Journal of Shandong University(Engineering Science) ›› 2020, Vol. 50 ›› Issue (6): 129-134.doi: 10.6040/j.issn.1672-3961.0.2020.295

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Condensation heat transfer characteristics of steam containing non-condensable gas on sawtooth surface

YAN Jiqing1, WANG Xiaojia2, TIAN Maocheng2   

  1. 1. Shenhua Engineering Technology Co., Ltd., Beijing 100007, China;
    2. School of Energy and Power Engineering, Shandong University, Jinan 250061, Shandong, China
  • Published:2020-12-15

Abstract: To obtain higher thermal efficiency in the condensation process of steam containing non-condensing gas, a new sawtooth heat transfer strengthening plate was proposed and its two-dimensional model was established. The difference of condensation heat transfer characteristics between serrated plate and corrugated plate with the same specification was analyzed by Fluent software. A condensation heat transfer model to calculate both non-condensable gas layer and liquid film layer at the same time was established and compiled by user defined functions in the numerical simulation. The model reliability was verified by comparing with the experimental values in the same working conditions. The two-phase flow and heat and mass transfer characteristics of different plate surfaces are obtained, and the results showed that compared with the corrugated plate, the sawtooth plate could significantly improve the turbulence of the non-condensable gas layer, which was beneficial to the heat and mass transfer process on the liquid film surface. The liquid film of the sawtooth plate would be periodically fractured at the tooth peak of the wave node and then re-formed on the downstream wall surface and reached the maximum thickness at the trough. Compared with the corrugated plate, the heat transfer capacity of the sawtooth plate was improved by more than 60%.

Key words: sawtooth plate, numerical calculation, condensation heat transfer, non-condensable gas, liquid film

CLC Number: 

  • TK124
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