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首页> 外文期刊>International Journal of Heat and Mass Transfer >Augmented longitudinal diffusion in grooved tubes for oscillatory flow
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Augmented longitudinal diffusion in grooved tubes for oscillatory flow

机译：沟槽管中的纵向扩散增强，产生振荡流

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摘要

This paper presents the results of an experimental investigation on longitudinal mass diffusion in the tubes roughened by equidistantly-spaced grooves during oscillatory flows of Reynolds number = 210 13,000 and Womersley number = 3.76-10.64. The experiments were conducted in tubes of 6 mm nominal ID using a soluble contaminant of molecular diffusion coefficient = 2.78 × 10~-5 cm~2/s as the tracer. The experiments show that, in comparison with the smooth one, the grooved tubes could yield an augmentation of up to about two orders of magnitude in effective diffusion rate for our investigation. The present results indicate that, for high Reynolds number flows, the ratio of the volume of core region to that of grooves influence the longitudinal diffusion efficiency in a tuning behavior. the grooved tube in which the core region is equal to grooves in volume performs best in enhancing the axial mass diffusion.
机译：本文介绍了在雷诺数= 210 13,000和沃默斯利数= 3.76-10.64的振荡流动过程中，由等距间隔开槽粗糙化的管中纵向质量扩散的实验研究结果。实验在标称内径为6 mm的试管中进行，使用分子扩散系数= 2.78×10〜-5 cm〜2 / s的可溶性污染物作为示踪剂。实验表明，与光滑管相比，带槽管的有效扩散速率最多可增加两个数量级，以供我们研究。目前的结果表明，对于高雷诺数流，核心区域的体积与凹槽的体积之比会影响调谐行为中的纵向扩散效率。芯区域等于凹槽的凹槽管在增强轴向质量扩散方面表现最佳。

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