化工学报2016，Vol.67Issue(9)：3552-3558,7.DOI:10.11949/j.issn.0438-1157.20160292
辐射吊顶表面冷凝液滴脱落尺寸分析
Size of departing condensate droplets from radiant cooling ceiling
摘要
Abstract
The size of condensate droplets departing from horizontal superhydrophobic copper surfaces and conventional aluminum alloy surfaces was studied experimentally and theoretically. During the whole condensation experiment, the dew formation and departure underneath the sample surfaces were imaged by CCD. It was found that the radius of the condensate droplets of the coalescence-induced jumping condensate departed from the superhydrophobic surface was below 300μm. The coalesced droplets merged by micro-droplets with a radius ratio ranging from 1.0 to 1.5 were subject to self-removal from the superhydrophobic surface. This was because the driving force of the released surface energy after droplet coalescence became dominant compared to the resistance of the work of adhesion and viscous dissipation with the decrease of the radius ratio. In addition, the radii of the gravity-induced falling droplet from conventional aluminum alloy surfaces were ranged from 2.0 mm to 6.0 mm, and limited by the advancing and receding contact angles. Therefore, these results revealed that the superhydrophobic surface can significantly decrease the size of droplets departing from radiant ceiling panels and reduce condensation risks of radiant cooling ceiling systems.关键词
凝结/超疏水表面/接触角/热力学/数值模拟Key words
condensation/superhydrophobic surface/contact angle/thermodynamics/numerical simulation分类
能源科技引用本文复制引用
唐海达,张涛,刘晓华,江亿..辐射吊顶表面冷凝液滴脱落尺寸分析[J].化工学报,2016,67(9):3552-3558,7.基金项目
国家科技支撑计划项目（2014BAJ02B01）；广东省科技计划项目（2013A090100016）。@@@@supported by the National Key Technology Support Program (2014BAJ02B01) and the Science and Technology Planning Project of Guangdong Province(2013A090100016) （2014BAJ02B01）
