Two-phase How-boiling of Refrigerant-based Nanofluid in a Horizontal Tube
Experiments have been conducted in a conventional two-phase pass-through test section to measure the evaporative heat transfer coefficient of R134a with and without silica nanopartieles. For nanoparticle volume fractions of 0.5％ and 0.05％, the heat transfer coefficient decreased in comparison to pure R134a. Systematic dispersion experiments in a test tube indicate that particles with a hydrophobic surface coating are most promising for refrigerant-based nanofluids. Adding a small fraction of compressor oils had an insignificant effect on particle dispersion in refrigerants.The possible causes of the boiling heat transfer degradation are formation of nanoparticle film on boiling surface,increased viscosity,and moderate quality of particle dispersion.
Park Y Liu L P Andrew D Sommers Anthony M Jacobi
Department of Mechanical Science and Engineering,University of Illinois at Urbana-Champaign,Urbana IL 61801,USA
国际会议
上海
英文
954-963
2008-04-05（万方平台首次上网日期，不代表论文的发表时间）