摘要
在中等雷诺数(3000~7000)下的广泛温度范围内(300~700℃)水测量了水蒸汽和干空气的混合介质(rH2O= 0.25~ 0.45)横流单管和管排的对流换热系数,并与经典的Zhukauskas方法计算结果进行了比较,实验结果表明,高水分烟气横流圆管对流换热系数伴随烟气水分浓度的增大和温度的升高而加强,这种加强的趋势比使用Zhukauskas关联式计算得到的结果更为显著,本文使用烟气水分含量作为修正因子,通过修正的Zhukauskas关联式,给出了高水分烟气横流圆管对流换热计算关联式。
The heat transfer coefficient is measured for crossflow of a mixture of air and Vapor over a cylinder at medium Reynolds numbers (3000 - 7000) for temperatures between 300 to 700℃ and for humidity ratios of 0.25 - 0.45. Results are also presented for a set of three cylinders aligned perpendicular to the flow. The effect of the vapor concentration and temperature on the convection coefficients is investigated to develop a modified Zhukauskas correlation. The results show that the heat transfer coefficient in...
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2001年第S1期93-96,共4页
Journal of Engineering Thermophysics
关键词
高水分
横流
对流换热
high moisture content
crossflow
convection coefficients