Local Heat/Mass Transfer and Friction Loss Measurement in a Rotating Matrix Cooling Channel
Local Heat/Mass Transfer and Friction Loss Measurement in a Rotating Matrix Cooling Channel
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DOI：
10.1115/gt2009-59873
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发表时间：
2009
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影响因子：
--
通讯作者：
I. Oh;K. Kim;Dong Hyun Lee;J. S. Park;H. Cho
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文献类型：
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作者：
I. Oh;K. Kim;Dong Hyun Lee;J. S. Park;H. Cho
本研究提供了详细的局部传热/传质分布和压降特性矩阵冷却通道旋转条件下。基体通道具有交叉角为45度的冷却子通道。详细的热/质传递系数测量使用萘升华法。还测量了压降。实验在不同的雷诺数（10，000至44，000）和旋转数（0.0至0.8）下进行。对于静止情况，换热特性主要是由矩阵通道几何形状引起的转向、撞击和旋转流动所支配。在固定通道中的前表面和后表面上的平均热/质传递系数是光滑通道中的平均热/质传递系数的约2.1倍。对于旋转情况，旋转对传热传质特性的影响与典型的径向向外流动的旋转通道相比表现出不同的趋势。随着旋转数的增加，前表面上的舍伍德数比增加，但在后表面上变化不大。由于舍伍德数比增加和摩擦系数比降低，热性能系数随旋转次数增加而增加。
The present investigation provides detailed local heat/mass transfer distribution and pressure drop characteristics in a matrix cooling channel under rotating conditions. The matrix channel has cooling sub-passages with crossing angle of 45 degrees. Detailed heat/mass transfer coefficients are measured using the naphthalene sublimation method. The pressure drops are also measured. The experiments were conducted under various Reynolds numbers (10,000 to 44,000) and rotation numbers (0.0 to 0.8). For the stationary case, the heat transfer characteristics are dominated by turning, impinging and swirling flow which are induced by the matrix channel geometry. Averaged heat/mass transfer coefficients on the leading and trailing surfaces in the stationary channel are approximately 2.1 times higher than those in a smooth channel. For the rotating cases, the effect of rotation on heat/mass transfer characteristics shows different tendency compared to typical rotating channels with radially outward flow. As the rotation number increases, the Sherwood number ratios increase on the leading surface, but changed slightly on the trailing surface. The thermal performance factors increases with increasing rotation numbers due to increased Sherwood number ratios and decreased friction factor ratios.Copyright © 2009 by ASME