Abstract
A numerical simulation is performed for heat transfer enhancement in a parallel-plate heat exchanger equipped with multiple metal foam blocks of various size. Localized heat sources are placed on the top wall of the exchanger in the location of the metallic foam blocks. The Brinkman-Forchheimer-extended Darcy model is used to characterize the flow field inside the foam region. Solution of the coupled governing equations for the composite fluid/ foam system is obtained using the finite volume method. In this study, the influence of the parameters such as the Darcy number, the Reynolds number and the arrangement of the foam samples on the hydrodynamic and thermal behavior of the flow are deeply analyzed. The results are reported for two different configurations containing four metal foam blocks mounted alternately on the top and bottom of the channel walls: (1) blocks are attached straightly to the channel walls and (2) blocks positioned at a precise distance from the channel walls . The obtained results show that the improvement of the cooling of the heat sources by forced convection is better in configuration (2).
Highlights
The improvement of heat exchange with a reduction of the pressure drop in the design of the heat exchangers is a major challenge
Mancin et al [2] conducted an experimental study of heat transfer and fluid flow in a horizontal channel fitted with seven aluminum open-cell foam samples of different grades, porosity and height for different air mass velocities and heat fluxes
Journal of Thermal Engineering, Research Article, Vol 7, No 1, pp. 255-270, January, 2021 the channel augmented the heat transfer compared to the pressure drop.Wang et al [9] used ForcheimerBrinkman equation along with the thermal equilibrium model to investigate the effect of inserting metal foams in a receiver tube installed in solar collector
Summary
The improvement of heat exchange with a reduction of the pressure drop in the design of the heat exchangers is a major challenge. Jeng et al [1] demonstrated experimentally the heat transfer enhancement in a duct fitted with discrete aluminum foam blocks using different configurations They used samples with uniform porosity of 0.9 and a grade of 10 PPI. Mancin et al [2] conducted an experimental study of heat transfer and fluid flow in a horizontal channel fitted with seven aluminum open-cell foam samples of different grades, porosity and height for different air mass velocities and heat fluxes. Chen et al [10] numerical reported forced convection in a horizontal channel using four metal-foam blocks as heat sinks Both DarcyBrinkman-Forchheimer flow model and the two-temperature-equation model which assumes local thermal nonequilibrium (LTNE) between the fluid and the solid phases were used to characterise the thermo-flow fields inside the porous region.Yang and Hwang [11] performed numerical predictions on the heat transfer characteristics of a turbulent fluid flow in a rectangular channel fitted with porous baffles which were arranged alternately on the bottom and top channel walls. Particular emphasis will be placed on the effects of various parameters governing the thermo-hydrodynamic characteristics of the airflow in the metal foams, such as Darcy's number, Reynolds number, and blocks size
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