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On flow structures associated with large wall mass transfer coefficients in orifice flows

机译:与孔壁中大壁传质系数相关的流动结构

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In this study, the turbulent flow field is simultaneously measured by stereoscopic particle image velocimetry (SPIV) and the wall mass transfer coefficient using the limiting diffusion current technique (LDCT). SPIV measurements of the flow field behind an orifice in a round pipe are performed in the cross and longitudinal sections. One-point linear and quadratic stochastic estimations are employed to calculate the conditional average of the flow field associated with the large wall mass transfer coefficient. The results suggest that the counter-rotating vortex pairs play an important role in the large wall mass transfer coefficient. The flow structures associated with a large wall mass transfer coefficient in the cross sections are found to be similar to the flow structures enhancing the wall heat transfer obtained by a theoretical analysis and numerical study in literature.
机译:在这项研究中,湍流场是通过立体粒子图像测速仪(SPIV)和壁质量传递系数使用极限扩散电流技术(LDCT)同时测量的。在圆形和纵向截面中执行圆管孔口后流场的SPIV测量。采用一点线性和二次随机估计来计算与大壁传质系数相关的流场的条件平均值。结果表明,反向旋涡对在较大的壁传质系数中起重要作用。发现在横截面上与大的壁传质系数相关的流动结构类似于通过理论分析和文献中的数值研究获得的增强壁传热的流动结构。

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