Mean wind: Its velocity and temperature fluctuation in low-Prandtl-number thermal convection

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• 作者：Tomohiro Hayakawa^a ; Yoshiyuki Tsuji ; ^a ; ^{c42406a@nucc.cc.nagoya-u.ac.jp"" rel=""nofollow}
• 关键词：Thermal convection ; Low- ; none ; color ; black"" href=""/science?_ob=MathURL&_method=retrieve&_udi=B6TVK-4YFK2SM-1&_mathId=mml73&_pii=S0167278910000576&_issn=01672789&_acct=C000056894&_version=1&_userid=8734945&md5=c
• 刊名：Physica D
• 出版年：2010
• 出版时间：15 July 2010
• 年：2010
• 卷：239
• 期：14
• 页码：1353-1358
• 全文大小：912 K

文摘

Large-scale circulation in the confined thermal turbulence of mercury is studied experimentally. The instantaneous velocity profile at 128 points is directly measured using ultrasonic velocimetry and the temperature fluctuation is simultaneously obtained by a small thermistor at the cell center. The periodic velocity oscillation is observed for aspect ratios Γ=1,2, but for Γ=0.5. The temperature oscillation is confirmed only in the Γ=2 cell. It is found that the flow patterns depending on the aspect ratio are characterized sufficiently by the joint probability density function up to Ra=4×10⁸.