非均匀过热面沸腾换热关系

Boiling heat transfer on a non-uniformly heated surface

针对工业中广泛使用的沸腾换热结构提出了利用实验测定非等温面沸腾换热关系的两种实验分析方法。一种是测定换热边界上的温度分布，通过求解温度场的边值问题，确定其换热关系。另一种是，如果实际换热单元较细长而对称，则测定对称轴线上或换热侧面上的温度分布，即可得到温度场和换热关系。文中利用第二种方法分析了现有的实验结果，确立了非等温表面沸腾换热关系，发现该换热关系曲线与“拔山”曲线有着重要差别，文中还就这种差别进行了讨论。

Two analytical methods to determine the boiling heat transfer relationship on a non-uniformly heated surface are proposed,which are based on the experiments with widelyused vapour-cooled structures. After the temperature distributions on the heat transfer boundary surface are measured, the relationship can be determined by use of solving the boundary value problem for the temperature. If the unit of the structure is slender and symmetrical about the central line, the relationship can also be determined by means of measuring the temperature distribution along the central line or on the heat transfer surface.Based on the second method,the existing experimental data is analyzed and the relationships are determined. The significant difference between the heat tranfer relationships on an isotemperature surface and on the surface with non-uniform temperature. was found.