کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7054507 | 1458019 | 2018 | 12 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
A combined CFD/visualization investigation of heat transfer behaviors during geyser boiling in two-phase closed thermosyphon
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
In order to promote the understanding of geyser boiling in two-phase closed thermosyphon, a combined CFD/visualization investigation was carried out in this work. The widely used phase change model, i.e., Lee model, is improved by introducing the consideration of superheat to increase its prediction performance. CFD modellings of heat transfer behaviors during geyser boiling were performed using both the improved and original Lee model based on VOF method. These results were analyzed and compared to the visualized observations from experimental tests. The experimental results show that a periodic geyser boiling with the cycle time at 80-100â¯s occurs under the conditions that the flow rate of heating water is controlled at 400â¯mL/min (95â¯Â°C) and cooling water at 300â¯mL/min (30â¯Â°C). The corresponding modelling results in accordance with these experimental conditions suggest that the improved Lee model has a better prediction performance. The rapid slug bubble growth in expulsion period, and the surface evaporation and thermally natural convection in liquid pool during the incubation period are in good agreement with the experimental observations. In addition, the temperature and velocity contours during geyser boiling are comprehensively revealed by use of the improved Lee model.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Heat and Mass Transfer - Volume 121, June 2018, Pages 703-714
Journal: International Journal of Heat and Mass Transfer - Volume 121, June 2018, Pages 703-714
نویسندگان
Xiaoyuan Wang, Yinfeng Wang, Haijun Chen, Yuezhao Zhu,