Numerical Investigation on Condensation of Non-Condensable Gas in Large Deformation Enhanced Tube

In order to improve the condensation heat transfer performance of tubelines in cooling systems, a new type of large deformation heat transfer tube was proposed. Based on the theory of diffusion, the distributions of temperature, velocity, heat transfer coefficient, and species are presented to compare with smooth tubes. In addition, the effects of relevant parameters on thermo-hydraulic performance are discussed. The numerical results show that the distributions of temperature and velocity show a periodic distribution. The unique structure of the large deformation heat transfer tube disturbs the fluid flow near the wall. The boundary layer of air concentration is destroyed, resulting in heat transfer enhancement. Within the scope of this paper, the heat transfer coefficient and friction factor of the large deformation heat transfer tube are increased by 1.01–3.47 times and 1.05–7.13 times compared with the smooth tube. The heat transfer performance increases with the rising dimple depth and declining noncondensable gas content and dimple pitch.OPEN ACCESS Received: 25/06/2025 Accepted: 29/07/2025 Published: 23/01/2026