摘要
为了减弱高浓度相变微胶囊悬浮液出现的导热系数低和黏度大等传热不利因素的影响,开展了相变微胶囊悬浮液在螺旋波纹管内层流流动换热的数值研究,结果表明:管道入口速度增加时,螺旋波纹管内相变微胶囊悬浮液的相变区范围增幅小于光管;和常规流体水相比,质量分数为5%~20%的相变微胶囊悬浮液的沿程局部修正努塞尔数平均增加0.4倍~3.5倍,悬浮液增强管道换热效果明显;质量分数为10%的相变微胶囊悬浮液和水相比,光管平均修正努塞尔数增加40%,螺旋波纹管平均增加了60%,螺旋波纹管凹槽对流体的扰动使相变微胶囊悬浮液强化换热优势更明显.
The microencapsulated phase change material slurries(MPCMS)with high concentration have lower thermal conductivity and higher viscosity.In order to reduce the effect of these unfavorable factors on heat transfer,the numerical study of laminar convection heat transfer for MPCMS in helically corrugated tube was conducted.The results show that the increasing range of phase change zone of MPCMS in helically corrugated tube is less than that in the smooth tube when the inlet velocity of fluid increases.Compared with the conventional water,the corrected local Nusselt numbers along the tube wall for 5%~20%MPCMS increase by 0.4~3.5 times respectively,and MPCMS enhances the heat convec⁃tion prominently.In the smooth tube,the corrected average Nusselt number of 10%MPCMS is 40%higher than that of water,and the value is 60%in the helically corrugated tube.Owing to the fluid disturbance by the helically corrugated tube,the advantage of MPCMS enhancing the heat transfer is more obvious.
作者
崔志强
田丽亭
岳小棚
张宇
CUI Zhiqiang;TIAN Liting;YUE Xiaopeng;ZHANG Yu(School of Energy and Environmental Engineering,Hebei University of Technology,Tianjin 300401,China;Cangzhou Hegong Science Park Construction&Investment Co Ltd,Cangzhou,Hebei 061000,China)
出处
《河北工业大学学报》
CAS
2020年第1期58-63,90,共7页
Journal of Hebei University of Technology
基金
国家自然科学基金(51576059)
河北省自然科学基金(E2019202184)
沧州高新区博士后工作经费资助项目
关键词
微胶囊悬浮液
螺旋波纹管
层流
相变换热
数值模拟
microencapsulated slurry
helically corrugated tube
laminar flow
phase-change heat transfer
numerical simulation
