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首页> 外文期刊>International Journal of Heat and Mass Transfer >Determination of condensation heat transfer inside a horizontal smooth tube
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Determination of condensation heat transfer inside a horizontal smooth tube

机译：水平光滑管内冷凝热传递的测定

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摘要

A mathematical model has been developed with the open source toolbox OpenFOAM to simulate the heat transfer process during flow condensation inside a smooth horizontal tube. The proposed model borrows some of the ideas of a recent boiling model, already developed in OpenFOAM 4.0. Modifications have been brought to this model to take into account the specific nature of flow condensation. A new coefficient called the "condensation area fraction" is introduced and a new library is added to the solver to simulate the wall heat flux during the condensation process. In order to assess the performance of the new model, numerical simulations are conducted for mass fluxes ranging from 100 to 750 kg/m(2) s, with a nominal saturation temperature of 40 degrees C and a hydraulic diameter between 7 and 12 mm. The numerical predictions are compared to the results of two experimental works and good agreement has been found between measurements and model's predictions. It shows the validity of the suggested numerical solution for modeling of flow condensation inside of a horizontal smooth tube. Moreover, the effect of some parameters such as mass flux, tube hydraulic diameter, vapor quality and difference between the wall and saturation temperature on the heat transfer coefficient are investigated. Finally, a new relationship for the prediction of the total heat transfer coefficient of flow condensation is proposed. (C) 2018 Elsevier Ltd. All rights reserved.
机译：已使用开源工具箱OpenFOAM开发了数学模型，以模拟光滑水平管内的流动冷凝过程中的传热过程。提议的模型借鉴了OpenFOAM 4.0中已经开发的最新沸腾模型的一些思想。考虑到流动冷凝的特殊性质，对该模型进行了修改。引入了一个称为“冷凝面积分数”的新系数，并向求解器添加了一个新库来模拟冷凝过程中的壁热通量。为了评估新模型的性能，对质量通量从100到750 kg / m（2）s进行了数值模拟，标称饱和温度为40摄氏度，水力直径为7到12毫米。将数值预测与两个实验工作的结果进行比较，并且在测量值与模型预测之间找到了很好的一致性。它显示了建议的数值解法对水平光滑管内流动冷凝建模的有效性。此外，研究了诸如通量，管子水力直径，蒸汽质量以及壁和饱和温度之间的差异等参数对传热系数的影响。最后，提出了一种新的关系式，用于预测流动冷凝的总传热系数。 （C）2018 Elsevier Ltd.保留所有权利。

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