在kW级PCHE试验测试平台上得到的Nu准则关联式与已有的准则关联式作对比，虽然试验数据与Dittus-Boelter公式提出的Nu数关联式的变化趋势一致，但基于Dittus-Boelter公式提出的Nu数关联式对He-Xe混合工质对流换热的预测是有偏差的，本试验所提出的Nu数准则关联式的值大于相应的Dittus-Boelter公式提出的Nu数关联式的值，这是因为本试验台架的PCHE中的流动状态比Dittus-Boelter公式的几何结构更复杂，通道形状的复杂性可以通过增加通道的表面积和扰动流体流动来提高传热性能，即当流体通过通道时，通道的复杂形状会影响流体的流动方式和速度分布，从而提高传热能力，因此本试验基于试验数据所提出Nu数高于Dittus-Boelter公式提出的Nu数关联式。因此，Dittus-Boelter公式提出的Nu数准则关联式并不适用于以He-Xe混合工质作为工作介质的PCHE的Nu数预测。

The Nu-number criterion correlations obtained on the kW-scale PCHE experimental test rig are compared with the existing criterion correlations, and although the experimental data are consistent with the trend of the Nu-number correlations proposed by the Dittus-Boelter formula, the prediction of convective heat transfer of the He-Xe mixed work masses based on the Nu-number correlations proposed by the Dittus-Boelter formula is biased by the present The value of the Nu number criterion correlation equation proposed by the test is larger than that of the corresponding Nu number correlation equation proposed by the Dittus-Boelter formula, which is due to the fact that the flow state in the PCHE of the present test stand is more complex than the geometry of the Dittus-Boelter formula, and the complexity of the channel shape can improve the heat transfer performance by increasing the surface area of the channel and perturbing the fluid flow,. That is, when the fluid passes through the channel, the complex shape of the channel affects the fluid flow pattern and velocity distribution to improve the heat transfer capability, so the Nu number proposed in this experiment based on the experimental data is higher than the Nu number correlation proposed by the Dittus-Boelter formula. Therefore, the Nu-number criterion correlation proposed by the Dittus-Boelter formula is not applicable to the prediction of the Nu number of the PCHE with the He-Xe mixture as the working medium.