Condensation heat transfer in steam pipes is a common phenomenon in industrial prod-ucts.Study on the influence of different pipeline conditions on condensation heat transfer and gas-liquid distribution characteristics is of reference value for steam pipelines design and optimiza-tion.In this paper,the VOF multiphase flow model is used to simulate and analyze the flow and heat loss in the steam pipe.The paper mainly compares the influence of different pipe wall thicknesses as well as inner diameters on the heat transfer characteristics and gas-liquid behavior,and analyze the secondary flow phenomenon at the 90° corner near the outlet.The research results show that the increase of the pipe wall thickness and the inner diameter reduction of the pipe will increase the heat flow per unit area of the pipe wall,and the increase in pipe wall thickness and inner diameter causes the wall surface area to increase and the total heat loss to increase.The Dean vortex formed after passing through the 90° corner has a direct effect on the gas-liquid distribution in the pipeline.
vapor condensationgas-liquid flowsecondary flowheat transfer
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