Abstract
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.
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