BOUNDARY-LAYER LENGTH SCALES IN CONVECTIVE TURBULENCE

Authors
XIN YB XIA KQ
Citation
Yb. Xin et Kq. Xia, BOUNDARY-LAYER LENGTH SCALES IN CONVECTIVE TURBULENCE, Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics, 56(3), 1997, pp. 3010-3015
Citations number
33
Categorie Soggetti
Physycs, Mathematical","Phsycs, Fluid & Plasmas
Journal title
Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics → ACNP
ISSN journal
1063651X
Volume
56
Issue
3
Year of publication
1997
Part
A
Pages
3010 - 3015
Database
ISI
SICI code
1063-651X(1997)56:3<3010:BLSICT>2.0.ZU;2-H
Abstract
Profiles of both the mean value and the standard deviation of the loca l fluctuating velocity in turbulent convection in water have been dire ctly measured using a light Scattering technique. Scaling laws with th e Rayleigh number Ra for various boundary layer quantities have been e stablished over the range of Ra from 2.4 x 10(7) to 1.1 x 10(11), whil e the variation of the Prandtl number was kept at minimum (Pr similar or equal to 7). In particular, a new boundary layer length scale is id entified from the standard deviation profile, and is found to scale as delta(sigma)similar to Ra-0.25, whereas the velocity boundary layer t hickness delta(upsilon)similar to Ra-0.16.