周期性锯齿型通道内流动和换热研究  

RESEARCH ON THE FLUID FLOW AND HEAT TRANSFER IN A PERIODIC SAW-TOOTH CHANNEL

作　　者：卢玫[1] 杨茉[1] 衣晓青[2] 李凌[1] 董晶瑾[1] 

机构地区：[1]上海理工大学动力工程学院,上海200093 [2]长沙理工大学热能与动力工程学院,湖南长沙410076

出　　处：《工程热物理学报》2006年第6期993-995,共3页Journal of Engineering Thermophysics

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

摘　　要：用非稳态层流模型对锯齿型通道内周期性充分发展流动与换热进行了数值模拟．Re=600时数值结果已发生明显振荡,而从入口段算起的第9、10个几何周期的平均Nu数与用周期性充分发展条件计算得到的平均Nu数吻合良好;在此基础上,计算通道周期长度L与通道垂直高度b的比值及通道倾角α等几何结构尺寸对周期性充分发展流动和换热的影响,计算结果表明,增大α和减小L／b都易促使流动产生涡旋,从而增强换热．A numerical simulation is performed by a unsteady laminar model for the periodically fully developed fluid flow and heat transfer in a saw-tooth channel. An oscillatory solution can be obtained when the Reynolds number is equal to 600. The numerical results show that the average Nusselt numbers at the 9th and 10th geometries cycles from the inlet are in agreement with those computed by the periodic conditions, and fluid flow and heat transfer are impacted by geometrical structure size such as the ratio of period length L to channel height b and channel angle α. When channel angle a increases and the ratio L/b decreases, the heat transfer can be enhanced.

关 键 词：周期性通道 对流换热 数值模拟 

分 类 号：TK124[动力工程及工程热物理—工程热物理]