Statistics of the locally averaged thermal dissipation rate in turbulent Rayleigh-Benard convection
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AbstractFrom 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.
All Author(s) ListHe XZ, Tong PG, Ching ESC
Journal nameJournal of Turbulence
Year2010
Month1
Day1
Volume Number11
Issue Number35
PublisherTaylor & Francis: STM, Behavioural Science and Public Health Titles
Pages1 - 10
ISSN1468-5248
LanguagesEnglish-United Kingdom
Keywordsturbulent convection
Web of Science Subject CategoriesMechanics; MECHANICS; Physics; Physics, Fluids & Plasmas; PHYSICS, FLUIDS & PLASMAS

Last updated on 2020-17-09 at 00:54