BOUNDARY-LAYER LENGTH SCALES IN THERMAL TURBULENCE

被引：74

作者：

BELMONTE, A ^{[1
]}

TILGNER, A ^{[1
]}

LIBCHABER, A ^{[1
]}

机构：

[1] NEC RES INST,PRINCETON,NJ 08540

来源：

PHYSICAL REVIEW LETTERS | 1993年 / 70卷 / 26期

关键词：

D O I：

10.1103/PhysRevLett.70.4067

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We present measurements of local temperature fluctuations from a convection cell of aspect ratio 1, using gas at room temperature, for Rayleigh numbers (Ra) ranging from 5 x 10(5) to 1 x 10(11). The thermal boundary layer thickness is measured; its scaling is close to Ra-2/7 for Ra > 2 x 10(7). A second length scale is measured through the cutoff frequency of the power spectrum, which we relate to the velocity of the large scale circulation. The Rayleigh number dependence of this length changes at Ra=2 x 10(9).

引用

收藏

页码：4067 / 4070

页数：4

相关论文

共 13 条

[1]

BELMONTE A, UNPUB

[2] TURBULENT CONVECTION IN A HORIZONTAL LAYER OF WATER [J].

CHU, TY ;

GOLDSTEI.RJ .

JOURNAL OF FLUID MECHANICS, 1973, 60 (AUG21) :141-&

[3] LARGE-SCALE FLOW GENERATION IN TURBULENT CONVECTION [J].

KRISHNAMURTI, R ;

HOWARD, LN .

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA-PHYSICAL SCIENCES, 1981, 78 (04) :1981-1985

[4] DISCRETE TRANSITIONS IN TURBULENT CONVECTION [J].

MALKUS, WVR .

PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON SERIES A-MATHEMATICAL AND PHYSICAL SCIENCES, 1954, 225 (1161) :185-195

[5] TURBULENCE IN HELIUM-GAS FREE-CONVECTION [J].

SANO, M ;

WU, XZ ;

LIBCHABER, A .

PHYSICAL REVIEW A, 1989, 40 (11) :6421-6430

[6] HEAT-TRANSPORT IN HIGH-RAYLEIGH-NUMBER CONVECTION [J].

SHRAIMAN, BI ;

SIGGIA, ED .

PHYSICAL REVIEW A, 1990, 42 (06) :3650-3653

[7] TURBULENT CONVECTION OVER A HEATED HORIZONTAL SURFACE [J].

THOMAS, DB ;

TOWNSEND, AA .

JOURNAL OF FLUID MECHANICS, 1957, 2 (05) :473-492

[8] FREE CONVECTION IN LOW-TEMPERATURE GASEOUS HELIUM [J].

THRELFALL, DC .

JOURNAL OF FLUID MECHANICS, 1975, 67 (JAN14) :17-28

[9] TEMPERATURE AND VELOCITY PROFILES OF TURBULENT CONVECTION IN WATER [J].

TILGNER, A ;

BELMONTE, A ;

LIBCHABER, A .

PHYSICAL REVIEW E, 1993, 47 (04) :R2253-R2256

[10] CONFIRMATION AND RENUMBERING OF DISCRETE HEAT FLUX TRANSITIONS OF MALKUS [J].

WILLIS, GE ;

DEARDORF.JW .

PHYSICS OF FLUIDS, 1967, 10 (9P1) :1861-&