EXPERIMENT STUDY ON INITIAL STAGES OF FROST GROWTH ON DIFFERENT CHARACTER SURFACE
The surface energy influence to phase change of water vapor at initial stages of frost growth was studied to find an effective method .The mechanism of restraining frost growth by low energy surface (bigger contact angle) was analyzed by crystal growth theory, then water vapor phase change at different energy surface was observed by microscope. The result indicates that it is difficult for low energy surface to form critical embryo; it can restrain frost growth in a way. Then the process of frost growth on different surface was observed by microscope. The result indicates that both surface experience water formation-droplet growth -ice formation- dendritic ice growth progress. But the ice bead on hydrophobic surface form later than that on hydrophilic surface, and have larger average diameter and sparse distribution, the dendritic ice also appear later. All of this support that low energy surface can retard ice crystal formation at initial stage of frost growth and dendritic crystal growth, using low energy surface to restrain frost growth is a valuable method.
restrain frost growth surface character contact angle
liang CAI Puxiu HOU Weiping YU
School of Energy and Environment, Southeast University, Nanjing, Jiangsu,210096
国际会议
The 22nd International Congress of Refrigeration(第22届国际制冷大会)
北京
英文
2007-08-21（万方平台首次上网日期，不代表论文的发表时间）