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首页> 外文期刊>International Journal of Heat and Mass Transfer >lnfluence of imposed oscillatory frequency on mass transfer enhancement of grooved channels for pulsatile flow
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lnfluence of imposed oscillatory frequency on mass transfer enhancement of grooved channels for pulsatile flow

机译：振荡频率对脉动流槽通道传质增强的影响

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摘要

The present experimental study describes mass transfer enhancement in grooved channels with different cavity lengths for pulsatile flow. Overall and local mass transfer rates were measured by the electrochemical method with a high Schmidt number and also the vortical motion within the groove was visualized by the electrolytic precipitation method. We especially focused on the influence of oscillation frequency on mass transport enhancement. Transport enhancement by means of fluid oscillation is found to be higher in laminar flow than in turbulent flow. There is a noticeable enhancement at intermediate Strouhal numbers, depending on the cavity length and the net flow Reynolds number. It is revealed that the mechanism for a peak transport enhancement factor against Strouhal number is not explained by the hydrodynamic resonance proposed by Patera and Mikic, under a certain condition.
机译：本实验研究描述了在脉动流不同腔长的沟槽通道中传质的增强。通过具有高施密特数的电化学方法测量整体和局部传质速率，并且通过电解沉淀法使凹槽内的涡旋运动可视化。我们特别关注振荡频率对传质增强的影响。发现在层流中借助于流体振荡的传输增强比在湍流中更高。在中间的Strouhal数上有明显的增强，具体取决于模腔的长度和净流雷诺数。结果表明，在一定条件下，Patera和Mikic提出的流体动力学共振并不能解释针对Strouhal数的峰值输运增强因子的机理。

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