Abstract
Heat enhancement and heat removal remain important topics in engineering. Furthermore, flow in a laminar regime can reduce the cost of cooling. In the present study, flow in mini channels in a rectangular cavity is investigated with water as a circulating fluid. The height of the channel in the cavity is varied and interaction of the free flow above the channel with flow through the channel has been investigated. It is shown that a combination of these two flows can provide the optimum heat removal at a Reynolds number of 750. This finding is valid if one ignores the friction effect to the wall. The best configuration is for an aspect ratio AR = 6. If the pressure drop is taken into consideration, then the performance evaluation criterion shows that the mini-channel with aspect ratio AR = 12 is the best configuration. Different correlations have been obtained between the Nusselt number, pressure drop, friction factor, performance evaluation criterion, and the Reynolds number and the height of the channels.
Highlights
Energies 2021, 14, 7020. https://Experimental and numerical analysis of heat transfer enhancement in porous and clear channels has received a lot of attention lately
The model wasThe investigated for five laminar, differentand flowarates corresponding to aisReynolds layers is imminent
An effort is focused on investigating the importance of minichannel height in heat enhancement
Summary
Experimental and numerical analysis of heat transfer enhancement in porous and clear channels has received a lot of attention lately. Water used in some analysis has been replaced with nanofluid and hybrid nanofluid since this new type of fluid has higher thermal conductivity On one hand, it enhances further the heat removal by 5% to 7% but at the expense of a large friction factor. Regardless of the fluid to be used, it was found that the thermal and velocity boundary layers reduce further the heat rate removal To overcome this problem different twisted tape shape was introduced. Energies 2021, 14, 7020 tape inserts enhances the heat transfer performance, and increases the pressure drop 2 of 13 when compared to a mini channel without twisted tape.
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