Analytical study on coordinative optimization of convection in tubes with variable heat flux

作     者：YUAN Zhongxian ZHANG Jianguo JIANG Mingjian 

作者机构：College of Environmental and Energy EngineeringBeijing University of TechnologyBeijing 100022China 

出 版 物：《Science China(Technological Sciences)》 (中国科学（技术科学英文版）)

年 卷 期：2004年第47卷第6期

页      面：651-658页

核心收录：

学科分类：08[工学] 0802[工学-机械工程] 

基　　金：National Key Fundamental Research & Development Program, (G20000263) Beijing Municipal Commission of Education 

主　　题：convective heat transfer entrance region field coordination 

摘      要：The laminar heat transfer in the thermal entrance region in round tubes, which has a variable surface heat flux boundary condition, is analytically studied. The results show that the heat transfer coefficient is closely related to the wall temperature gradient along the tube axis. The greater the gradient, the higher the heat transfer rate. Furthermore, the coordination of the velocity and the temperature gradient fields is also analysed under different surface heat fluxes. The validity of the field coordination principle is verified by checking the correlation of heat transfer coefficient and the coordination degree. The results also demonstrate that optimizing the thermal boundary condition is a way to enhance heat transfer.