Acoustically augmented diffusional transport
Acoustically augmented diffusional transport
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声学增强扩散传输
DOI：
10.1121/1.1913328
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发表时间：
1973
影响因子：
2.4
通讯作者：
K. Lund
中科院分区：
文献类型：
--
作者：
Scott Fogler;K. Lund
目前的工作考虑了通过在扩散传输上叠加超声诱导的对流传输来增强质量传输。由于纳维-斯托克斯方程中的非线性，当声波穿过介质时，会产生一种称为声流的与时间相关的二次流。相邻涡旋或细胞之间，分子扩散是唯一的传输方式；然而，在每个单元内，质量传输主要通过对流进行。发现传质速率比正常扩散通量高出 150% 左右。所提出的理论分析和结果适用于可以使用超声波来增加通过膜的传质（例如透析）的系统，并提高非常活跃的催化系统和固液萃取系统的效率。
The present work considers enhancement of mass transport resulting from superimposing an ultrasonically induced convective transport on a diffusional transport. As a result of the nonlinearities in the Navier‐Stokes equation, a time‐dependent secondary flow called acoustic streaming can be produced when an acoustic wave is passed through a medium. Between adjacent vortices or cells, molecular diffusion is the only means of transport; however, within each cell, mass transport is primarily by convection. Increases in the rate of mass transfer of the order of 150% above the normal diffusional flux were found. The theoretical analysis and results presented have application to systems in which ultrasonics may be used to increase mass transfer through membranes (e.g., dialysis), and to increase the efficiency of very active catalytic systems and of solid‐liquid extraction systems.