Abstract

An attempt is made to resolve a long standing difference in the predicted distribution of the eddy diffusivity in the viscous sublayer, where the literature shows a dependence on either the cube or the fourth power of the distance from a solid wall. The resolution suggested is that a y³ dependence prevails very close to the wall while a y⁴ dependence may prevail in the outer part of the viscous sublayer near the border with the outer turbulent flow. However, at high values of the Schmidt number, the overall mass-transfer rate will show behavior corresponding to the y³ dependence, and any hints of the y⁴ dependence would be very hard to observe experimentally.

中文翻译：

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粘性子层中的涡流扩散率

抽象的

试图解决粘性子层中涡流扩散率的预测分布中的长期差异，其中文献显示了与实心壁距离的三次方或四次方的依赖性。建议的分辨率是，y ³依赖性在非常靠近壁的位置占主导，而y ⁴依赖性可能在粘性子层的外部（靠近外部湍流边界）附近占主导地位。但是，在高施密特数的情况下，整体传质速率将表现出与y ³依赖性相对应的行为，并且任何y ⁴依赖性的暗示都很难通过实验观察到。