东南大学学报（自然科学版）2017，Vol.47Issue(1)：79-84,6.DOI:10.3969/j.issn.1001-0505.2017.01.015
冷表面霜晶演化的微观可视化观测
Visualization observation of frost crystal evolution on cold surface
摘要
Abstract
Microscopic visualization of frost layer growth process on cold surface was conducted and frost crystal evolution characteristics in different frost growth periods were observed.In addition,the initial droplet nucleation process on the cold surface was analyzed based on the theory of phase trans-formation kinetics.The experimental results show that the frost crystals at different positions of the cold surface grow unevenly during the frost layer growth stage and frost branch fracture and frost crystal melting phenomena can be locally seen.It is also found that the frost crystal at different posi-tions gradually tends to be uniform with the time evolution.The study results indicate that the phase transformation driving force increases with the increase of the water vapor supersaturation degree of moist air,thus leading to the increase of the possibility of vapour-liquid phase change and the acti-vate liquid core formation on the surface with lower temperatures.The combined effect on the frost crystal surface temperature and the local water vapor partial pressure is an important reason for the frost crystal melting.关键词
霜晶演化/微观可视化/相变驱动力/霜晶消融/霜枝倒伏Key words
frost crystal growth/microscopic visualization/phase transformation driving force/frost crystal melting/frost branch fracture分类
能源科技引用本文复制引用
李栋,陈振乾,王鑫,赵孝保..冷表面霜晶演化的微观可视化观测[J].东南大学学报（自然科学版）,2017,47(1):79-84,6.基金项目
江苏省自然科学基金青年基金资助项目（BK20150979）、江苏省高校自然科学研究资助项目（15KJB470009）、南京师范大学高层次人才科研启动基金资助项目（2015112XGQ0102）． （）
