一、引言 在前一篇文章里,我们叙述了一侧流体混合一侧流体不混合的叉流换热器的平均温差修正系数F的实验测量结果。考虑到管内外流体特别是管外流体的传热系数不易算准,这种不准确性对F有直接影响,作者认为有必要从另一个角度对叉流换热器的平均温差作进一步的研究,即测量管外空气垂直于流动方向的温度分布,并将测量结果同按改进的数学模型计算的结果进行比较,从而进一步判断管外流体中混合作用的大小。比较表明, I. INTRODUCTION In the previous article, we described the experimental measurements of the average temperature correction coefficient F for a fluid-miscible cross-flow heat exchanger on one side of a fluid. Considering that the heat transfer coefficient of fluid inside and outside the pipe, especially the fluid outside the pipe, is not easily calculated, this inaccuracy has a direct influence on F, and the author thinks it is necessary to further study the average temperature difference of the cross-flow heat exchanger from another angle , That is measured outside the pipe perpendicular to the flow direction of the air temperature distribution and measurement results with the improved mathematical model to compare the results to further determine the size of the mixing tube outside the fluid. Comparison shows that,