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首页> 外文期刊>Journal of Heat Transfer >Computational Fluid Dynamics Simulations of Convective Pure Vapor Condensation Inside Vertical Cylindrical Condensers
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Computational Fluid Dynamics Simulations of Convective Pure Vapor Condensation Inside Vertical Cylindrical Condensers

机译：垂直圆筒形冷凝器内对流纯蒸汽冷凝的计算流体动力学模拟

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摘要

This paper presents the results from computational fluid dynamics (CFD) simulations of heat and mass transfer of pure vapor flowing and condensing in a vertical cylindrical condenser system at various inlet temperatures, mass flow rates, and operating pressure for the case where the vapor condensation is not completed inside the condenser tube. The heat and mass transfer inside the condenser tube is simulated as single phase flow, and the thin condensate film on the condensing surface is replaced by a set of boundary conditions that couple the CFD simulations inside the condenser tube and the coolant channel. The CFD results are compared with the experimental results, and good agreement has been found for the various measured temperatures. It is found that both the wall temperature and the heat flux vary significantly along the condenser tube, and it is necessary to consider the conjugate problem that consists of the whole condenser system (condenser plus coolant flow) in predicting the pure vapor condensation in a condensing system. The CFD results show that the heat flux along the condenser tube can be increasing for counter-flow condenser, and the condensate film may not be the main limiting factor in the pure vapor condensation. The results from the CFD simulations also show that the estimation of the interface shear stress cannot be based on the bulk velocity of the water vapor alone.
机译：本文介绍了通过计算流体力学（CFD）模拟得出的结果，该计算结果是在立式圆筒形冷凝器系统中，在不同的入口温度，质量流量和工作压力下，纯蒸汽在冷凝过程中的流动和冷凝的传热和传质模拟。冷凝器管内部未完成。冷凝器管内部的传热和传质被模拟为单相流，冷凝表面上的薄冷凝膜被一组边界条件所代替，该边界条件将冷凝器管和冷却剂通道内部的CFD模拟耦合在一起。将CFD结果与实验结果进行了比较，并且在各种测量温度下都发现了很好的一致性。发现壁温度和热通量都沿着冷凝器管显着变化，在预测冷凝中的纯蒸汽冷凝时，有必要考虑由整个冷凝器系统（冷凝器加冷却剂流量）组成的共轭问题。系统。 CFD结果表明，对于逆流冷凝器，沿着冷凝器管的热通量会增加，并且冷凝膜可能不是纯蒸汽冷凝的主要限制因素。 CFD仿真的结果还表明，界面剪切应力的估计不能仅基于水蒸气的整体速度。

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  • 来源
    《Journal of Heat Transfer》 |2017年第6期|061503.1-061503.11|共11页
  • 作者

    Huali Cao; Jun-De Li;

  • 作者单位

    Institute for Turbulence-Noise-Vibration Interactions and Control, Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen 518055, China;

    College of Engineering and Science, Victoria University, Australia, PO Box 14428, Melbourne MC 8001, Australia;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    film condensation; pure vapor; mass transfer; heat transfer;

    机译：薄膜凝结;纯蒸气传质传播热量;

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