کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7054241 1458016 2018 13 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Determination of condensation heat transfer inside a horizontal smooth tube
ترجمه فارسی عنوان
تعیین انتقال گرمایی درون یک لوله صاف افقی
کلمات کلیدی
جریان دو مرحله ای، مدل اویلر-اویلر، تراکم جریان، رژیم جریان تنگه دار و حلقوی، ضریب انتقال حرارت، لوله صاف افقی کسر سطح چگالی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
چکیده انگلیسی
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/m2 s, with a nominal saturation temperature of 40 °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.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Heat and Mass Transfer - Volume 124, September 2018, Pages 816-828
نویسندگان
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