Statistics of the locally averaged thermal dissipation rate in turbulent Rayleigh-Benard convection
Publication in refereed journal

香港中文大學研究人員

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摘要From the measured thermal dissipation rate in turbulent Rayleigh-Benard convection in a cylindrical cell, we construct a locally averaged thermal dissipation rate f by averaging over a time interval . We study how the statistical moments <(f)p > depend on at various locations along the vertical axis of the convection cell. We find that <(f)p > exhibits good scaling in , of about a decade long, with scaling exponents (p) for p = 1-6. For Rayleigh number (Ra) around 8x109, the scaling range is 1.4-21 s at the cell center and 4-21 s at the bottom plate. The dissipative and turnover times are about 0.8 s and 35 s respectively, while the timescale corresponding to the local Bolgiano scale is estimated to be about 31 s at the cell center and 3.5 s at the bottom plate. On the basis of several assumptions, we derive theoretical predictions for (p) at the different locations. The measured values of (p) are presented and shown to be in good agreement with our theoretical predictions.
著者He XZ, Tong PG, Ching ESC
期刊名稱Journal of Turbulence
出版年份2010
月份1
日期1
卷號11
期次35
出版社Taylor & Francis: STM, Behavioural Science and Public Health Titles
頁次1 - 10
國際標準期刊號1468-5248
語言英式英語
關鍵詞turbulent convection
Web of Science 學科類別Mechanics; MECHANICS; Physics; Physics, Fluids & Plasmas; PHYSICS, FLUIDS & PLASMAS

上次更新時間 2020-17-10 於 00:10