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Measurement of local heat/mass transfer coefficients on a dimple using naphthalene sublimation

机译：使用萘升华法测量酒窝上的局部传热/传质系数

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摘要

Local and average heat/mass transfer characteristics on a single dimple were investigated using a naphthalene sublimation technique. The dimple depth in this study ranged from 20% to 40% of the channel height. The experimental conditions covered the range from laminar to low-velocity turbulent flow regimes, 500 ≤ ReH ≤ 5000. Secondary flows from the dimple were clearly observed in the transient flow regime of ReH = 2000-3000. The velocity fluctuation in the mixing layer over the dimple increased with the dimple depth and the Reynolds number. The impingement of the mixing layer and the induced secondary flows augmented the Sherwood number around the rear rim of the dimple and in the rear plateau region, respectively. For a Reynolds number of 3000, the Sherwood number increased significantly due to the increased fluctuation in the mixing layer and the intensified secondary flows from the dimple. The heat/mass transfer augmentation factors increased as the Reynolds number increased, reaching 1.5 at a Reynolds number of 5000.
机译：使用萘升华技术研究了单个酒窝的局部和平均传热/传质特性。本研究中的凹坑深度为通道高度的20％至40％。实验条件涵盖了从层流到低速湍流的范围，即500≤ReH≤5000。在ReH = 2000-3000的瞬变流态中，明显观察到了来自酒窝的二次流。凹坑上方混合层中的速度波动随凹坑深度和雷诺数而增加。混合层的撞击和引起的二次流分别增加了酒窝后缘周围和后高原区域的舍伍德数。对于3000的雷诺数，舍伍德数显着增加，这是由于混合层的波动增加以及来自酒窝的二次流增加所致。传热/传质增加因子随雷诺数增加而增加，在雷诺数为5000时达到1.5。

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