两侧对流条件下平面冻结凝固相变换热分析  

HEAT TRANSFER ANALYSIS OF PLANE FREEZE PHASE TRANSITION ON DOUBLE-CONVECTION CONDITION

作　　者：张承虎[1] 孙德兴[1] 

机构地区：[1]哈尔滨工业大学市政环境工程学院,哈尔滨150090

出　　处：《太阳能学报》2009年第1期75-80,共6页Acta Energiae Solaris Sinica

基　　金：国家自然科学基金(50578048);北京市"供热;供燃气;通风及空调工程"重点实验室资助项目(KF200710)

摘　　要：通过无因次分析的方法,在相界面两侧均是对流条件下,得到了平面冰层厚度和速度的时变规律、生长条件、极限厚度、温度场分布特点等重要结论,提出了凝固换热全传热系数和衰减特征时间的概念,并给出了理论公式用于换热量计算。结果表明,凝固换热是一个非稳态过程,初始阶段凝固潜热释放强化了换热,衰减特征时间之后,冰层热阻开始恶化换热效果,并最终无限趋近于一稳定状态。On the condition of double convection beside phase interface, using method of similarity theory and dimensional analysis, some important conclusions of plane ice layer were gained, such as time-variation rules of thickness and growth speed, necessary and sufficient condition of growth, limiting thickness, characteristics of temperature filed and soon. Conceptions of total freeze heat-transfer coefficient and attenuation critical time were introduced. The theoretical formulas were given to calculate the quantity of heat transfer. Conclusions indicated that freeze heat transfer is an unsteady process, and heat transfer is enhanced by latent heat release in initial stage, but it would be worsened by thermal resistance of ice after the attenuation critical time. The freeze process would approach a steady stage.

关 键 词：凝固 相变 换热 对流条件 平面 

分 类 号：TU831.6[建筑科学—供热、供燃气、通风及空调工程]