有限振幅気柱振動に伴う非線形現象 : 第4報, 音響流と熱対流との複合現象

抄録

A strong sound field produced in an air-filled tube generates steady pressure distribution, acoustic streaming and thermoacoustic effect as nonlinear phenomena of the finite-amplitude oscillation of air column in the tube. One of the applications of these phenomena is the promotion of heat convection in an air-filled duct, When a sound field is superimposed on a Taylor-Benard convection generated in a horizontal duct, coupling of acoustic streaming and thermoacoustic effect with the convection is experimentally observed as the change in structure of the convection field, and it promotes heat transfer. This paper describes a quantitative analysis of the coupling phenomena using a numerical method. The calculated results show the variations of velocity, acoustic Reynolds stress and temperature distributions in the Stokes layer with different values of temperature difference between the upper and lower walls of the duct. With these results, the effects of coupling of acoustic streaming and thermoacoustic effect with convection are discussed.