鉛直平行平板間の自然対流場の準定常性とカオス性

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In this paper the time-dependent characteristics of the natural convection in a vertical slot with hot and cold side walls were experimentally examined. In the experiment test liquid was glycerine-water mixture (80 wt%) and the Prandtl number in the center of the slot was held constant of 295. The Grashof number was changed in the range between 370 and 3.06×10^3. As a result, it was revealed that the low pass filtering for the time evolution data of temperature made it possible to compute the largest Lyapunov exponents precisely. The region of the secondary flow cells was divided into the chaotic region and the non-chaotic One. Moreover the secondary flow cells appeared in the region in which the power spectrum of temperature fluctuation was regarded as significant and the region in which the auto-correlation coefficient decreased rapidly with time.
一般社団法人日本機械学会の論文
1999-02-25