Unprecedented heat dissipation requirements drive investigation and further enhancement of condensation heat transfer inside small channels significant. Converging-shaped small-sized channel is coined，and its annular condensation performance is studied analytically in this work. The influence of channel size and gravity are considered to better fulfill heat dissipation goals under varying-gravity conditions. The analytical results accord with predictions of the Comprehensive Shah Correlation satisfactorily. The nondimensional correlation for condensation heat transfer performance is derived. Channel with smaller radius ensures better condensation performance when channel cross-sectional area remains constant, which is more pronounced for small-gravity conditions. Converging channel enhances the local condensation performance after channel central cross section and the overall condensation performance even with very small converging angles. As channel size and gravity decrease, converging channel performs even better.

前所未有的散热要求推动了研究的发展，并进一步增强了小通道内冷凝水的热传递。提出了会聚形的小通道，并通过分析研究了其环形凝结性能。通道大小和重力的影响被认为可以更好地实现在不同重力条件下的散热目标。分析结果令人满意地符合综合Shah相关性的预测。导出了冷凝传热性能的无量纲相关性。当通道横截面积保持恒定时，半径较小的通道可确保更好的冷凝性能，这在小重力条件下更为明显。即使在非常小的会聚角的情况下，会聚通道也可提高通道中心横截面后的局部冷凝性能，并提高整体冷凝性能。随着通道尺寸和重力的减小，会聚通道的性能会更好。