Extraction of plumes in turbulent thermal convection
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AbstractWe 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.
All Author(s) ListChing ESC, Guo H, Shang XD, Tong P, Xia KQ
Journal namePhysical Review Letters
Year2004
Month9
Day17
Volume Number93
Issue Number12
PublisherAMER PHYSICAL SOC
ISSN0031-9007
eISSN1079-7114
LanguagesEnglish-United Kingdom
Web of Science Subject CategoriesPhysics; Physics, Multidisciplinary; PHYSICS, MULTIDISCIPLINARY

Last updated on 2020-21-09 at 01:20