Abstract A numerical study of condensation heat transfer in curved square and triangle microchannels with various curvatures is conducted. The model is based on the volume of fluid approach and user-defined routines. The predictive accuracy of the numerical results is assessed by comparing the heat transfer coefficient with available correlation. After the validation, the effects of the mass flux and heat flux on heat transfer coefficient are analyzed in detail. Increasing mass flux could strengthen heat transfer performance, while wall heat flux has little effect on condensation heat transfer coefficient. The curved microchannels show an advantage in heat transfer enhancement comparing with the straight ones, and the enhancement performs better in curved microchannels with larger curvatures. Besides, the heat transfer performance could be enhanced in triangle microchannels in comparison with square microchannels.

中文翻译：

---

曲线方形和三角形微通道中冷凝传热的数值研究

摘要 对不同曲率的方形和三角形弯曲微通道中的冷凝传热进行了数值研究。该模型基于流体量方法和用户定义的程序。通过将传热系数与可用相关性进行比较来评估数值结果的预测准确性。验证后，详细分析了质量通量和热通量对传热系数的影响。增加质量通量可以增强传热性能，而壁面热通量对冷凝传热系数影响不大。与直线微通道相比，弯曲微通道在传热增强方面具有优势，并且在曲率较大的弯曲微通道中增强效果更好。除了，