マッハ・ツェンダ画像による非定常二次元温度場の実験解析

抄録

A measurement method of an unsteady temperature field by using a Mach-Zehnder interferometer and an image-processing technique was presented. In this study, the results measured by this method were compared with the calculated results under Reynolds numbers(Re= UL/v) ranging to less than 350 in the steady state. The unsteady characteristics of the local Nusselt numbers (Nu_χ=αχL/λ) around an elastically vibrating plate were investigated under the conditions that the reduced frequency (N=1/Ro) ranged from 4.8 to 8.6 and the amplitude of vibration was kept small relative to the plate-length. In this study it was clarified that the distributions of the local Nusselt numbers were observed flutteringly, and that the phase of the time averaged Nusselt number is delayed compared to the phase of the velocity at the trailing edge. These results indicate that the enhancement of the time-averaged heat transfer coefficient around the vibrating plate depended on the Rossby number.