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首页> 外文期刊>International journal of heat and fluid flow >Experimental and numerical study of developed flow and heat transfer in coolant channels with 45 degree ribs
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Experimental and numerical study of developed flow and heat transfer in coolant channels with 45 degree ribs

机译：45度肋骨冷却液通道中流动和传热的实验和数值研究

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摘要

The flow characteristics within coolant channels were investigated experimentally and numerically to assess the current capability of Navier-Stokes codes to predict flow and heat transfer in coolant passages. The assessment was made for developed flows in a stationary square coolant channel with opposing square ribs staggered and angled at 45 degrees to the duct centerline, with rib heights of 10 of the channel height and with a Reynolds number of 50 000. A stereoscopic digital PIV measurement system was assembled to simultaneously measure all three-velocity components in narrow sheets. The instantaneous PIV data were averaged to obtain the three mean velocities and the six Reynolds stresses. Velocity and heat transfer distributions were calculated for developed flow in one segment of the ribbed channels by applying cyclic boundary conditions. The calculations were made with three sets of wall and turbulence models: (1) a standard k-ε turbulence model with wall functions, (2) a differential-Reynolds-stress turbulence model with wall functions and (3) a standard k-ε turbulence model with a two-layer wall model. The comparison between the measurements and the calculations showed a good qualitative agreement. The heat transfer and friction were compared to correlations for a similar configuration found in the literature. The comparison showed that the RSM results were more consistent with the experimental results than the k-ε results with and without wall functions.
机译：通过实验和数值研究了冷却剂通道内的流动特性，以评估纳维-斯托克斯码当前预测冷却剂通道中流动和传热的能力。该评估是针对静止方形冷却液通道中的显影流量进行的，该通道的相对方肋与管道中心线呈 45 度角，肋高为通道高度的 10%，雷诺数为 50 000。组装了一个立体数字PIV测量系统，以同时测量窄片中的所有三速分量。对瞬时PIV数据进行平均，得到3个平均速度和6个雷诺应力。通过应用循环边界条件，计算了肋状通道一段中发展流动的速度和传热分布。使用三组壁和湍流模型进行计算：（1）具有壁函数的标准k-ε湍流模型，（2）具有壁函数的微分雷诺应力湍流模型和（3）具有两层壁模型的标准k-ε湍流模型。测量结果和计算结果的比较显示出良好的定性一致性。将传热和摩擦与文献中发现的类似构型的相关性进行了比较。比较表明，RSM结果与实验结果的一致性高于有和无壁函数的k-ε结果。

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