fins. Originality/value The correlations for the friction factor “f” and Colburn factor “j” have been found to be good. The correlations can be used by the heat exchanger designers and can reduce the number of tests and modification of the prototype to a minimum for similar applications and types of fins.
Dissertations / Theses on the topic "Heat exchangers Fluid dynamics":
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Mavi, Anele. "Computational analysis of viscoelastic fluid dynamics with applications to heat exchangers." Master's thesis, Faculty of Science, 2019. http://hdl.handle.net/11427/30078.
In this study, the computational analysis of a pressure driven viscoelastic fluid in a double pipe heat exchanger set-up is investigated. Non-Newtonian viscoelastic fluids in heat exchanger arrangements are encountered in various industrial applications such as power generation, refrigeration and in the food processing industry where the need for cooling and heating of liquids is required. The model problem is governed by complex, non-linear and coupled partial differential equations. These are solved using the semi-implicit finite difference method integrated with the Crank-Nicolson scheme. The pressure-velocity coupling in the momentum equations is resolved by employing the Semi-Implicit Method for Pressure Linked Equations (SIMPLE). To cope with numerical diffusion and numerical stability issues the treatment of convective terms using the upwind schemes is explored. In this work, the behaviour of viscoelastic fluids is rigorously examined by analysing the convective heat transfer from the viscoelastic core fluid of the double pipe heat exchanger to the Newtonian or viscoelastic shell fluid in the outer annulus. In addition, the effects of pressure, momentum, extra stresses, temperature, viscosity and relaxation time on the fluid temperature are investigated; both in the counter flow and parallel flow configurations. Graphical computational results are presented and discussed quantitatively and qualitatively with respect to several parameters involved in the problem.
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Piper, Mark [Verfasser]. "Analysis of fluid dynamics and heat transfer in pillow-plate heat exchangers / Mark Piper." Paderborn : Universitätsbibliothek, 2018. http://d-nb.info/1168721474/34.
Bruzzano, Marco Anthony. "Investigation of a self compensating flow distribution system." Thesis, Georgia Institute of Technology, 1990. http://hdl.handle.net/1853/19284.
Chen, Li-Kwen. "Unsteady flow and heat transfer in periodic complex geometries for the transitional flow regime." Diss., Rolla, Mo. : Missouri University of Science and Technology, 2008. http://scholarsmine.mst.edu/thesis/pdf/Chen_09007dcc804bed71.pdf.
Thesis (Ph. D.)--Missouri University of Science and Technology, 2008. Vita. The entire thesis text is included in file. Title from title screen of thesis/dissertation PDF file (viewed May 12, 2008) Includes bibliographical references.
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Walker, Patrick Gareth Chemical Engineering & Industrial Chemistry UNSW. "CFD modeling of heat exchange fouling." Awarded by:University of New South Wales. Chemical Engineering & Industrial Chemistry, 2005. http://handle.unsw.edu.au/1959.4/22385.
Heat exchanger fouling is the deposition of material onto the heat transfer surface causing a reduction in thermal efficiency. A study using Computational Fluid Dynamics (CFD) was conducted to increase understanding of key aspects of fouling in desalination processes. Fouling is a complex phenomenon and therefore this numerical model was developed in stages. Each stage required a critical assessment of each fouling process in order to design physical models to describe the process???s intricate kinetic and thermodynamic behaviour. The completed physical models were incorporated into the simulations through employing extra transport equations, and coding additional subroutines depicting the behaviour of the aqueous phase involved in the fouling phenomena prominent in crystalline streams. The research objectives of creating a CFD model to predict fouling behaviour and assess the influence of key operating parameters were achieved. The completed model of the key crystallisation fouling processes monitors the temporal variation of the fouling resistance. The fouling rates predicted from these results revealed that the numerical model satisfactorily reproduced the phenomenon observed experimentally. Inspection of the CFD results at a local level indicated that the interface temperature was the most influential operating parameter. The research also examined the likelihood that the crystallisation and particulate fouling mechanisms coexist. It was found that the distribution of velocity increased the likelihood of the particulate phase forming within the boundary layer, thus emphasizing the importance of differentiating between behaviour within the bulk and the boundary layer. These numerical results also implied that the probability of this composite fouling was greater in turbulent flow. Finally, supersaturation was confirmed as the key parameter when precipitation occurred within the bulk/boundary layer. This investigation demonstrated the advantages of using CFD to assess heat exchanger fouling. It produced additional physical models which when incorporated into the CFD code adequately modeled key aspects of the crystallisation and particulate fouling mechanisms. These innovative modelling ideas should encourage extensive use of CFD in future fouling investigations. It is recommended that further work include detailed experimental data to assist in defining the key kinetic and thermodynamic parameters to extend the scope of the required physical models.
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Ozden, Ender. "Detailed Design Of Shell-and-tube Heat Exchangers Using Cfd." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/3/12608752/index.pdf.
Traditionally Shell-and-tube heat exchangers are designed using correlation based approaches like Kern method and Bell-Delaware method. With the advances in Computational Fluid Dynamics (CFD) software, it is now possible to design small heat exchangers using CFD. In this thesis, shell-and-tube heat exchangers are modeled and numerically analyzed using a commercial finite volume package. The modeled heat exchangers are relatively small, have single shell and tube passes. The leakage effects are not taken into account in the design process. Therefore, there is no leakage from baffle orifices and no gap between baffles and the shell. This study is focused on shell side flow phenomena. First, only shell side is modeled and shell side heat transfer and flow characteristics are analyzed with a series of CFD simulations. Various turbulence models are tried for the first and second order discretization schemes using different mesh densities. CFD predictions of the shell side pressure drop and the heat transfer coefficient are obtained and compared with correlation based method results. After selecting the best modeling approach, the sensitivity of the results to the flow rate, the baffle spacing and baffle cut height are investigated. Then, a simple double pipe heat exchanger is modeled. For the double pipe heat exchanger, both the shell (annulus) side and the tube side are modeled. Last, analyses are performed for a full shell-and-tube heat exchanger model. For that last model, a small laminar educational heat exchanger setup is used. The results are compared with the available experimental results obtained from the setup. Overall, it is observed that the flow and temperature fields obtained from CFD simulations can provide valuable information about the parts of the heat exchanger design that need improvement. The correlation based approaches may indicate the existence of a weakness in design, but CFD simulations can also pin point the source and the location of the weakness.
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Peronski, Lukasz. "Application of computational fluid dynamics in the design of heat exchangers for domestic central heating boilers." Thesis, University of Leeds, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.612612.
The aim of this study is to investigate the possible use of commercial Computational Fluid Dynamics (CFD) software in the design process of a heat exchanger for a domestic gas boiler. Fluid flow and heat transfer CFD simulations have been performed and validated. In general, a good agreement between the CFD simulations and the experimental results was observed. The porous media approach was used for approximating the water flow resistance characteristics in the sections of the heat exchanger in the flow distribution problems. This was in cases in which the direct CFD simulations of the water flow through these sections of the heat exchanger would require very large numerical meshes and computational resources. Also a method for designing a water flow distributor for the sectional parallel now heat exchanger is proposed. The method is based on Bernoulli's equation with the flow resistance characteristics of a single section of the heat exchanger gained from the CFD simulation of the water now through a single section of this heat exchanger. The performed CFD analyses provide very useful information with regards to the operational parameters and conditions in the heat exchanger under investigation, which would otherwise be very difficult. if not impossible, to obtain. Despite the great potential usefulness of the CFD simulation In the design process of heat exchangers, it is still not always considered a clear choice for use in the boiler industry, in order to aid the design process of heat exchangers for domestic central heating boilers. This is due to the relatively high cost of the CFD analyses and the fact that the boiler industry traditionally relies on design procedures based primarily on experimental techniques
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Vaitekunas, David A. "A generic dynamic model for crossflow heat exchangers with one fluid mixed /." Thesis, McGill University, 1990. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=59591.
This thesis presents a generic model for crossflow heat exchangers with one fluid mixed, suitable for dynamic process simulation. A finite difference technique is used to formulate the coupled flow and energy solutions for arbitrary transients in pressure drop and temperature. The solution algorithms are presented in two forms: one-way dependence and two-way dependence: for the constant and variable property version of the model, respectively. Variable time step algorithms are also developed to predict the optimal time step for the finite difference solution. The first one uses a first order predictor method and the second one uses a combined first/second order predictor method. Finally, the generic model is configured to model the economizer and tubular air preheater of an existing boiler. Steady-state tests validate the numerical solution against available theoretical relations and transient tests investigate the parameters in the solution and time step algorithms to determine their effect on simulation speed and accuracy.
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Dimas, Sotirios. "A CFD analysis of the performance of pin-fin laminar flow micro/meso scale heat exchangers." Thesis, Monterey, Calif. : Naval Postgraduate School, 2005. http://bosun.nps.edu/uhtbin/hyperion-image.exe/05Sep%5FDimas.pdf.
Thesis (Mechanical Engineer and M.S. in Mechanical Engineering)--Naval Postgraduate School, September 2005. Thesis Advisor(s): Gopinath, Ashok ; Sinibaldi, Jose O. "September 2005." Description based on title screen as viewed on March 12, 2008. Includes bibliographical references (p. 85-87). Also available in print.
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Taylor, Creed. "Measurement of Finned-Tube Heat Exchanger Performance." Thesis, Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/4890.
Finned-tube heat exchangers are predominantly used in space conditioning systems, as well as other applications requiring heat exchange between two fluids. One important widespread use is in residential air conditioning systems. These residential cooling systems influence the peak demand on the U.S. national electrical system, which occurs on the hot summer afternoons, and thereby sets the requirement for the expensive infrastructure requirement of the nations power plant and electrical distribution system. In addition to this peak demand, these residential air conditioners are major energy users that dominate residential electrical costs and environmental impact.
The design of finned-tube heat exchangers requires the selection of over a dozen design parameters by the designer. The refrigerant side flow and heat transfer characteristics inside the tubes have been thoroughly studied. However, the air side flow around the tube bundle and through the fin gaps is much more complex and depends on over a dozen design parameters. Therefore, experimental measurement of the air side performance is needed.
First this study built an experimental system and developed methodology for measuring the air side heat transfer and pressure drop characteristics of fin tube heat exchangers. This capability was then used to continue the goal of expanding and clarifying the present knowledge and understanding of air side performance to enable the air conditioner system designer in verifying an optimum fin tube condenser design.
In this study eight fin tube heat exchangers were tested over an air flow face velocity range of 5 ?? ft/s (675-1600cfm). The raw data were reduced to the desired heat transfer and friction data, j and f factors. This reduced heat transfer and friction data was plotted versus Reynolds number and compared. The effect of fin spacing, the number of rows and fin enhancement were all investigated. The heat transfer and friction data were also plotted and compared with various correlations available from open literature. The overall accuracy of each correlation to predict experimental data was calculated. Correlations by C.C. Wang (1998b, 1999) showed the best agreement with the data. Wangs correlations (1998b, 1999) were modified to fit the current studys data.
American Society of Mechanical Engineers. Winter Meeting. Thermal hydraulics of advanced heat exchangers: Presented at the Winter Annual Meeting of the American Society of Mechanical Engineers, Dallas, Texas, November 25-30, 1990. New York, N.Y: ASME, 1990.
National Heat Transfer Conference (24th 1987 Pittsburgh, Pa.). Maldistribution of flow and its effect on heat exchanger performance: Presented at the 24th National Heat Transfer Conference and Exhibition, Pittsburgh, Pennsylvania, August 9-12, 1987. New York, N.Y. (345 E. 47th St., New York 10017): American Society of Mechanical Engineers, 1987.
Pettigrew, M. J. Flow-induced vibration specifications for steam generators and liquid heat exchangers. Chalk River, Ont: Chalk River Laboratories, 1995.
Sundén, Bengt. "Convective Heat Transfer and Fluid Dynamics in Heat Exchanger Applications." In Applied Optical Measurements, 159–70. Berlin, Heidelberg: Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/978-3-642-58496-1_10.
Gora, Vikash, and M. Mohan Jagadeesh Kumar. "Design Fabrication and Testing of a Heat Exchanger in a Solar Thermal Energy Conversion System." In Advances in Fluid Dynamics, 537–47. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-4308-1_42.
Huang, Yuan Mao. "Study of Unsteady Flow in the Heat Exchanger by the Method of Characteristics." In Recent Advances in Computational Fluid Dynamics, 454–83. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/978-3-642-83733-3_18.
Sethuramalingam, Ramamoorthy, and Abhishek Asthana. "Design Improvement of Water-Cooled Data Centres Using Computational Fluid Dynamics." In Springer Proceedings in Energy, 105–13. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-63916-7_14.
AbstractData centres are complex energy demanding environments. The number of data centres and thereby their energy consumption around the world is growing at a rapid rate. Cooling the servers in the form of air conditioning forms a major part of the total energy consumption in data centres and thus there is an urgent need to develop alternative energy efficient cooling technologies. Liquid cooling systems are one such solution which are in their early developmental stage. In this article, the use of Computational Fluid Dynamics (CFD) to further improve the design of liquid-cooled systems is discussed by predicting temperature distribution and heat exchanger performance. A typical 40 kW rack cabinet with rear door fans and an intermediate air–liquid heat exchanger is used in the CFD simulations. Steady state Reynolds-Averaged Navier–Stokes modelling approach with the RNG K-epsilon turbulence model and the Radiator boundary conditions were used in the simulations. Results predict that heat exchanger effectiveness and uniform airflow across the cabinet are key factors to achieve efficient cooling and to avoid hot spots. The fundamental advantages and limitations of CFD modelling in liquid-cooled data centre racks were also discussed. In additional, emerging technologies for data centre cooling have also been discussed.
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Nandagopal, PE, Nuggenhalli S. "Heat Exchangers." In Fluid and Thermal Sciences, 247–91. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-93940-3_12.
Rodríguez-Vázquez, M., I. Hernández-Pérez, J. Xamán, Y. Chávez, and F. Noh-Pat. "Computational Fluid Dynamics for Thermal Evaluation of Earth-to-Air Heat Exchanger for Different Climates of Mexico." In CFD Techniques and Thermo-Mechanics Applications, 33–51. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-70945-1_3.
Conference papers on the topic "Heat exchangers Fluid dynamics":
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COUSINS, A. "Response of laser heat exchangers to unsteady spatially-varying input." In 21st Fluid Dynamics, Plasma Dynamics and Lasers Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1990. http://dx.doi.org/10.2514/6.1990-1507.
Abeykoon, Chamil. "Modelling of Heat Exchangers with Computational Fluid Dynamics." In 8th International Conference on Fluid Flow, Heat and Mass Transfer (FFHMT'21). Avestia Publishing, 2021. http://dx.doi.org/10.11159/ffhmt21.127.
Antao, Dion Savio, and Bakhtier Farouk. "Computational Fluid Dynamics Simulations of an Inertance Type Pulse Tube Refrigerator." In ASME 2010 International Mechanical Engineering Congress and Exposition. ASMEDC, 2010. http://dx.doi.org/10.1115/imece2010-39099.
A numerical study is reported here for the investigation of the fundamental flow and heat transfer processes found in an inertance type pulse tube refrigerator (IPTR). The general design of an IPTR incorporates a pressure wave generator, a transfer line, an aftercooler, a regenerator, a pulse tube, a pair of heat exchangers for the cold and hot ends of the pulse tube, an inertance tube and a reservoir. The performance of the IPTR system is simulated using computational fluid dynamics (CFD) using cylindrical co-ordinates (r–z) and applying the axisymmetric assumption. The IPTR is driven by a cyclically moving piston at one end of the system operating at a fixed frequency with helium as the working fluid. Both constant temperature and convective heat transfer boundary conditions are examined along the external walls of the hot heat exchangers. The simulations reveal interesting steady-periodic flow patterns that develop in the pulse tube due to the fluctuations caused by the piston and the presence of the inertance tube. The secondary-flow recirculation patterns in the pulse tube reduce the heat pumping effect from the low-temperature heat exchanger to the high-temperature heat exchangers.
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Soojin Jun and V. M. Puri. "3D Milk Fouling Model of Plate Heat Exchangers using Computational Fluid Dynamics." In 2005 Tampa, FL July 17-20, 2005. St. Joseph, MI: American Society of Agricultural and Biological Engineers, 2005. http://dx.doi.org/10.13031/2013.19600.
Thompson, Willis H., Srinath V. Ekkad, C. Guney Olgun, and Joseph Wheeler. "Numerical Modeling of Fluid Flow and Thermal Behavior in Geothermal Heat Exchangers." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-65098.
Geothermal heat exchangers are highly dependent on the local heat exchange capacity and ground thermal properties. The ability to simulate performance and testing of geothermal heat exchangers is limited. Therefore thermal conductivity tests are usually required for correct sizing of geothermal heat exchange systems. To better understand these tests in relation to energy piles, a 3D finite element model was created using the COMSOL software to simulate the thermal conductivity test of a 12inch (30cm) energy pile. The finite element simulation was created and validated using experimental data to expand the comparisons made between geothermal boreholes and energy piles. In this study, the numerical finite element model has been recreated using the commercial computational fluid dynamics (CFD) software ANSYS which incorporates fluid flow effects. Confirming that the CFD model can accurately model the thermal conductivity test provides an additional tool that will be valuable in modeling geothermal heat exchangers. Results show that parametric variations in terms of fluid flow rate and fluid selection are easier to evaluate using the CFD model compared to the finite element model. Results are also compared with discrete thermal conductivity measurements obtained from real geothermal heat exchangers.
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Patterson, Michael K., Xiaojin Wei, and Yogendra Joshi. "Use of Computational Fluid Dynamics in the Design and Optimization of Microchannel Heat Exchangers for Microelectronics Cooling." In ASME 2005 Summer Heat Transfer Conference collocated with the ASME 2005 Pacific Rim Technical Conference and Exhibition on Integration and Packaging of MEMS, NEMS, and Electronic Systems. ASMEDC, 2005. http://dx.doi.org/10.1115/ht2005-72647.
Increasing circuit density and adherence to Moore’s law is driving advanced cooling systems for the next generation microprocessors. One method receiving considerable study is that of microchannel heat exchangers in silicon substrate. These very fine channels in the heat exchanger provide a greatly enhanced convective heat transfer rate and have been shown to be able to meet the demands of the cooling challenge for microprocessors for many generations to come. While the thermal performance has been demonstrated, the design methodology and analysis for fluid structures at this size scale remains difficult. This paper reviews the use of CFD analysis for the design and optimization of microchannel heat exchangers. These results are compared with classical approaches to the same design and demonstrate the need for CFD analysis. Errors using the standard correlations and methods are demonstrated through the results of an optimization study on microchannels. The effects of entrance lengths, spatial variation of the Nusselt number, and temperature dependencies are considered. The literature has widely varying reports on comparisons between experimental results and corresponding theoretical results in microchannel heat exchangers. Experimental validation of the CFD analysis has also been performed and demonstrates that current CFD techniques are actually well suited to heat exchanger designs of this size.
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Gao, Tianyi, Bahgat Sammakia, James Geer, Milnes David, and Roger Schmidt. "Experimentally Verified Transient Models of Data Center Crossflow Heat Exchangers." In ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-36022.
Heat exchangers are key components that are commonly used in data center cooling systems. Rear door heat exchangers, in-row coolers, overhead coolers and fully contained cabinets are some examples of liquid and hybrid cooling systems used in data centers. A liquid to liquid heat exchanger is one of the main components of the Coolant Distribution Unit (CDU), which supplies chilled water to the heat exchangers mentioned above. Computer Room Air Conditioner (CRAC) units also consist of liquid to air cross flow heat exchangers. Optimizing the energy use and the reliability of IT equipment in data centers requires Computational Fluid Dynamics (CFD) tools that can accurately model data centers for both the steady state and dynamic operations. Typically, data centers operate in dynamic conditions due to workload allocations that change both spatially and temporally. Additional dynamic situations may also arise due to failures in the thermal management and electrical distribution systems. In the computational simulation, individual component models, such as transient heat exchanger models, are therefore needed. It is also important to develop simple, yet accurate, compact models for components, such as heat exchangers, to reduce the computational time without decreasing simulation accuracy. In this study, a method for modeling compact transient heat exchangers using CFD code is presented. The method describes an approach for installing thermal dynamic heat exchanger models in CFD codes. The transient effectiveness concept and model are used in the development of the methodology. Heat exchanger CFD compact models are developed and tested by comparing them with full thermal dynamic models, and also with experimental measurements. The transient responses of the CFD model are presented for step and ramp change in flow rates of the hot and cold fluids, as well as step, ramp, and exponential variation in the inlet temperature. Finally, some practical dynamic scenarios involving IBM buffer liquid to liquid heat exchanger, rear door heat exchanger, and CRAC unit, are parametrically modeled to test the developed methodology. It is shown that the compact heat exchanger model can be used to successfully predict dynamic scenarios in typical data centers.
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Wang, Aihua, Samir F. Moujaes, Yitung Chen, and Valery Ponyavin. "Experimental and Numerical Analyses of Friction Factors in Offset Strip Fin Heat Exchangers." In ASME/JSME 2007 5th Joint Fluids Engineering Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/fedsm2007-37482.
Heat transfer in compact heat exchangers is augmented by the introduction of the offset strip fins. With the breakdown of the thermal and hydro boundary layers to boost heat transfer, the fins increase the friction power. Two heat exchangers of different fin geometries structures were built and tested. The results of the study show that the round-edge-fin heat exchanger has the smaller friction factor. A test rig was constructed to measure the friction factor of the offset strip fin heat exchangers with air. A modified hydraulic diameter was used to calculate the main parameters. The computational fluid dynamics package FLUENT was used to predict the flow in the heat exchanger. The numerical investigation was conducted and compared with experimental measurements.
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Robb, K., M. Delgado, T. Howard, and N. Goth. "Molten Salt Air-Cooled Heat Exchanger Fluid Dynamics." In 2020 ANS Virtual Winter Meeting. AMNS, 2020. http://dx.doi.org/10.13182/t123-33521.
Nagar, R. K., J. P. Meyer, Md MahbubAlam, and G. Spedding. "Fluid Dynamics Around a Dimpled Pin-Fin." In ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-63427.
The most common and popular cooling mechanism found in various industrial applications is pin-fins. These industrial applications include cooling of heat exchangers, as well as the cooling of micro electronic equipment. With the increased heat output of these devices, new enhancement techniques have been investigated. A surface enhancement technique of using offset shallow dimples on pin-fins was found to increase the heat transfer rate by up to 30%. The insight into the mechanism is, however, not known in fluid dynamics. A numerical investigation is conducted to get insight into the mechanism, comparing fluid dynamics around a single smooth cylinder with that around a dimpled cylinder.
Reports on the topic "Heat exchangers Fluid dynamics":
1
Rodriguez, Salvador. Computational Fluid Dynamics and Heat Transfer Modeling of a Dimpled Heat Exchanger. Office of Scientific and Technical Information (OSTI), October 2022. http://dx.doi.org/10.2172/1893993.
Uvan Catton, Vijay K. Dhir, Deepanjan Mitra, Omar Alquaddoomi, and Pierangelo Adinolfi. Development of Design Criteria for Fluid Induced Structural Vibrations in Steam Generators and Heat Exchangers. Office of Scientific and Technical Information (OSTI), April 2004. http://dx.doi.org/10.2172/827838.
Catton, Ivan, Vijay K. Dhir, O. S. Alquaddoomi, Deepanjan Mitra, and Pierangelo Adinolfi. Development of Design Criteria for Fluid Induced Structural Vibration in Steam Generators and Heat Exchangers. Office of Scientific and Technical Information (OSTI), March 2004. http://dx.doi.org/10.2172/822365.
Blackwell, B. F., R. J. Cochran, R. E. Hogan, P. A. Sackinger, and P. R. Schunk. Moving/deforming mesh techniques for computational fluid dynamics and heat transfer. Office of Scientific and Technical Information (OSTI), December 1996. http://dx.doi.org/10.2172/419077.
Abadie, Marc O., Elizabeth U. Finlayson, and Ashok J. Gadgil. Infiltration heat recovery in building walls: Computational fluid dynamics investigations results. Office of Scientific and Technical Information (OSTI), August 2002. http://dx.doi.org/10.2172/803859.
Panicker, Nithin, Marco Delchini, Thomas Sambor, and Adrian Sabau. COMPUTATIONAL FLUID DYNAMICS SIMULATIONS TO PREDICT OXIDATION IN HEAT RECOVERY STEAM GENERATOR TUBES. Office of Scientific and Technical Information (OSTI), March 2022. http://dx.doi.org/10.2172/1888933.
Tzanos, C. P., and B. Dionne. Computational fluid dynamics analyses of lateral heat conduction, coolant azimuthal mixing and heat transfer predictions in a BR2 fuel assembly geometry. Office of Scientific and Technical Information (OSTI), May 2011. http://dx.doi.org/10.2172/1018507.
Robert E. Spall, Barton Smith, and Thomas Hauser. validation and Enhancement of Computational Fluid Dynamics and Heat Transfer Predictive Capabilities for Generation IV Reactor Systems. Office of Scientific and Technical Information (OSTI), December 2008. http://dx.doi.org/10.2172/944056.
