CAJ | 학술논문

通过抛光和氧化刻蚀方法在基体壁面形成微米和纳米尺度的微观结构,然后制备十八烷基硫醇分子自组装膜,从而得到空气中表观接触角为160°的SAM-1表面和空气中表观接触角为116°的SAM-2表面.实验研究了常压条件下两类表面的滴状冷凝传热特性.结果表明两种表面都能够有效提高冷凝传热效果.但是,具有表面纳米结构的SAM-1表面的滴状冷凝传热特性低于SAM-2表面.分析了纳米结构和液固自由能差效应对滴状冷凝传热影响的共同作用机理.
통과포광화양화각식방법재기체벽면형성미미화납미척도적미관결구,연후제비십팔완기류순분자자조장막,종이득도공기중표관접촉각위160°적SAM-1표면화공기중표관접촉각위116°적SAM-2표면.실험연구료상압조건하량류표면적적상냉응전열특성.결과표명량충표면도능구유효제고냉응전열효과.단시,구유표면납미결구적SAM-1표면적적상냉응전열특성저우SAM-2표면.분석료납미결구화액고자유능차효응대적상냉응전열영향적공동작용궤리.
Fine polish and oxidation etching method are applied to prepare micro--and nano--structures on copper surfaces.After that,self-assembled monolayers(SAMs)of n-octadecyl mercaptan are coated on.In air circumstance,the contact angle of water on the nano-structured surface(SAM-1)is 160°and that on the finely polished coated surface fSAM-21 is 116..Both coated surfaces have promoted dropwise condensation very well.The condensation heat transfer performance of the SAM-2 is much better than that of the SAM-1.The coordinated effe!cts of difierence of surface free energy between nanostructure and liquid-solid on the dropwise condensation heat transfer are analyzed.