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Journal of Enhanced Heat Transfer
IF: 1.406 5-Year IF: 1.075 SJR: 0.287 SNIP: 0.653 CiteScore™: 1.2

ISSN Print: 1065-5131
ISSN Online: 1563-5074

Journal of Enhanced Heat Transfer

DOI: 10.1615/JEnhHeatTransf.v5.i1.30
pages 23-37

Fluid Mixing and Mass Transfer Enhancement in Grooved Channels for Pulsatile Flow

Tatsuo Nishimura
Department of Mechanical Engineering, Yamaguchi University, Ube 755, Japan
Koji Kunitsugu
Department of Mechanical Engineering, Yamaguchi University, Ube 755, Japan
Alexandru M. Morega
Department of Mechanical Engineering, Yamaguchi University, Ube 755, Japan

ABSTRACT

Fluid mixing and mass transfer in grooved channels were studied experimentally and numerically for pulsatile flow with varying flow parameters. A particle advection procedure by numerical simulation indicates that vortex dynamics due to time-periodic flows lead to efficient fluid exchange between channel and groove flows. Mass transfer rates were measured by the electrochemical method. The mass transfer enhancement factor increases with the oscillatory fraction of the flow rate, and depends on the net flow rate and oscillatory frequency. It is found that at high Reynolds numbers this factor suddenly increases at a low oscillatory fraction, in contrast to the cases at low Reynolds numbers.


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