Abstract
Flow patterns and wall shear stresses in periodically grooved channels were studied in the transitional flow regime. In order to examine the effect of groove length, we employed three different channels. It is found that self-sustained flow oscillation occurs at a lower Reynolds number as the groove length is increased. The flow instability arises from Tollmien-Schlichting waves triggered by a shear layer between the bulk flow and groove flow, which is confirmed by numerical simulation. A significant increment in the wall shear stresses is identified after the onset of flow instability, and mass transfer is enhanced.
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