基于非接触测量的圆柱相界面对流传热系数计算方法研究  

CALCULATION METHOD RESEARCH OF CONVECTION HEAT TRANSFER COEFFICIENT IN CYLINDER PHASE CHANGE INTERFACE BASED ON NONCONTACT MEASUREMENT

作　　者：孟凡康[1,2] 于航[1] Meng Fankang Yu Hang(School of Mechanical and Energy Engineering, Tongji University, Shanghai 201804, China School of Architecture Engineering, Liaoning Technical University, Fuxin 123000, China)

机构地区：[1]同济大学机械与能源工程学院,上海201804 [2]辽宁工程技术大学建筑工程学院,阜新123000

出　　处：《太阳能学报》2016年第12期3091-3096,共6页Acta Energiae Solaris Sinica

摘　　要：为发挥非接触测量实验方法在相变对流换热研究中的优点,充分考虑显热传热在整个相变传热中的作用,以长圆柱对流融化过程为研究对象,建立圆柱内部导热控制方程及定解条件,采用三次多项式热平衡积分方法进行近似求解,构建基于非接触测量的圆柱相界面对流换热系数计算方法。建立水流顺掠冰柱实验台,通过对实验例题的分析与讨论得到结论如下:圆柱相界面对流换热系数与相界面位置、圆柱半径融化速率、融化时间、圆柱初始温度及圆柱中心温度等参数有关,该计算方法能够较好的反映出显热变化对于对流换热系数的影响;相界面位置是影响对流换热系数计算准确性的主要因素,提高其测量准确性是减小计算误差的主要努力方向。In order to fully utilize the advantage of noncontact measurement metho I in the study of phase change convective heat transfer, and fully consider the important role of sensible heat transfei in the whole phase change heat transfer process. Taking the convective melting process of a length cylinder as the research object, the governing equation and the solution condition of the internal heat conduction of the cylinder were chosen, the third order polynomial heat balance integral method was used to get the approximate solution, then the calculation method of convection heat transfer coefficient in cylinder phase change interface was established based on noncontact measurement. Besides, an experimental table allowing the water sweep past the ice cylinder was also I uilt. By analyzing and discussing the experimental example, some conclusions could be got as follows： the convection heat transfer coefficient of cylinder phase change interface was related to some parameters, such as the position of phase change interface, the cylinder radius melting rate, the melting time, the initial temperature of cylinder and the temper tlure in cylinder centre, etc. The calculation method can better show the influence of the variation of sensible heat on the convective heat transfer coefficient. The position of the phase change interface is the main factor affecting the cdculation accuracy of convective heat transfer coefficient, improving its measurement accuracy will be the main direction to reduce the calculation error.

关 键 词：圆柱相变材料 非接触测量实验方法 相变过程 对流换热系数 映射关系 

分 类 号：TK02[动力工程及工程热物理]