对流换热系数曲线拟合法的原理和应用

曲线拟合法是换热器传热性能实验中经常用到的一种方法，但传统的曲线拟合法存在较多的缺陷。所介绍的曲线拟合法限定条件较少，实用性强。对气体采用温度修正函数时，能够扩大该曲线拟合法适用的温度变化范围。当两侧的流体种类和流体通道相同时，其优点将更加明显。

Principle and application of the curve-fitting method for convective heat transfer coefficient

Curve-fitting methods are frequently used in experiments for heat exchanger performance. However, the curve-fitting methods generally used are inadequate for the data reduction purpose intended. In this paper, a new curve-fitting method is presented, which has relatively fewer restrictions but is more practical. When using the temperature correction function for gases, the temperature variation range, to which the curve-fitting method applies, can be extended. When the fluids and the flow channels on both sides of the heat exchanger are identical, the new method is more advantageous in comparison with the conventional methods.