D-232 定在波音場が重なる熱対流場の密度・温度分布計測

概要

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Heat transfer by natural convection generated in a both-end-closed duct with rectangular cross-section is one of the fundamental engineering problems. The convection is induced by the upward inverse gradient of temperature in the horizontal duct. The pattern of convection eurrents is characterized by Rayleigh number. When an acoustic standing wave is superimposed on an unsteady thermal convection generating at high Rayleigh number in the duct, the unsteady convection is constrained into a range of steady, two-dimensional roll type structure characterized by 1/4 wavelength of the sound. The temperature distribution obtained by the coupling is important information to understand the effect of sound field on the thermal convection. For this purpose, the temperature field is estimated indirectly by the density field measurements of the coupling convection currents by using digital laser speckle photography based on the digital cross-correlation evaluation between the reference and the object speckle patterns, which are separately recorded.
2003-07-28