平板の弾性振動による能動的境界層制御

概要

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The experimental study of the heat and mass transfer around an elastically vibrating plate has been conducted in forced convective channel flow. Measurement of the unsteady velocity and temperature fields were made by using a laser-Doppler anemometer and Mach-Zehnder interferometer, respectively. The experiment was performed under Reynolds numbers (Re=Ud/ν) ranging from 130 to 350 and Strouhal numbers (St=ωL/U) ranging from 6.9 to 12.2. In this study, it is observed that the fluid near the wall was accelerated by the centrifugal and the Coriolis forces generated by the elastic vibration of the plate when the amplitude is kept small relative to the length of the plate. Moreover, it is found that the time-averaged heat transfer around the vibrating flat plate increased significantly, particularly near the trailing edge. Therefore, it was clarified that the application of an elastic vibration is effective in active boundary layer control for heat transfer enhancement.
1995-05-25