霜层表面部分冰晶升华的实验观测  

OBSERVATION OF SURFACE CRYSTAL SUBLIMATION DURING FROSTING

作　　者：梁展鹏[1] 彭晓峰[1] 李智敏[1] 王补宣[1] 

机构地区：[1]相变与界面传递现象实验室,清华大学,北京100084

出　　处：《工程热物理学报》2009年第2期267-269,共3页Journal of Engineering Thermophysics

基　　金：国家自然科学基金重点项目(No．50636030)

摘　　要：本文通过显微摄像的手段研究霜层表面冰晶形态演化。霜层充分发展后,部分柱状冰晶在周围冰晶正常生长的同时发生升华,并且升华过程从温度较低的根部开始。对于不同的结霜条件,柱状冰晶的升华过程可能以颈部熔断或者顶部融化两种不同方式结束。霜层表面存在复杂的温度和蒸汽浓度分布,局部出现负值的过饱和度是产生这种反常升华现象的主要原因。Morphological variation of surface ice crystals during frosting was visually observed using a microscope. In full growth stage of frost layer, unusual sublimation started from root of a prismy crystal together with growth of other plate crystals nearby. For different environmental conditions, the sublimation could be ended in two ways： snapped at neck or melted in crown. Local minus saturation induced by the coupled distributions of temperature and humidity is proposed for interpreting this phenomenon.

关 键 词：霜 冰晶 升华 

分 类 号：TK124[动力工程及工程热物理—工程热物理]