INTERMITTENCY AND SCALING IN TURBULENT CONVECTION

作     者：EmilyS.C.CHING 

作者机构：DepartmentofPhysicsTheChineseUniversityofHongKongHongKongChina 

出 版 物：《Acta Mechanica Sinica》 (力学学报（英文版）)

年 卷 期：2003年第19卷第5期

页      面：385-393页

核心收录：

学科分类：080704[工学-流体机械及工程] 080103[工学-流体力学] 08[工学] 0807[工学-动力工程及工程热物理] 0801[工学-力学（可授工学、理学学位）] 

基　　金：香港研究资助局资助项目 

主　　题：turbulent convection intermittency scaling 

摘      要：Both the velocity and temperature measurements taken in turbulent Rayleigh-B enard convection experiments have been analyzed. It is found that both the velocity and temperature fluctuations are intermittent and can be well-described by the She-Leveque hierarchical structure. A positive correlation between the vertical velocity and the temperature differences is found both at the center, near the sidewall and near the bottom of the convection cell, supporting that buoyancy is significant in the Bolgiano regime. Moreover, the intermittent nature of the temperature fluctuations in the Bolgiano regime can be attributted to the variations in the temperature dissipation rate. However, the relations between the velocity and temperature structure functions and their correlations implied by the Bolgiano-Obukhov scaling are not supported by experimental measurements.