Extraction of plumes in turbulent thermal convection
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摘要We present a scheme to extract the velocity of buoyant structures in turbulent thermal convection from simultaneous local velocity and temperature measurements. Applying this scheme to measurements taken at positions within the convection cell where the buoyant structures are dominated by plumes, we obtain the temperature dependence of the plume velocity and understand our results using the equations of motion. We further obtain the scaling behavior of the average local heat flux in the vertical direction at the cell center with the Rayleigh number and find that the scaling exponent is different from that measured for the Nusselt number. This difference leads to the conclusion that heat cannot be mainly transported through the central region of the convection cell.
著者Ching ESC, Guo H, Shang XD, Tong P, Xia KQ
期刊名稱Physical Review Letters
出版年份2004
月份9
日期17
卷號93
期次12
出版社AMER PHYSICAL SOC
國際標準期刊號0031-9007
電子國際標準期刊號1079-7114
語言英式英語
Web of Science 學科類別Physics; Physics, Multidisciplinary; PHYSICS, MULTIDISCIPLINARY

上次更新時間 2020-22-10 於 00:49