摘要
为分析套管内海水流动的对流换热特性,搭建了套管内海水流动的实验台,通过实验数据确定了套管内海水温度分布,并得出实验范围内的换热准则关联式,并对拟合换热关联式的误差进行了分析。结果表明:套管内海水对流换热的强弱主要由换热装置尺寸、海水物性以及紊流热扩散系数决定;实验数据拟合得出,在热流密度为1.66×10~4～6.6×10~4 W/m^2、雷诺数为4 837～16 068时,恒热流条件下套管内海水换热准则关联式为Nu=0.015Re^(0.645)Pr^(0.39);拟合换热关联式的误差分析发现,主要工况的Nu实验值与拟合关联式的Nu数值误差范围在±20%以内。
In order to solve the problem of convective heat transfer characteristics of seawater flow in the casing,the distribution of seawater temperature field in the casing and the correlation of heat transfer criteria are theoretically deduced by setting up an experimental platform for seawater flow in the casing.The distribution of seawater temperature in the casing is determined by the experimental data,and the correlation formula of heat transfer criterion in the experimental range is obtained,and the error of the fitted heat transfer correlation is analyzed.The result shows that the convective heat transfer of the seawater in the casing is mainly determined by three factors,including the size of the heat exchanger,the physical properties of seawater and the turbulent thermal diffusivity.When the heat flux is 1.66×104~6.6×104 W/m2 and the Reynolds number is 4 837~16 068,the experimental data shows that the correlation formula of heat transfer criterion is Nu=0.015Re0.645Pr0.39 under constant heat flux.The error analysis of the fitted heat transfer correlation shows that the error range of experimental Nu and Nu of the fitted correlation in the main operating conditions are within ±20%.
作者
杨丁丁
柳建华
徐小进
张良
YANG Ding-ding;LIU Jian-hua;XU Xiao-jin;ZHANG Liang(School of Energy and Power Engineering,University of Shanghai for Science and Technology,Shanghai,China,Post Code:200093;No.704 Research Institute of CSIC,Shanghai,China,Post Code:200031)
出处
《热能动力工程》
CAS
CSCD
北大核心
2019年第3期85-91,共7页
Journal of Engineering for Thermal Energy and Power
基金
上海市部分地方院校能力建设专项计划(16060502600)~~
关键词
对流换热
海水
关联式
温度场
convective heat transfer
seawater
correlation formula
temperature field
