In this paper, the condensation heat transfer characteristics of light tubes and spiral tube tubes are studied by numerical analysis. The condensation characteristics of vertical spiral tube containing non-condensing gas vapor were explored, and the distribution of steam velocity, pressure and temperature near the wall of the heat transfer tube was analyzed. The enhanced heat transfer method of non-condensing gas vapor was obtained, which provided a theoretical basis for the enhanced heat transfer of steam condensation. The results show that the spiral tube can increase the heat exchange performance. The spiral can effectively reduce the thickness of the liquid film, which can impressively enhance the heat transfer performance.

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