B213 強制振動する立方体容器内の熱対流における振幅効果(OS8 熱流動),動力エネルギーシステム部門20周年,次の20年への新展開)

概要

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In the present study, the authors conduct a series of numerical analyses on the forced-oscillation-frequency responses of the convection in a cubic cavity heated below in the gravitational field with Pr=7.1 and Ra=1.0×10^4. The forced oscillation is sinusoidal and parallel to the terrestrial gravity. The authors focus their special attention on the amplitude effects of the forced oscillation upon kinetic energy, the optimum frequency and flow structure. The obtained results are as follows. Even at large acceleration amplitudes, the optimum frequency exists. And at the optimum frequency, periodicity is exact, while the wave form is far from sinusoidal at a non-dimensional acceleration amplitude η≥1. A boundary exists at η=1.5, where both the increasing rate of a spatially-averaged kinetic energy and the flow structure change abruptly, and where the optimum frequency attains the minimum. This abrupt change in the flow structure can be explained by an indicial response.
一般社団法人日本機械学会の論文
2010-06-20