振動平板と気液界面に挟まれた一次元空間内を伝播する音波に関する分子気体力学解析(分子スケール(3),一般講演)

概要

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The behavior of sound in a finite one-dimensional space between an oscillating plate (sound source) and a vapor-liquid interface is analyzed by applying the asymptotic theory for small Knudsen number. The result shows that the gas region is consists of the three regions of the linear isentropic sound region, the thermal boundary layer and the Knudsen layer. From the analytical solution in the time-periodic case, we found that the amplitude of the sound decreases with increase in the evaporation coefficient α at the interface. When the evaporation coefficient is unity, almost 80 percent of sound wave incident on the interface is absorbed there. Near the resonant point, the pressure amplitude of sound source rapidly increases with decrease in α.
日本流体力学会の論文
2008-09-04