Diverging-shaped small channel is considered analytically aiming to further enhance condensation heat transfer inside channels. To fulfill heat dissipation requirements under varying-gravity conditions, effectiveness of the diverging small channel is also verified under different gravities. The refrigerant mass flow rate, total heat transfer area and thermal boundary conditions are fixed to investigate effect of channel shape. Smaller channel possesses better overall condensation performance, especially for small-gravity conditions. Diverging channel enhances local condensation heat transfer even with very small diverging angles. Overall condensation heat transfer becomes worse as diverging angle is relatively larger when channel size and gravity decrease. Converging-shaped small channel is therefore proposed and verified to effectively enhance the overall condensation heat transfer performance.

中文翻译：

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不同重力条件下强化冷凝传热的分流/合流小通道


分析认为发散形小通道旨在进一步增强通道内的冷凝传热。为了满足变重力条件下的散热要求，还验证了分流小通道在不同重力下的有效性。固定制冷剂质量流量、总传热面积和热边界条件来研究通道形状的影响。较小的通道具有更好的整体冷凝性能，尤其是在小重力条件下。即使发散角非常小，发散通道也能增强局部冷凝传热。当通道尺寸和重力减小时，随着发散角相对较大，整体冷凝传热变得更差。因此提出并验证了收敛形小通道可以有效增强整体冷凝传热性能。