剪切稀化流体中气泡界面污染对传热的影响  

Effect of Bubble Interface Contamination on Heat Transfer in Shear-Thinning Fluid

作　　者：王俊[1] 庞明军[1] WANG Jun;PANG Mingjun(School of Mechanical Engineering and Rail Transit,Changzhou University,Changzhou 213164,China)

机构地区：[1]常州大学机械与轨道交通学院,江苏常州213164

出　　处：《常州大学学报（自然科学版）》2022年第6期41-53,共13页Journal of Changzhou University：Natural Science Edition

基　　金：国家自然科学基金资助项目(51376026);2021年度常州大学创新创业基金资助项目(2021-A-06)。

摘　　要：采用停滞帽模型,对剪切稀化流体中表面受污染气泡的传热特性进行了详细研究。结果表明流变指数对气泡传热效率的影响相对较小,而雷诺数和气泡界面污染程度对气泡传热效率影响较大;随着雷诺数的增大和(或)停滞帽角度的减小,气泡周围热边界层逐渐变薄,传热效果变好;且界面受污染气泡表面的平均努塞尔数随着停滞帽角度的减小和(或)雷诺数的增大而增大。The stagnation cap model is used to study the heat transfer characteristics of contaminated bubbles in shear-thinning fluids.The results show that the effect of rheological index on the bubble heat transfer is relatively small but the Reynolds number and the contamination degree of bubble interface has the great influence on it;with the increase of Reynolds number and/or the decrease of stagnation cap angle,the thermal boundary layer around the bubble becomes thinner and the heat transfer becomes good;and the average Nusselt number increases with the decrease of stagnation cap angle and the increase of the Reynolds number.

关 键 词：剪切稀化流体 界面污染 传热 停滞帽模型 泡状流 

分 类 号：TK124[动力工程及工程热物理—工程热物理]