کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7054623 | 1458021 | 2018 | 12 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
A comprehensive numerical study on the subcooled falling film heat transfer on a horizontal smooth tube
ترجمه فارسی عنوان
یک مطالعه جامع عددی در مورد انتقال گرما فیلم سقوط آزاد در یک لوله صاف افقی
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کلمات کلیدی
سقوط فیلم، لوله افقی انتقال گرما، شبیه سازی عددی،
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
جریان سیال و فرایندهای انتقال
چکیده انگلیسی
The effects of film flow rate, heat flux, inlet liquid temperature, tube diameter and liquid distributor height on subcooled falling film heat transfer outside a horizontal smooth tube are numerically studied, and a heat transfer correlation based on the current data is developed. Comparisons between the predicted results and the published experimental data in the literature are also conducted. The calculation ranges are: film flow rate from 0.025 to 0.284â¯kgâ¯mâ1â¯sâ1, heat flux from 1.0 to 100â¯kWâ¯mâ2, inlet liquid temperature from 2 to 104â¯Â°C, tube diameter from 6.35 to 50.8â¯mm and liquid distributor height from 3.0 to 50.8â¯mm. The results indicate that: (1) the numerical results of the local heat transfer coefficient are in good agreement with the experimental data in the literature; (2) the surface tension plays an important role in the calculations of heat transfer in two stagnation zones, (3) the heat transfer coefficient shows four distinct zones along with peripheral angle: stagnation zone, impingement zone, thermal layer development zone and departure zone; (4) the heat transfer coefficient increases with increase in film flow rate, tube diameter or liquid distributor height, while keeps constant with increasing heat flux; (5) the correlation predicts 92% of the total 141 calculated data with deviations within ±10%, and predicts 78% of 284 data available in literature with deviations within ±30%.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Heat and Mass Transfer - Volume 119, April 2018, Pages 259-270
Journal: International Journal of Heat and Mass Transfer - Volume 119, April 2018, Pages 259-270
نویسندگان
Chuang-Yao Zhao, Wen-Tao Ji, Ya-Ling He, Ying-Jie Zhong, Wen-Quan Tao,