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The objective of the present paper is to investigate Reynolds number dependence of separation and reattachment process over a backward facing step in a low Reynolds number range. A study on low Reynolds number flow such as the flow around the micro device is strongly required in MEMS development. The Reynolds number based on step height is set at 133 to 3690 in a micro sensing wind tunnel. The reattachment and separation points are determined from the detailed measurement on forward flow fraction by Micro Flow Sensor, and the vortex structure is visualized with a high speed video camera. The results show a strong dependence of Reynolds number on the flow behavior on the step and opposite-side wall downstream of the step.

A Backward Facing Step Flow in Low Reynolds Number (Time-Average Behaviour of Near-Wall Flow in Separating and Reattachment Region)