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首页> 外文期刊>International Journal of Heat and Mass Transfer >Enhanced heat transfer due to curvature-induced lateral vortices in laminar flows in sinusoidal corrugated-plate channels
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Enhanced heat transfer due to curvature-induced lateral vortices in laminar flows in sinusoidal corrugated-plate channels

机译：在正弦波纹板通道的层流中由于曲率引起的侧向涡流而增强传热

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摘要

Laminar periodically developed forced convection in sinusoidal corrugated-plate channels with uniform wall temperature, and single-phase constant property flows is considered. Numerical solutions are obtained using the control-volume finite-difference method for a wide range of channel corrugation aspect ratios (0 ≤γ≤ 1), and flow rates (10≤Re≤1000) of viscous liquids (Pr = 5, 35, and 150). The flow field is found to be strongly influenced by y and Re, and it displays two distinct regimes: a low Re or γ undisturbed laminar-flow regime, and a high Re or γ swirl-flow regime. In the no-swirl regime, the flow behavior is very similar to that in fully developed straight-duct flows with no cross-stream disturbance. In the swirl regime, flow separation and reattachment in the corrugation troughs generates transverse vortex cells that grow spatially with Re and γ, and the transition to this regime also depends on Re and γ. The mixing produced by these self-sustained transverse vortices is found to significantly enhance the heat transfer, depending upon γ, Re, and Pr, with a relatively small friction factor penalty. The consequent exchanger compactness and heat transfer enhancement effectiveness (j/f) is uP to 5.5 times that for parallel-plate channels.
机译：层流在壁温均匀的正弦波纹板通道中周期性发展的强迫对流，并考虑了单相恒定特性流。使用控制体积有限差分法获得了宽范围的通道波纹长宽比（0≤γ≤1）和粘性液体的流量（10≤Re≤1000）（Pr = 5，35，和150）。发现流场受y和Re强烈影响，并且显示出两种不同的状态：低Re或γ无扰动层流状态和高Re或γ旋流状态。在无旋流状态下，流动行为与完全发展的直管流动非常相似，没有横流干扰。在涡旋状态下，波纹槽中的流分离和重新附着会产生横向涡流单元，这些涡流单元在空间上随Re和γ的增长而增长，并且向该模式的过渡也取决于Re和γ。发现这些自持的横向涡流产生的混合可显着增强热传递，取决于γ，Re和Pr，且摩擦系数损失相对较小。因此，交换器的紧凑性和传热增强效率（j / f）为平行板通道的uP至5.5倍。

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