Mass Transfer Enhancement by Pulsatile Flows in Grooved Channels (The Effects of Groove Length on the Resonant Mass Transfer Enhancement)

Abstract

The effect of groove length on the resonant mass transfer enhancement by pulsatile flow in grooved channel at intermediate Reynolds number is studied for five channels by experimental methods. The mass transport process from the bottom of groove to the channel were visualized by electrolytic precipitation method and also overall and local mass transfer rates were measured by electrochemical method with a high Schmidt number fluid. The qualitative and quantitative observations show that the range of Strouhal number which gives inertia-dominated flow is extended to low value region with groove length. Moreover, it is revealed that a noticeable enhancement is obtained in a specific channel at a Reynolds number and the wide range of Strouhal number. The result means that there is the proper Reynolds number for transfer enhancement in a channel.