超临界压力下纳米流体竖直管内流动换热  

Convection heat transfer of Fe_3O_4-kerosene in a vertical tube at supercritical pressures

作　　者：张巍[1] 黄丹[2] 吴晓雨[2] 宋亚超[2] 陈松泽[2] 李蔚[3] 朱海涛[4] 

机构地区：[1]核动力运行研究所,湖北武汉430223 [2]浙江大学能源工程学系先进航空发动机协同创新中心,浙江杭州310027 [3]浙江大学能源工程学系,浙江杭州310027 [4]青岛科技大学材料工程学系,山东青岛266402

出　　处：《化工学报》2015年第4期1265-1271,共7页CIESC Journal

基　　金：国家自然科学基金项目(51172117);浙江省自然科学基金项目(Z13E060001);国家支撑计划项目(2012BAA10B01)~~

摘　　要：对超临界压力下Fe3O4-煤油纳米流体竖直管内的换热特性进行了实验研究,分析了不同压力、质量流量、热通量和纳米颗粒浓度对超临界压力下纳米流体换热特性的影响。超临界压力下,纳米流体在竖直管内沿管长呈现不同的换热规律。流体质量流量的提高或者工作压力的提高均会使纳米流体在竖直管内流动换热效果变好。而热通量的增大或纳米颗粒的添加对超临界压力下纳米流体的换热具有恶化效果。最后给出了纳米流体在超临界压力下的传热关联式,其计算值和实验值吻合良好。An experiment on the heat transfer characteristics of Fe3O4-kerosene flowing in a vertical upward tube at supercritical pressure was conducted. In the experiments, the effects of such factors as mass flux, heat flux, pressure and particle content were investigated. There were different heat transfer mechanisms along the tube. Increasing flow rate or working pressure could enhance heat transfer performance, but higher heat flux led to poorer heat transfer performance. Besides, addition of solid particles deteriorated heat transfer performance through modification of inner wall surface. Based on the experimental data, a correlation for predicting heat transfer of Fe3O4-kerosene at supercritical pressure was established and showed good agreement with experimental data.

关 键 词：超临界流体 Fe3O4-煤油 纳米颗粒 换热特性 传热关联式 

分 类 号：TK16[动力工程及工程热物理—热能工程]