Experimental investigation of the convective heat transfer coefficient for open-cell porous metal fins at low Reynolds numbers

Park, Sungho; Kim, Tae Hyeon; Jeong, Ji Hwan

doi:10.1016/j.ijheatmasstransfer.2016.04.114

Cited by 32 publications

(9 citation statements)

References 26 publications

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“…Over the last two decades, high-porosity metal foams have been evaluated as a potential heat-exchange medium with high surface area density, low weight, and tortuous coolant flow paths that promote flow mixing and prevent the growth of resistive thermal boundary layers. These metal foams have been investigated extensively in the literature, and simplified models [1][2][3][4][5][6][7] and experimental correlations [7][8][9][10][11][12][13][14][15][16] for the friction factor and Nusselt number have been developed to predict the pressure drop and heat transfer performance in forced-convection, foam-filled heat exchangers as a function of their geometric parameters. A recent review article by Zhao [17] presents an overview of thermal-hydraulic transport in high-porosity cellular ceramic and metallic foam materials.…”

Section: Introductionmentioning

confidence: 99%

Design of multifunctional lattice-frame materials for compact heat exchangers

Son

Weibel

Kumaresan

et al. 2017

International Journal of Heat and Mass Transfer

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Structured porous materials show great potential as extended surfaces in heat-exchange applications that also require design for load-bearing capability. In particular, lattice-frame materials (LFM) are known for their superior strength-to-weight ratio; this work presents a comprehensive experimental and numerical study of fluid flow and heat transfer in porous LFMs. Flow through a periodic unit cell of the material is simulated to characterize the forced-convection performance under hydraulically and thermally fully developed conditions. The performance of LFMs with a tetrahedral ligament configuration is characterized as a function of Reynolds number in the laminar regime (150 < Re < 1000) in terms of Nusselt number and friction factor; the effect of porosity is studied by changing the ligament diameter. Experiments are performed for a subset of porosities to validate the numerical approach. A method is demonstrated for utilizing the simulation results, which assume perfect surface efficiency, to predict the performance of LFMs with non-ideal surface efficiency, based on the conduction resistance of the ligaments. It is shown that the thermal behavior of the ligaments closely matches that of cylindrical fins in cross flow and that this analogy can be used to calculate the overall surface efficiency. The implications of the current results on the design of compact heat exchangers using LFMs is assessed using several conventional performance metrics. Our analysis illustrates the challenges in defining any one universal performance metric for compact heat exchanger design; an appropriate performance metric must be selected that accounts for the particular multifunctional performance characteristics of interest. LFMs are shown to provide the benefits of high-porosity and high surface area-to-volume ratio of materials such as metal foams, while also incurring lower pressure drops and displaying higher structural integrity. This makes them ideal for heat exchangers in aerospace and other applications demanding such multifunctional capabilities. The characterization provided in this study readily allows LFM designs for heat exchanger applications with combined heat-transfer and pressure-drop constraints.

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Section: Introductionmentioning

confidence: 99%

Design of multifunctional lattice-frame materials for compact heat exchangers

Son

Weibel

Kumaresan

et al. 2017

International Journal of Heat and Mass Transfer

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“…At low Reynolds numbers, the study of the convective heat transfer coefficient for open‐cell porous metal fins was experimentally performed by Park et al 43 The fabrication of porous metal fins was completed from nickel with various pore densities as well as porosities. An optical method was used to measure the geometrical parameters of the test samples.…”

Section: Experimental Studiesmentioning

confidence: 99%

Improvement of heat transfer through fins: A brief review of recent developments

Maji¹,

Choubey

2020

Heat Trans

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Fins or extended surfaces are generally used in heat exchangers to enhance heat transfer between the main surface and ambient fluid. Various types of simple-shaped fins, namely, rectangular, square, annular, cylindrical, and tapered, have been used with different geometrical combinations. To satisfy industrial demand, different trials have also been carried out for designing optimized fins. The optimization of fins can be performed either by enhancing heat dissipation at an exact fin weight or by diminishing the weight of the fin by precise heat dissipation. Recently a notable amount of work on some typical fins, like, porous fins and perforated fins, has also been carried out. This paper presents a brief review on heat transfer enhancement using fins of different types considering variable thermophysical and geometric parameters, which will also be useful for future use of geometrical modifications of extended surfaces, based on the cost and availability of space.analytical approach, computational approach, experimental approach, perforated fin, porous fin | INTRODUCTIONAdvanced technologies need high-performance heat transfer equipment. Techniques for enhancing the heat transfer rate are classified into two categories: active and passive methods. In the design point of view, active methods are complex as they require some extraneous power input for necessary flow adjustments and to improve the heat transfer rate and thus applications are limited. On the other hand, passive methods require geometrical or surface adjustments to the flow passage by incorporating additional devices. Additionally, by interrupting or varying the existing flow behavior (except for extended surfaces); higher heat transfer coefficients are promoted through this method, which is also followed by an increase in the corresponding pressure drop. The amount of conduction, convection, and radiation of an object shows the amount of heat it transfers. The heat transfer rate is enhanced by increasing the temperature difference between the object and the environment or by enhancing the coefficient of convective heat transfer or by maximizing the surface area of the body. In some cases, it is not appropriate or cost effective to alter the first two options. Introducing a fin to a body, however, expands the surface area and sometimes this is a cost-effective solution for heat transfer problems. Extended surfaces or fins are illustrations of passive methods that are generally used in different industrial applications for the enhancement of heat transfer between the primary surface (heat sink) and the surrounding fluid. Currently reducing the cost and size of fins is the key target of the fin industry. This demand is generally met by the high-thermal-conductivity and costly metals used to fabricate finned surfaces. Many efforts have been made to construct optimized fins. (a) By changing the size and shape of the solid fin: Instead of a longitudinal rectangular solid fin, if the geometry of fin design is changed, the performance parameters and heat tr...

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“…Wang et al [14] experimentally investigated the heat transfer of air in a steel foam tube. Park et al [15] experimentally investigated the convective heat transfer of water in open-cell porous metal fins.…”

Section: S498mentioning

confidence: 99%

Experimental study on heat transfer and flow characteristics of two kinds of porous metal foam tubes filled with water

Wang

Pan

et al. 2018

THERM SCI

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The heat transfer and flow characteristics of water in a copper foam tube, a nickel foam tube, and a smooth tube are investigated in this paper. The copper foam tube and nickel foam tube are produced, and an experiment for testing the heat transfer and flow characteristics of water in metal foam tubes is set up. Experimental system validation is done in this paper, and it is found that the experimental results have a good agreement with that of published literature. The effects of two kinds of metal foam tubes and different Reynolds numbers on the heat transfer and flow characteristics of water are investigated. It is found that copper foam tube shows the best heat transfer performance, followed by the nickel foam tube, and the smooth tube has the worst heat transfer performance. It is also found that comprehensive index of heat transfer and flow increases with Reynolds number.

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Experimental investigation of the convective heat transfer coefficient for open-cell porous metal fins at low Reynolds numbers

Cited by 32 publications

References 26 publications

Design of multifunctional lattice-frame materials for compact heat exchangers

Design of multifunctional lattice-frame materials for compact heat exchangers

Improvement of heat transfer through fins: A brief review of recent developments

Experimental study on heat transfer and flow characteristics of two kinds of porous metal foam tubes filled with water

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