摘要
结霜工况下,换热器翅片表面结霜会增大换热热阻,堵塞空气流道。在低温高湿条件下对波纹表面的结霜过程进行了实验研究,分析了冷面温度、湿空气流速及波纹结构等因素对波纹表面冷凝水珠冻结和霜层生长的影响。结果表明:冷面温度越低,冻结的冷凝水珠越小,冻结时间也越短;冷面温度越低或湿空气流速越快,霜层生长越快;在相同的实验条件下,波纹表面上霜层的高度比平直表面的低。
For heat exchangers operating with low air temperature and high humidity,frost appears on the fin surfaces,which increases the thermal resistance and blocks the air channels.Frosting process on a wavy plate was experimentally investigated.This study focuses on several factors affecting the condensate water droplets freezing process and frost layer growth process,i.e.the cooling surface temperature,the air velocity and the plate structure.The results show that the condensate droplets are smaller and freeze earlier with lower cooling surface temperature.The frost layer grows faster with lower cooling surface temperature and higher air velocity.Compared with flat plates,frost height growth on wavy plates is much slower.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2017年第S1期191-195,共5页
CIESC Journal
基金
教育部高等学校博士学科点专项科研基金项目(20130002110073)
清华大学自主科研计划项目(20131089319)~~
关键词
相变
表面
传热
结霜
水珠冻结
霜层高度
phase change
surface
heat transfer
frosting
water droplet freezing
frost height
