基于毛细润湿机理的PVDF中空纤维换热毛细管制备及其性能研究  

The preparation and performance of PVDF hollow fiber heat capillary based on capillary wetting mechanism

作　　者：于杰[1] 陈华艳[1] 高启君[1] 王攀[1] 贾悦[1] 王暄[1] 武春瑞[1] 吕晓龙[1] 

机构地区：[1]天津工业大学生物化工研究所省部共建分离膜与膜过程国家重点实验室,天津300387

出　　处：《功能材料》2016年第10期10091-10095,共5页Journal of Functional Materials

基　　金：国家自然科学基金青年科学基金资助项目(21306135);国家自然科学基金资助项目(51278336;51578376)

摘　　要：针对高分子材料的换热器普遍存在传热系数低的问题,提出了基于毛细润湿机理的PVDF中空纤维换热毛细管。首先采用非溶剂致相分离法制备具有多孔结构的PVDF中空纤维换热毛细管,利用换热毛细管壁中的非贯通孔在换热过程中,空气隙被水填充后,微孔中的水分受传热过程中管壁两侧温差而产生微循环,可增强传热从而提高传热系数,还对换热毛细管的力学性能、孔隙率、表面结构、断面结构等方面进行表征,揭示换热管表面微孔对传热的促进机理。亲水化改性后的总传热系数比改性前可提升104%。The heat exchangers of polymer material have the problem of low thermal conductivity.This paper proposes PVDF heat exchange capillary tubes based on capillary wetting mechanism.Namely PVDF heat ex-change capillary tubes with porous structure were prepared by nonsolvent induce phase separation,the heat transfer process was intensified by wetting the air gap of the capillary surface,and their mechanical perform-ance,internal porosity and structure were characterized.It is shown that heat transfer has been promoted by the air gap of the capillary surface.However,thermal transmission is hindered by the air gap of the capillary surface for the low conductivity of air.The air gap of the micropores in the tube wall would be filled up with water after the micropores of the tubes wall being hydrophilized which means that water in the micropores would form mi-cro-convection by the temperature difference between two sides of the tube wall.Thus the heat transfer coeffi-cient could be significantly improved.The total heat transfer coefficient of hollow fiber heat exchanger can be improved of 104% after being hydrophilized.

关 键 词：非溶剂致相分离法 换热毛细管 聚偏氟乙烯 传热系数 

分 类 号：TQ028[化学工程]