Spectra and probability distributions of thermal flux in turbulent Rayleigh-Benard convection

被引：4

作者：

Pharasi, Hirdesh K. ^{[1
]}

Kumar, Deepesh ^{[2
]}

Kumar, Krishna ^{[3
]}

Bhattacharjee, Jayanta K. ^{[4
]}

机构：

[1] Doon Univ, Dept Phys, Dehra Dun 248001, Uttar Pradesh, India

[2] Univ Alberta, Dept Chem & Mat Engn, Edmonton, AB T6G 2V4, Canada

[3] Indian Inst Technol, Dept Phys, Kharagpur 721302, W Bengal, India

[4] Harish Chandra Res Inst, Allahabad 211019, Uttar Pradesh, India

来源：

PHYSICS OF FLUIDS | 2016年 / 28卷 / 05期

关键词：

SMALL-SCALE PROPERTIES; NUMBERS;

D O I：

10.1063/1.4948644

中图分类号：

O3 [力学];

学科分类号：

08 ; 0801 ;

摘要：

The spectra of turbulent heat flux H(k) in Rayleigh-Benard convection with and without uniform rotation are presented. The spectrum H(k) scales with wave number k as similar to k(-2). The scaling exponent is almost independent of the Taylor number Ta and Prandtl number Pr for higher values of the reduced Rayleigh number r (>10(3)). The exponent, however, depends on Ta and Pr for smaller values of r (<10(3)). The probability distribution functions of the local heat fluxes are non-Gaussian and have exponential tails. Published by AIP Publishing.

引用

页数：12