对于 PCHE (通道直径, 通道倾斜角, 流向节距) 来说，单板相邻通道之间的距离a和冷板与热板之间的距离t只影响其稳健性，而它们对热液性能的影响可以忽略。因此，在分析不同通道直径下的 PCHE 性能时，单板相邻通道之间的距离和冷板与热板之间的距离保持不变。在相同的通道直径下，努塞尔特数和压降随着质量流量的增加而增大。这表明，增加质量流量可以提高热交换效率，但流体与通道接触的频率会增加，从而增加流动阻力。在质量流量不变的情况下，努塞尔特数和压降随着通道直径的减小而增大。

For a PCHE, the distance a between the adjacent channels of the single plate and the distance t between the cold plate and the hot plate only affect its robustness, while their influences on the thermal-hydraulic performance can be neglected. Therefore, for the analysis of PCHE performance with different channel diameters in this work, a and t are kept constant. The variation of the Nusselt number and pressure drop for different channel diameters and mass flow rates is analyzed. The Nusselt number and pressure drop enlarge with mass flow for the same channel diameter. It demonstrates that an increase in mass flow rate can improve heat exchange effectiveness, while the contact frequency of fluid-to-channel increases, which increases the flow resistance. Besides, for a constant mass flow rate, the Nusselt number and pressure drop enlarge as the channel diameter decreases.