管内变密度流体的充分发展流动与换热  

FULLY DEVELOPED FLOW AND HEAT TRANSFER OF VARIABLE DENSITY FLUID IN TUBE

作　　者：杨茉[1] 侯野[1] 卢玫[1] 李凌[1] 张建生[2] 朱惠中[2] 

机构地区：[1]上海理工大学动力工程学院,上海200093 [2]宝山钢铁股份有限公司能源部,上海201900

出　　处：《工程热物理学报》2007年第4期670-672,共3页Journal of Engineering Thermophysics

基　　金：国家自然科学基金(No.50476080);上海市教委发展基金项目资助(No.05EZ17)

摘　　要：本文提出了圆管内变密度流体流动与换热充分发展的概念及其相关假设。在所提出的概念和假设基础上给出了摩擦阻力系数C_f与Nusselt数Nu的定义式和计算式。通过对圆管内密度随温度变化的氩气的流动与换热所进行的数值模拟,验证了在本文的计算条件范围内,圆管内变密度流体充分发展流动与换热的概念是合理的,并且C_fRe=16, Nu=4．36。The concept and its related assumptions of fully developed fluid flow and heat transfer in tube considering variable density are presented in this paper. The definitions and derivations of Cf and Nu, which represent friction factor and Nusselt number respectively, are given on the basis of the concept and assumptions above. The numerical simulation of Argon flow and heat transfer considering density variation with temperature in tube is performed, which proves that the fully developed concept of variable density fluid flow and heat transfer in tube is reasonable in the range of calculation parameters in this paper. The calculation shows that CfRe is 16, and Nu is 4.36.

关 键 词：充分发展的流动与换热 变密度 圆管 

分 类 号：TK124[动力工程及工程热物理—工程热物理]