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首页> 外文期刊>International Journal of Heat and Fluid Flow >Numerical analysis of fluid flow and heat transfer in periodic wavy channels
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Numerical analysis of fluid flow and heat transfer in periodic wavy channels

机译：周期性波浪通道内流体流动和传热的数值分析

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摘要

The two-dimensional steady and time-dependent fluid flow and heat transfer through periodic, wavy channels is numerically studied. For a fluid with a Prandtl number of 0.7, by means of an unstructured covolume method. The two geometrical configu- rations considered, a sinusoidal channel and an arc-shaped channel, are shown to provide little or no heat transfer augmentation, in comparison to a parallel-plate channel, in steady flow regimes at lower values of the Reynolds number. In addition, they both have higher pressure drop than that of the parallel-plate channel under fully developed flow conditions. For the unsteady regime, reached at about Re=175-200 for the sinusoidal channel, and Re=60-80 for the arc-shaped channel, both geometries exhibit a significant increase in the heat transfer rate, up to three times for the highest Reynolds number investigated. This increase is higher for the arc- shaped flow passage, but is accompanied by a higher friction factor than that of the sinusoidal channel.
机译：数值研究了通过周期性波浪通道的二维稳态和随时间变化的流体流动和热传递。对于普朗特数为0.7的流体，采用非结构化体积法。在平行流板通道中，在较低的雷诺数下，与平行板通道相比，所考虑的两个几何构型（正弦形通道和弧形通道）几乎不提供传热增强。此外，在充分发展的流动条件下，它们都比平行板通道具有更高的压降。对于不稳定状态，正弦通道的传热速率约为Re = 175-200，弧形通道的传热速率约为Re = 60-80，两种几何形状均表现出传热速率的显着提高，最高传热速率可达到三倍雷诺数被调查。对于弧形流动通道，这种增加更高，但是伴随着比正弦通道更高的摩擦系数。

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