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首页> 外文期刊>International Journal of Heat and Mass Transfer >Effect of buoyancy on turbulent convection heat transfer in corrugated channels - A numerical study
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Effect of buoyancy on turbulent convection heat transfer in corrugated channels - A numerical study

机译：浮力对波纹通道内湍流对流换热的影响-数值研究

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摘要

Convection heat transfer of turbulent flow between two corrugated plates in the presence of buoyancy is numerically investigated. Three different channel geometries, with width-to-pitch ratios equal to 0.2, 0.32 and 0.5 are investigated for Reynolds numbers ranging between 2200 and 13,500. The results show that, for buoyancy-aided flows, the heat transfer decreases with Grashoff number until a certain point where it starts to recover. For buoyancy-opposed flows, heat transfer monotonically increases with Crashoff number. It is the same trend as has already been reported in the literature for vertical pipes; however, for the same Reynolds number, the critical Grashoff number at which buoyancy can affect the heat transfer in a corrugated channel is higher. These Grashoff numbers increase with the width-to-pitch ratio of the channel. If the wall heat flux (thus Grashoff number) is kept constant, Reynolds number must be 3-7 times smaller in corrugated channels with aspect ratios of 0.2-0.5, respectively, compared to a vertical pipe so that buoyancy can affect heat transfer.
机译：对存在浮力的两个波纹板之间湍流的对流换热进行了数值研究。研究了雷诺数在2200和13,500之间的三种不同的通道几何结构，宽宽比等于0.2、0.32和0.5。结果表明，对于浮力辅助流，传热随着格拉索夫数的增加而减小，直到某一点开始恢复。对于浮力相反的流，传热随着Crashoff数单调增加。这与文献中有关立管的趋势相同。但是，对于相同的雷诺数，浮力会影响波纹通道中的热传递的临界Grashoff数更高。这些Grashoff数随通道的宽高比而增加。如果保持壁热通量（因此Grashoff数）恒定，则与垂直管相比，宽高比分别为0.2-0.5的波纹通道的雷诺数必须小3-7倍，以便浮力会影响传热。

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