Artigos de revistas: "Conjugated heat transfers"

1

Stiti, M., A. Labergue, F. Lemoine e G. Castanet. "Reconstruction of The Ice Front Within an Icing Droplet Using High Speed Laser Induced Fluorescence Imaging". Proceedings of the International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics 20 (11 de julho de 2022): 1–10. http://dx.doi.org/10.55037/lxlaser.20th.157.

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An experimental setup is implemented in order to study the solidification of a drop impinging a subcooled substrate. One of the major problems relying the study of droplet solidification consist of the visualization of the solidification front within the droplet. Indeed, shadowgraphy measurement only allows the observation of the solidification front along the tri-junction liquid/solid/air. The use of the Laser Induced Fluorescence provides information on the evolution of the horizontal solidification front in a droplet over t ime. The images reconstruction of the solidification front is made by using two high-speed cameras (side view and top view). The measurements allow for the first time to observe the evolution of the solidification front geometry over t ime. The measurements, carried out on a duralumin substrate, were then compared with a 2D numerical model taking into account the heat transfers conjugated with the substrate.

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Joneydi, Shariatzadeh. "Analytical solution of conjugate turbulent forced convection boundary layer flow over plates". Thermal Science 20, n.º 5 (2016): 1499–507. http://dx.doi.org/10.2298/tsci140115062j.

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A conjugate (coupled) forced convection heat transfer from a heated conducting plate under turbulent boundary layer flow is considered. A heated plate of finite thickness is cooled under turbulent forced convection boundary layer flow. Because the conduction and convection boundary layer flow is coupled (conjugated) in the problem, a semi-analytical solution based on Differential Transform Method (DTM) is presented for solving the non-linear integro-differential equation occurring in the problem. The main conclusion is that in the conjugate heat transfer case the temperature distribution of the plate is flatter than the one in the non-conjugate case. This feature is more pronounced under turbulent flow when compared with the laminar flow.

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Chernova, A. A. "Validation of RANS Turbulence Models for the Conjugate Heat Exchange Problem". Nelineinaya Dinamika 18, n.º 1 (2022): 61–82. http://dx.doi.org/10.20537/nd220105.

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This paper addresses problems of mathematical modeling of heat exchange processes in the pre-nozzle volume of a solid propellant rocket engine with a charge with starlike cross-section and a recessed hinged nozzle. Methods of mathematical modeling are used to solve the quasi-stationary spatial conjugate problem of heat exchange. An analysis is made of the influence of RANS turbulence models on the flow structure in the flow channels of the engine and on the computed heat flow distributions over the surface of the recessed nozzle. Methods of mathematical modeling are used to solve the quasi-stationary spatial conjugate problem of heat exchange. Results of validation of RANS turbulence models are presented using well-known experimental data. A comparison of numerical and experimental distributions of the heat-transfer coefficient over the inlet surface of the recessed nozzle for the engine with a cylindrical channel charge is made for a primary choice of turbulence models providing a qualitative agreement between calculated and experimental data. By analyzing the results of numerical modeling of the conjugate problem of heat exchange in the combustion chamber of the solid propellant engine with a starlike channel, it is shown that the SST $k-\omega$ turbulence model provides local heat-transfer coefficient distributions that are particularly close to the experimental data.

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Chiu, Wilson K. S., Cristy J. Richards e Yogesh Jaluria. "Experimental and Numerical Study of Conjugate Heat Transfer in a Horizontal Channel Heated From Below". Journal of Heat Transfer 123, n.º 4 (1 de fevereiro de 2001): 688–97. http://dx.doi.org/10.1115/1.1372316.

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Conjugate heat transfer has significant relevance to a number of thermal systems and techniques which demand stringent temperature control, such as electronic cooling and chemical vapor deposition. A detailed experimental and numerical study is carried out to investigate conjugate heat transfer in a common configuration consisting of a horizontal channel with a heated section. Experimental data obtained from this study provides physical insight into conjugate heat transfer effects and facilitates validation of numerical conjugate heat transfer models. The basic characteristics of the flow and the associated thermal transport are studied. The numerical model is used to carry out a parametric study of operating conditions and design variables, thus allowing for the characterization of the conjugate heat transfer effects. It is found that the numerically predicted flow field and heat transfer results validate well to experimental observations. Conjugate heat transfer is shown to significantly affect the temperature level and uniformity at the heated section’s surface, channel walls and the gas phase, thus impacting the rate of heat transfer. This study provides guidelines and fundamental insight into temperature control during the combined modes of heat transfer, with implications to various thermal manufacturing methods.

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Olek, Shmuel. "MULTIREGION CONJUGATE HEAT TRANSFER". Hybrid Methods in Engineering 1, n.º 2 (1999): 19. http://dx.doi.org/10.1615/hybmetheng.v1.i2.30.

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Yang, Jian, Yue Zhang, Mingxin Gao e Hua Song. "Effects of non-isothermal oxidation on transient conjugate heat transfer of the cryo-supersonic air-quenching". Thermal Science, n.º 00 (2021): 147. http://dx.doi.org/10.2298/tsci201111147y.

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In this paper, the effects of non-isothermal oxidation on transient conjugate heat transfer of the cryo-supersonic air-quenching are investigated based on a double-layered oxidation kinetics model, while a unified conjugate heat transfer formula is developed to synthetically consider the near-wall turbulence, non-isothermal oxidation, and surface radiation. The comparison between numerical and experimental results are also presented to check the validity of the developed model. The results indicate that the film growth has some degree of inhibition to the conjugate heat transfer, in particular, the stagnation temperature increases linearly by about 5 K per 100 ?m increase in film thickness, and the effective conjugate heat transfer coefficient in the stagnation region decreases linearly by about 55 Wm-2K-1 per 100 ?m increase in film thickness. Moreover, the oxide film would have little impact on transient conjugate heat transfer when the near-wall velocity is higher due to the effect of viscous dissipation.

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Elmarghany, Mohamed, Mohamed Mansour, Ahmed Sultan e Mohamed Sabry. "Modeling of Conjugate Heat Transfer". Bulletin of the Faculty of Engineering. Mansoura University 41, n.º 1 (30 de junho de 2020): 16–23. http://dx.doi.org/10.21608/bfemu.2020.99354.

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Bohn, Dieter, Jing Ren e Karsten Kusterer. "Systematic Investigation on Conjugate Heat Transfer Rates of Film Cooling Configurations". International Journal of Rotating Machinery 2005, n.º 3 (2005): 211–20. http://dx.doi.org/10.1155/ijrm.2005.211.

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For the determination of the film-cooling heat transfer, the design of a turbine blade relies on the conventional determination of the adiabatic film-cooling effectiveness and heat transfer conditions for test configurations. Thus, additional influences by the interaction of fluid flow and heat transfer and influences by additional convective heat transfer cannot be taken into account with sufficient accuracy. Within this paper, calculations of a film-cooled duct wall and a film-cooled real blade with application of the adiabatic and a conjugate heat transfer condition have been performed for different configurations. It can be shown that the application of the conjugate calculation method comprises the influence of heat transfer within the cooling film. The local heat transfer rate varies significantly depending on the local position.

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Korotkov, Aleksey, Andrey Kozelkov, Andrey Kurkin, Robert Giniyatullin e Sergey Lashkin. "Numerical Simulation of the Conjugate Heat Transfer of a “Fluid–Solid Body” System on an Unmatched Grid Interface". Fluids 8, n.º 10 (27 de setembro de 2023): 266. http://dx.doi.org/10.3390/fluids8100266.

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Recently, when modeling transient problems of conjugate heat transfer, the independent construction of grid models for fluid and solid subdomains is increasingly being used. Such grid models, as a rule, are unmatched and require the development of special grid interfaces that match the heat fluxes at the interface. Currently, the most common sequential approach to modeling problems of conjugate heat transfer requires the iterative matching of boundary conditions, which can significantly slow down the process of the convergence of the solution in the case of modeling transient problems with fast processes. The present study is devoted to the development of a direct method for solving conjugate heat transfer problems on grid models consisting of inconsistent grid fragments on adjacent boundaries in which, in the general case, the number and location of nodes do not coincide. A conservative method for the discretization of the heat transfer equation by the direct method in the region of inconsistent interface boundaries between liquid and solid bodies is proposed. The proposed method for matching heat fluxes at mismatched boundaries is based on the principle of forming matched virtual boundaries, proposed in the GGI (General Grid Interface) method. A description of a numerical scheme is presented, which takes into account the different scales of cells and the sharply different thermophysical properties at the interface between liquid and solid media. An algorithm for constructing a conjugate matrix, the form of matrix coefficients responsible for conjugate heat transfer, and methods for calculating them are described. The operability of the presented method is demonstrated by the example of calculating conjugate heat transfer problems, the grid models of which consist of inconsistent grid fragments. The use of the direct conjugation method makes it possible to effectively solve both stationary and non-stationary problems using inconsistent meshes, without the need to modify them in the conjugation region within a single CFD solver.

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Boyd, Ronald D., e Aaron M. May. "Conjugate Heat Transfer High-Heat-Flux Amplification Simulation". Fusion Science and Technology 57, n.º 2 (fevereiro de 2010): 129–41. http://dx.doi.org/10.13182/fst10-a9367.

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Pujari, Arun Kumar, B. V. S. S. S. Prasad e N. Sitaram. "Conjugate Heat Transfer Study at Interior Surface of NGV Leading Edge with Combined Shower Head and Impingement Cooling". International Journal of Rotating Machinery 2014 (2014): 1–14. http://dx.doi.org/10.1155/2014/754983.

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A computational study on conjugate heat transfer is carried out to present the behavior of nondimensional temperature and heat transfer coefficient of a Nozzle Guide Vane (NGV) leading edge. Reynolds number of both mainstream flow and coolant impinging jets are varied. The NGV has five rows of film cooling holes arranged in shower head manner and four rows of impingement holes arranged in staggered manner. The results are presented by considering materials of different thermal conductivity. The results show that the mainstream flow affects the temperature distribution on the interior side of the vane leading edge for high conductivity material whereas it has negligible effects for low conductivity material. The effect of changing blowing ratio on internal heat transfer coefficient and internal surface temperature is also presented.

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Afify, Ahmed A., e Nasser S. Elgazery. "Impacts of Newtonian heating, variable fluid properties and Cattaneo–Christov model on MHD stagnation point flow of Walters’ B fluid induced by stretching surface". International Journal of Modern Physics C 31, n.º 09 (11 de agosto de 2020): 2050125. http://dx.doi.org/10.1142/s0129183120501259.

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MHD viscoelastic (Walters’-B) fluid flow close to the stagnation point region along an extending plate with the changeable fluid properties’ influences has been debated. Heat transfer’s features are scrutinized via Cattaneo–Christov (CC) theory. The mathematical model for the physical problem is tackled numerically via Chebyshev pseudospectral (CPS) technique. The existing outcomes are supported by recent research and have acquired a suitable agreement. The numerical outcomes reveal that temperature fields are more pronounced for Fourier’s law case. Further, the opposite behavior is noticed with the heat transfer rate. Higher values of the conjugate parameter result in an increment of the heat transfer rate and temperature field. Fluid flow’s features, as well as physical quantities, are substantially varied via variable fluid properties.

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Anderson, Ann M. "Decoupling Convective and Conductive Heat Transfer Using the Adiabatic Heat Transfer Coefficient". Journal of Electronic Packaging 116, n.º 4 (1 de dezembro de 1994): 310–16. http://dx.doi.org/10.1115/1.2905703.

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In many heat transfer situations, such as those found in the electronics cooling field, more than a single mode of heat transfer occurs. For example, modules on a printed circuit board dissipate heat through convection to the air, through conduction to the board and through radiation to the surroundings. The adiabatic heat transfer coefficient, had, works well in such situations because it describes the change in wall temperature due to each incremental change in the convective heat transfer rate (due to conduction, radiation, or generation in the wall). The value of had is independent of the surface heat transfer distribution and can be used with the superposition method to interface between a convection solver and a conduction solver and “decouple” a conjugate heat transfer problem. If one uses the heat transfer coefficient based on the mean fluid temperature, hm, the problem is complicated because the value of hm is a function of the surface heat transfer distribution. This decoupling strategy is demonstrated through a series of numerical computations which solve the fully conjugate problem for laminar flow in a duct. These results are then compared to the decoupled solution. Excellent agreement between the fully conjugate and the decoupled solution is found for all cases when had and Tad are used to decouple the problem. Using hm and Tm can result in temperature prediction errors as large as 50 percent (for the cases studied here). The results show that when the Biot number (formulated as the resistance to axial wall conduction over the resistance to convection) is greater than 1.0 the adiabatic heat transfer coefficient should be used to decouple the problem. If the Biot number is below this value, h based on the mean temperature (for uniform surface temperature) can be used as the decoupler.

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Badruddin, Irfan Anjum, Azeem Khan, Mohd Yamani Idna Idris, N. Nik-Ghaali, Salman Ahmed N.J. e Abdullah A. A. A. Al-Rashed. "Simplified finite element algorithm to solve conjugate heat and mass transfer in porous medium". International Journal of Numerical Methods for Heat & Fluid Flow 27, n.º 11 (6 de novembro de 2017): 2481–507. http://dx.doi.org/10.1108/hff-08-2016-0324.

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Purpose The purpose of this paper is to highlight the advantages of a simplified algorithm to solve the problem of heat and mass transfer in porous medium by reducing the number of partial differential equations from four to three. Design/methodology/approach The approach of the present paper is to develop a simplified algorithm to reduce the number of equations involved in conjugate heat transfer in porous medium. Findings Developed algorithm/method has many advantages over conventional method of solution for conjugate heat transfer in porous medium. Research limitations/implications The current work is applicable to conjugate heat transfer problem. Practical implications The developed algorithm is useful in reducing the number of equations to be solved, thus reducing the computational resources required. Originality/value Development of simplified algorithm and comparison with conventional method.

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Lien, Fue-Sang, e Cha’o-Kuang Chen. "Effects of Microstructure on the Conjugated Mixed Forced and Free Convection-Conduction Analysis of Heat Transfer in a Vertical Plate Fin". Journal of Heat Transfer 108, n.º 3 (1 de agosto de 1986): 580–84. http://dx.doi.org/10.1115/1.3246974.

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A conjugated convection-conduction analysis has been made for a vertical plate fin which exchanges heat with its micropolar fluid environment by mixed forced and free convection. The analysis is based on a one-dimensional model for the plate fin whereby the heat conduction equation for the fin is solved simultaneously with the conservation equations for mass, momentum, angular momentum, and energy in the micropolar fluid boundary layer adjacent to the fin. The local heat transfer coefficient is not specified in advance but is one of the results of the numerical solutions. Numerical results of the overall heat transfer rate, the local heat transfer coefficient, the local heat flux, and the fin temperature distribution for Pr = 5 are presented for various values of Δ (dimensionless material parameter), Nc (conjugated convection-conduction parameter), and Ω (buoyancy parameter).

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Kuznetsov, Geniy, e Alexander Nee. "Modelling of the conjugate natural convection in a closed system with the radiant heating source radiant energy distribution by Lambert’s cosine law". Thermal Science 22, n.º 1 Part B (2018): 591–601. http://dx.doi.org/10.2298/tsci160120256k.

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Various types of emitters are often used as energy sources in real engineering systems and technological processes. Investigations of heat transfer basic laws in such systems are of interest. We conducted mathematical modelling of conjugate heat transfer in a closed rectangular cavity under conditions of radiant energy source operating. The 2-D problem of conjugate natural convection in vorticity stream function-temperature dimensionless variables has been numerically solved by means of the finite difference method. Radiant energy distribution along the gas-wall interfaces was set by Lamberts? cosine law. We obtained fields of temperature and stream functions in a wide range of governing parameters (Rayleigh number 104 ? Ra ? 106, the length of radiant heating source 0.15 ? D ? 0.6). Then we analyzed how heat retaining properties of finite thickness heat conducting walls made of different materials affect the heat transfer intensity. Differential characteristics distribution showed significant non-uniformity and non-stationarity of the conjugate heat transfer process under study.

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El‐Shaarawi, M. A. I., M. A. Al‐Nimr e M. A. Hader. "Transient conjugated heat transfer in concentric annuli". International Journal of Numerical Methods for Heat & Fluid Flow 5, n.º 5 (maio de 1995): 459–73. http://dx.doi.org/10.1108/eum0000000004073.

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Pozzi, Amilcare, e Renato Tognaccini. "Conjugated heat transfer in unsteady channel flows". International Journal of Heat and Mass Transfer 54, n.º 17-18 (agosto de 2011): 4019–27. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2011.04.019.

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Dorfman, Abram, e Zachary Renner. "Conjugate Problems in Convective Heat Transfer: Review". Mathematical Problems in Engineering 2009 (2009): 1–27. http://dx.doi.org/10.1155/2009/927350.

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A review of conjugate convective heat transfer problems solved during the early and current time of development of this modern approach is presented. The discussion is based on analytical solutions of selected typical relatively simple conjugate problems including steady-state and transient processes, thermal material treatment, and heat and mass transfer in drying. This brief survey is accompanied by the list of almost two hundred publications considering application of different more and less complex analytical and numerical conjugate models for simulating technology processes and industrial devices from aerospace systems to food production. The references are combined in the groups of works studying similar problems so that each of the groups corresponds to one of selected analytical solutions considered in detail. Such structure of review gives the reader the understanding of early and current situation in conjugate convective heat transfer modeling and makes possible to use the information presented as an introduction to this area on the one hand, and to find more complicated publications of interest on the other hand.

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Ahn, Joon, Jeong Chul Song e Joon Sik Lee. "Fully Coupled Large Eddy Simulation of Conjugate Heat Transfer in a Ribbed Channel with a 0.1 Blockage Ratio". Energies 14, n.º 8 (9 de abril de 2021): 2096. http://dx.doi.org/10.3390/en14082096.

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Large eddy simulations are performed to analyze the conjugate heat transfer of turbulent flow in a ribbed channel with a heat-conducting solid wall. An immersed boundary method (IBM) is used to determine the effect of heat transfer in the solid region on that in the fluid region in a unitary computational domain. To satisfy the continuity of the heat flux at the solid–fluid interface, effective conductivity is introduced. By applying the IBM, it is possible to fully couple the convection on the fluid side and the conduction inside the solid and use a dynamic subgrid scale model in a Cartesian grid. The blockage ratio (e/H) is set at 0.1, which is typical for gas turbine blades. Through conjugate heat transfer analysis, it is confirmed that the heat transfer peak in front of the rib occurs because of the impinging of the reattached flow and not the influence of the thermal boundary condition. When the rib turbulator acts as a fin, its efficiency and effectiveness are predicted to be 98.9% and 8.32, respectively. When considering conjugate heat transfer, the total heat transfer rate is reduced by 3% compared with that of the isothermal wall. The typical Biot number at the internal cooling passage of a gas turbine is <0.1, and the use of the rib height as the characteristic length better represents the heat transfer of the rib.

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Salman, Ahmed N. J., Sarfaraz Kamangar, Irfan Anjum Badruddin, Abdullah A. A. A. Al-Rashed, G. A. Quadir, H. M. T. Khaleed e T. M. Yunus Khan. "CONJUGATE HEAT TRANSFER IN POROUS ANNULUS". Journal of Porous Media 17, n.º 12 (2014): 1109–19. http://dx.doi.org/10.1615/jpormedia.v17.i12.70.

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Zhao, Fu-Yun, Di Liu e Guang-Fa Tang. "Conjugate heat transfer in square enclosures". Heat and Mass Transfer 43, n.º 9 (1 de agosto de 2006): 907–22. http://dx.doi.org/10.1007/s00231-006-0136-4.

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M.Rathinam, Thansekhar. "Effect of Al2O3/water nanofluid on Conjugate Free Convection in a Baffle Attached Square Enclosure". Mechanics 26, n.º 2 (20 de abril de 2020): 126–33. http://dx.doi.org/10.5755/j01.mech.26.2.22378.

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A numerical study of conjugate free convection heat transfer of Al2O3/water nanofluid inside a differentially heated square enclosure with a baffle attached to its hot wall has been carried out. A detailed parametric study has been carried out to analyze the effect of Rayleigh number (104 < Ra < 106), length, thickness and position of baffle, conductivity ratio and volume fraction of the nanoparticle (0<<0.2) on heat transfer. The thermal conductivity ratio of the baffle plays a major role on the conjugate heat transfer inside the enclosure. Higher the baffle length better is the effectiveness of the baffle. The average Nusselt number is found to be an increasing function of both thermal conductivity ratio and volume fraction of the nanofluid. The minimum enhancement of conjugate heat transfer is 30% when Al2O3/water nanofluid of 0.1 volume fraction is used for the entire range of Rayleigh number considered.

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Chiba, Ryoichi. "CONJUGATED HEAT TRANSFER IN COCURRENT FLOW MULTI-STREAM HEAT EXCHANGERS". Chemical Engineering Communications 197, n.º 8 (abril de 2010): 1076–90. http://dx.doi.org/10.1080/00986440903412969.

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Canli, Eyub, Ali Ates e Sefik Bilir. "Conjugate heat transfer for turbulent flow in a thick walled plain pipe". EPJ Web of Conferences 180 (2018): 02014. http://dx.doi.org/10.1051/epjconf/201818002014.

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Laminar and turbulent flow have their own characteristics in respect of heat transfer in pipes. While conjugate heat transfer is a major concern for a thick walled pipe with laminar flow inside it, there are limited studies about a turbulent flow in a thick walled plain pipe considering the conjugate heat transfer. In order to conduct such a work by means of in-house developed code, it was desired to make a preliminary investigation with commercially available CFD codes. ANSYS CFD was selected as the tool since it has a positive reputation in the literature for reliability. Defined heat transfer problem was solved with SIMPLE and Coupled Schemes for pressure velocity coupling and results are presented accordingly.

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Faghri, A., S. Thomas e M. M. Rahman. "Conjugate Heat Transfer From a Heated Disk to a Thin Liquid Film Formed by a Controlled Impinging Jet". Journal of Heat Transfer 115, n.º 1 (1 de fevereiro de 1993): 116–23. http://dx.doi.org/10.1115/1.2910636.

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An experimental and numerical study of the heat transfer from a heated horizontal disk to a thin film of liquid is described. The liquid was delivered to the disk by a collar arrangement such that the film thickness and radial velocity were known at the outer radius of the collar. This method of delivery is termed as a controlled impinging jet. Flow visualization tests were performed and heat transfer data were collected along the radius of the disk for different volumetric flow rates and inlet temperatures in the supercritical and subcritical regions. The heat transfer coefficient was found to increase with flow rate when both supercritical and subcritical regions were present on the heated surface. A numerical simulation of this free surface problem was performed, which included the effects of conjugate heat transfer within the heated disk and the liquid. The numerical predictions agree with the experimental results and show that conjugate heat transfer has a significant effect on the local wall temperature and heat transfer coefficient.

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Saidoune, F., M. N. Bouaziz e A. Aziz. "Conjugate Heat and Mass Transfer on Steady MHD Mixed Convection Flow along a Vertical Slender Hollow Cylinder with Heat Generation and Chemical Reaction Effects". Defect and Diffusion Forum 406 (janeiro de 2021): 53–65. http://dx.doi.org/10.4028/www.scientific.net/ddf.406.53.

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This paper studies the effects of heat generation and chemical reaction on the coupled conjugate heat and mass transfer by MHD laminar mixed convective flow along a vertical slender hollow cylinder. The governing boundary layer equations along with the boundary conditions are first cast into a dimensionless form by a non similar transformation and the resulting equations are then solved by the finite difference method using Matlab@ following the code bvp4c. Numerical results of the velocity, temperature and concentration for different values of the conjugate heat transfer parameter p, the magnetic parameter M, the heat generation Q, and the chemical reaction K are studied. The local skin friction, Nusselt number and Sherwood number are also analyzed and presented graphically. In the numerical ranges of the main parameters, it is found mainly that working with strong conjugate heat transfer or/and all others parameters affects negatively the Nusselt and Sherwood numbers. The same trend is revealed for the skin friction factor.

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Saidoune, F., M. N. Bouaziz e A. Aziz. "Conjugate Heat and Mass Transfer on Steady MHD Mixed Convection Flow along a Vertical Slender Hollow Cylinder with Heat Generation and Chemical Reaction Effects". Defect and Diffusion Forum 406 (janeiro de 2021): 53–65. http://dx.doi.org/10.4028/www.scientific.net/ddf.406.53.

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This paper studies the effects of heat generation and chemical reaction on the coupled conjugate heat and mass transfer by MHD laminar mixed convective flow along a vertical slender hollow cylinder. The governing boundary layer equations along with the boundary conditions are first cast into a dimensionless form by a non similar transformation and the resulting equations are then solved by the finite difference method using Matlab@ following the code bvp4c. Numerical results of the velocity, temperature and concentration for different values of the conjugate heat transfer parameter p, the magnetic parameter M, the heat generation Q, and the chemical reaction K are studied. The local skin friction, Nusselt number and Sherwood number are also analyzed and presented graphically. In the numerical ranges of the main parameters, it is found mainly that working with strong conjugate heat transfer or/and all others parameters affects negatively the Nusselt and Sherwood numbers. The same trend is revealed for the skin friction factor.

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Kato, Yuki, Kenmei Fujimoto, Guanming Guo, Mikimasa Kawaguchi, Masaya Kamigaki, Masanobu Koutoku, Hitoshi Hongou, Haruna Yanagida e Yoichi Ogata. "Heat Transfer Characteristics of Turbulent Flow in Double-90°-Bend Pipes". Energies 16, n.º 21 (28 de outubro de 2023): 7314. http://dx.doi.org/10.3390/en16217314.

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This study evaluates the heat dissipation and Nusselt number for an S-shaped double-bend pipe, for which an experimental evaluation is lacking. In terms of the velocity field, the mean velocity and turbulent kinetic energy were measured through particle image velocimetry. Heat transfer characteristics were evaluated in validated conjugate heat transfer simulations, and a k-ω SST turbulence model was used for flow simulation inside the pipe. Heat transfer enhancement was observed at the first bend, as observed in previous studies on single-bend and U-shaped bends, whereas no heat transfer enhancement was observed at the second bend. This result was due to higher turbulent heat flux at the first bend because of higher eddy diffusion on the outside of the bend, whereas eddy diffusion was lower on the outside of the second bend owing to the history of the first bend. The heat transfer characteristics of the S-shaped double-bend pipe elucidated in this study provide valuable insight for devising strategies to reduce heat loss in automotive exhaust pipes with multiple bends. Furthermore, the conjugate heat transfer simulation model used in this study provides a benchmark for heat transfer calculations for multi-bend pipes.

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Kiran K. Ambatipudi, Muhammad M. Ra. "ANALYSIS OF CONJUGATE HEAT TRANSFER IN MICROCHANNEL HEAT SINKS". Numerical Heat Transfer, Part A: Applications 37, n.º 7 (12 de junho de 2000): 711–31. http://dx.doi.org/10.1080/104077800274046.

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Luo, Jiang, e Eli H. Razinsky. "Conjugate Heat Transfer Analysis of a Cooled Turbine Vane Using the V2F Turbulence Model". Journal of Turbomachinery 129, n.º 4 (24 de julho de 2006): 773–81. http://dx.doi.org/10.1115/1.2720483.

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The conjugate heat transfer methodology has been employed to predict the flow and thermal properties including the metal temperature of a NASA turbine vane at three operating conditions. The turbine vane was cooled internally by air flowing through ten round pipes. The conjugate heat transfer methodology allows a simultaneous solution of aerodynamics and heat transfer in the external hot gas and the internal cooling passages and conduction within the solid metal, eliminating the need for multiple/decoupled solutions in a typical industry design process. The model of about 3 million computational meshes includes the gas path and the internal cooling channels, comprising hexa cells, and the solid metal comprising hexa and prism cells. The predicted aerodynamic loadings were found to be in close agreement with the data for all the cases. The predicted metal temperature, external, and internal heat transfer distributions at the midspan compared well with the measurement. The differences in the heat transfer rates and metal temperature under different running conditions were also captured well. The V2F turbulence model has been compared with a low-Reynolds-number k-ε model and a nonlinear quadratic k-ε model. The V2F model is found to provide the closest agreement with the data, though it still has room for improvement in predicting the boundary layer transition and turbulent heat transfer, especially on the suction side. The overall results are quite encouraging and indicate that conjugate heat transfer simulation with proper turbulence closure has the potential to become a viable tool in turbine heat transfer analysis and cooling design.

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Gorshenin, A. S., J. I. Rakhimova e N. P. Krasnova. "Conjugated Heat Exchange in Heat Treatment of Aluminum Ingots Simulation". Journal of Physics: Conference Series 2096, n.º 1 (1 de novembro de 2021): 012053. http://dx.doi.org/10.1088/1742-6596/2096/1/012053.

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Abstract Casting aluminum to obtain semi-finished products - round ingots, due to uneven cooling in the mold, leads to various defects that affect further machining. To eliminate such defects, heat treatment is carried out - homogenization annealing. One of the homogenization important stages is the cooling of the ingots after heating at a rate that does not lead to the ingot quenching. The cooling medium is air. Knowing the conditions of heat exchange between the cooling air and the high-temperature aluminum billet makes it possible to obtain the ingot’s necessary physical and mechanical properties. The article describes the developed mathematical model of conjugate heat transfer during homogenization annealing of aluminum ingot. It allows analytically calculating the temperature of the ingots depending on the cooling time. To verify the data obtained by the mathematical model, the conjugate heat transfer in the ANSYS program was simulated.

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Li, Yongxiang, Florian Ries, Kaushal Nishad e Amsini Sadiki. "Predictions of Conjugate Heat Transfer in Turbulent Channel Flow Using Advanced Wall-Modeled Large Eddy Simulation Techniques". Entropy 23, n.º 6 (7 de junho de 2021): 725. http://dx.doi.org/10.3390/e23060725.

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In this paper, advanced wall-modeled large eddy simulation (LES) techniques are used to predict conjugate heat transfer processes in turbulent channel flow. Thereby, the thermal energy transfer process involves an interaction of conduction within a solid body and convection from the solid surface by fluid motion. The approaches comprise a two-layer RANS–LES approach (zonal LES), a hybrid RANS–LES representative, the so-called improved delayed detached eddy simulation method (IDDES) and a non-equilibrium wall function model (WFLES), respectively. The results obtained are evaluated in comparison with direct numerical simulation (DNS) data and wall-resolved LES including thermal cases of large Reynolds numbers where DNS data are not available in the literature. It turns out that zonal LES, IDDES and WFLES are able to predict heat and fluid flow statistics along with wall shear stresses and Nusselt numbers accurately and that are physically consistent. Furthermore, it is found that IDDES, WFLES and zonal LES exhibit significantly lower computational costs than wall-resolved LES. Since IDDES and especially zonal LES require considerable extra work to generate numerical grids, this study indicates in particular that WFLES offers a promising near-wall modeling strategy for LES of conjugated heat transfer problems. Finally, an entropy generation analysis using the various models showed that the viscous entropy production is zero inside the solid region, peaks at the solid–fluid interface and decreases rapidly with increasing wall distance within the fluid region. Except inside the solid region, where steep temperature gradients lead to high (thermal) entropy generation rates, a similar behavior is monitored for the entropy generation by heat transfer process.

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Chiu, W. K. S., e Y. Jaluria. "Effect of Buoyancy, Susceptor Motion, and Conjugate Transport in Chemical Vapor Deposition Systems". Journal of Heat Transfer 121, n.º 3 (1 de agosto de 1999): 757–61. http://dx.doi.org/10.1115/1.2826049.

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The fluid flow and heat transfer in the chemical vapor deposition (CVD) manufacturing process are studied numerically. Several crucial aspects such as thermal buoyancy, continuous processing, and conjugate transport are considered. For each aspect, the predicted heat transfer rate and the susceptor temperature are computed and qualitatively linked with the rate and uniformity of film deposition. It is shown that buoyancy effects in helium carrier gas commonly used in diffusion-limited CVD has a negligible effect on deposition rates. Susceptor motion is shown as a feasible alternative to improving the productivity. Conjugate heat transfer effects that arise demonstrate that reactor wall thickness and material may be judiciously chosen to improve temperature uniformity and enhance heat transfer rates, thereby improving deposition rate, film uniformity, and quality.

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Leppänen, Anton, Asko Kumpula, Joona Vaara, Massimo Cattarinussi, Juho Könnö e Tero Frondelius. "Thermomechanical Fatigue Analysis of Cylinder Head". Rakenteiden Mekaniikka 50, n.º 3 (21 de agosto de 2017): 182–85. http://dx.doi.org/10.23998/rm.64743.

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The finite element simulation of a cylinder head has been carried out with Abaqus Standard using Z-mat material model, with thermal boundary conditions coming from combined conjugate heat transfer and gas-exchange simulations. The fatigue post-processing of results has been done with Z-post software using ONERA fatigue model. The resulting lifetime values have been found out to correspond well to observations from the field.

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Poubeau, Adèle, Arthur Vauvy, Florence Duffour, Jean-Marc Zaccardi, Gaetano de Paola e Marek Abramczuk. "Modeling investigation of thermal insulation approaches for low heat rejection Diesel engines using a conjugate heat transfer model". International Journal of Engine Research 20, n.º 1 (16 de dezembro de 2018): 92–104. http://dx.doi.org/10.1177/1468087418818264.

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Heat losses through combustion chamber walls are a well-known limiting factor for the overall efficiency of internal combustion engines. Thermal insulation of the walls has the potential to decrease substantially these heat losses. However, evaluating numerically the effect of coating and of its location in the combustion chamber and then design an optimized combustion system require the use of high-fidelity engine models. The objective of this article is to present the whole workflow implying the use of three-dimensional computational fluid dynamics techniques with conjugate heat transfer (CHT) models to investigate the potential benefits of a coating on a passenger car Diesel engine. First, the baseline combustion system is modeled, using CHT models to solve in a coupled simulation the heat transfers between the fluid in the intake and exhaust lines and in the combustion chamber, on one hand, and the solid piston, head and valves, on the other hand. Based on this setup, a second simulation is performed, modeling a thermo-swing insulation on all combustion chamber walls by a contact resistance, neglecting its thermal inertia to keep a manageable computational cost. Results show a decrease of 3.3% in fuel consumption with an increase in volumetric efficiency. However, decoupled one-dimensional/three-dimensional simulations highlight the inaccuracy of these results and the necessity to model the coating thermal inertia, as they show an overestimation of the heat insulation rate and, consequently, of the gain in fuel consumption (−2.1% instead of −1.6%), for a coating on the piston with no thermal inertia.

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Rahman, M. M., Hakan Oztop, S. Mekhilef, R. Saidur, A. Chamkha, A. Ahsan e Khaled S. Al-Salem. "A finite element analysis on combined convection and conduction in a channel with a thick walled cavity". International Journal of Numerical Methods for Heat & Fluid Flow 24, n.º 8 (28 de outubro de 2014): 1888–905. http://dx.doi.org/10.1108/hff-07-2013-0239.

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Purpose – The purpose of this paper is to examine the effects of thick wall parameters of a cavity on combined convection in a channel. In other words, conjugate heat transfer is solved. Design/methodology/approach – Galerkin weighted residual finite element method is used to solve the governing equations of mixed convection. Findings – The streamlines, isotherms, local and average Nusselt numbers are obtained and presented for different parameters. It is found heat transfer is an increasing function of dimensionless thermal conductivity ratio. Originality/value – The literature does not have mixed convection and conjugate heat transfer problem in a channel with thick walled cavity.

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Jeon, Byoung Jin, e Hyoung Gwon Choi. "Heat-transfer analysis of indirect moxibustion using unsteady conjugate heat-transfer solutions". Journal of Mechanical Science and Technology 24, n.º 10 (outubro de 2010): 2051–57. http://dx.doi.org/10.1007/s12206-010-0620-0.

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Cui, Hao, Lang Wang, Xueying Li e Jing Ren. "Data-Driven Conjugate Heat Transfer Analysis of a Gas Turbine Vane". Processes 10, n.º 11 (9 de novembro de 2022): 2335. http://dx.doi.org/10.3390/pr10112335.

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Cooling structures of gas turbine blades have become more complex to achieve a better cooling effect. Therefore, heat transfer analysis tools with higher accuracy and efficiency are required to verify the effectiveness of cooling designs and continuously improve the design. In this work, a data-driven method is combined with a decoupled conjugate heat transfer analysis. The analysis object is a typical air-cooled gas turbine first-stage vane with film cooling, impingement cooling, and pin-fin cooling. In addition, a conventional 3-D conjugate heat transfer simulation of the vane was executed for contrast. Results show that this method shortens the time of the heat transfer analysis process significantly and ensures accuracy. It proves that the data-driven method is effective for the evaluation of a modern gas turbine cooling design and is an improvement compared to the traditional three-dimensional heat transfer analysis method.

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Kassemi, M., e B. T. F. Chung. "Combined conjugated heat transfer from a scattering medium". Journal of Thermophysics and Heat Transfer 6, n.º 3 (julho de 1992): 548–51. http://dx.doi.org/10.2514/3.397.

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Yan, W. M., Y. L. Tsay e T. F. Lin. "Transient conjugated heat transfer in laminar pipe flows". International Journal of Heat and Mass Transfer 32, n.º 4 (abril de 1989): 775–77. http://dx.doi.org/10.1016/0017-9310(89)90225-1.

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Olek, S., E. Elias, E. Wacholder e S. Kaizerman. "Unsteady conjugated heat transfer in laminar pipe flow". International Journal of Heat and Mass Transfer 34, n.º 6 (junho de 1991): 1443–50. http://dx.doi.org/10.1016/0017-9310(91)90287-o.

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Paik, Seungho, Hoa D. Nguyen e Jacob N. Chung. "Transient conjugated heat transfer analysis from a sphere". Wärme- und Stoffübertragung 29, n.º 7 (julho de 1994): 431–39. http://dx.doi.org/10.1007/bf01584045.

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MacGrath, D., G. Yang e M. A. Ebadian. "Conjugated heat transfer in a concentric annular pipe". Nuclear Engineering and Design 132, n.º 3 (janeiro de 1992): 393–402. http://dx.doi.org/10.1016/0029-5493(92)90233-l.

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Zhang, Haifeng, Dinggen Li, Peixin Ye e Zihao Yu. "Lattice Boltzmann simulation of conjugate forced convection in a channel heat sink with surface-mounted blocks". Canadian Journal of Physics 97, n.º 12 (dezembro de 2019): 1332–41. http://dx.doi.org/10.1139/cjp-2018-0862.

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The study of the conjugate forced convection in a channel has many practical applications and has attracted attention from researchers, although the conjugate heat transfer in this configuration is usually ignored. In this paper, the conjugate forced convection heat transfer in a channel heat sink with surface-mounted blocks is numerically studied with the lattice Boltzmann method. The effects of Reynolds numbers and geometrical parameters of the blocks in different aspect ratios on the flow field and temperature distribution for various thermal conductivity ratio of solid wall to the fluid are analyzed. The results reveal that the distributions of the vortices and streamlines in the channel heat sink largely depend on the geometric parameters, and the increase of the distance between two mounted blocks tends to cause the pressure drop to increase and the average Nusselt number decreases. In addition, we found that a modification of the thermal conductivity ratio of solid to fluid has little effect on the pressure drop, whereas the heat transfer performance becomes much better.

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Välikangas, Turo, e Reijo Karvinen. "Conjugated Heat Transfer Simulation of a Fin-and-Tube Heat Exchanger". Heat Transfer Engineering 39, n.º 13-14 (13 de setembro de 2017): 1192–200. http://dx.doi.org/10.1080/01457632.2017.1363628.

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Hajmohammadi, Mohammad Reza, Seyed Salman Nourazar e Ali Habibi Manesh. "Semi-analytical treatments of conjugate heat transfer". Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 227, n.º 3 (5 de outubro de 2012): 492–503. http://dx.doi.org/10.1177/0954406212463514.

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A new algorithm is proposed based on semi-analytical methods to solve the conjugate heat transfer problems. In this respect, a problem of conjugate forced-convective flow over a heat-conducting plate is modeled and the integro-differential equation occurring in the problem is solved by two lately-proposed approaches, Adomian decomposition method and differential transform method. The solution of the governing integro-differential equation for temperature distribution of the plate is handled more easily and accurately by implementing Adomian decomposition method/differential transform method rather than other traditional methods such as perturbation method. A numerical approach is also performed via finite volume method to examine the validity of the results for temperature distribution of the plate obtained by Adomian decomposition method/differential transform method. It is shown that the expressions for the temperature distribution in the plate obtained from the two methods, Adomian decomposition method and differential transform method, are the same and show closer agreement to the results calculated from numerical work in comparison with the expression obtained by perturbation method existed in the literature.

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Mangani, Luca, Marwan Darwish, Lucian Hanimann, Ali Al Abed, Ernesto Casartelli e Fadl Moukalled. "A fully implicit conjugate heat transfer method". Numerical Heat Transfer, Part B: Fundamentals 78, n.º 3 (6 de maio de 2020): 175–96. http://dx.doi.org/10.1080/10407790.2020.1754101.

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Sahoo, Niranjan, Vinayak Kulkarni e Ravi Kumar Peetala. "Conjugate Heat Transfer Study in Hypersonic Flows". Journal of The Institution of Engineers (India): Series C 99, n.º 2 (12 de maio de 2017): 151–58. http://dx.doi.org/10.1007/s40032-017-0353-2.

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Siddiqui, Muhammad Owais Raza, e Danmei Sun. "Conjugate heat transfer analysis of knitted fabric". Journal of Thermal Analysis and Calorimetry 129, n.º 1 (18 de fevereiro de 2017): 209–19. http://dx.doi.org/10.1007/s10973-017-6166-y.

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