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首页> 外文期刊>Applied thermal engineering: Design, processes, equipment, economics >Numerical and experimental analysis of heat transfer enhancement and pressure drop characteristics of laminar pulsatile flow in grooved channel with different groove lengths
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Numerical and experimental analysis of heat transfer enhancement and pressure drop characteristics of laminar pulsatile flow in grooved channel with different groove lengths

机译：不同凹槽长度沟槽通道中流动脉动流动热传递增强和压降特性的数值和实验分析

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摘要

Heat transfer enhancement and pressure drop characteristics of laminar pulsatile flow in grooved channel with different grooved lengths are investigated numerically and experimentally in the present work. The Reynolds number of the mainstream flow considered in this work ranges from 300 to 525. Two dimensional simulations are carried out to reveal the flow and heat transfer features. The numerical results demonstrate that heat transfer is enhanced in the grooved channel when the pulsatile flow is at high oscillatory fraction and a moderate frequency. It is also found that the heat transfer is improved the most in the grooved channel of l = 1.6, which is by approximately 4.74% at a Reynolds number of 300. Furthermore, five types of grooved channels are tested in experiment where the pressure drop is measured by an electro-magnetic flow-meter. The sampling data of pressure drop is analyzed by the amplitude and mean value. Both the numerical and experimental results indicate that the grooved channel of l = 1.6 performs better in terms of heat transfer enhancement while the amplitude of pressure drop and mean pressure drop in l = 1.6 are relatively lower than other grooved channels studied. Meanwhile, it is revealed that the heat transfer improves with the oscillatory fraction at low oscillatory frequency.
机译：在目前的工作中，在数值和实验上研究了具有不同沟槽长度的带槽通道中层状脉动流动的热传递增强和压降特性。在该工作中考虑的主流流程的雷诺数范围为300至525.进行了二维模拟，以揭示流动和传热特征。数值结果表明，当脉动流量处于高振荡级分和适度频率时，在带槽通道中增强了传热。还发现，在L = 1.6的带槽通道中，传热在最大化的沟槽通道中提高，这在雷诺数为300的曲折号中。此外，在压力下降的实验中测试了五种类型的沟槽通道通过电磁流量计测量。通过幅度和平均值分析压降的采样数据。数值和实验结果表明，L = 1.6的带槽通道在传热增强方面表现更好，而L = 1.6的压降和平均压降的幅度比研究的其他沟槽通道相对较低。同时，揭示了热传递在低振荡频率下改善了振荡级分。

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