کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
646689 1457159 2014 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Experimental and theoretical investigation on two-phase flow characteristics and pressure drop during flow condensation in heat transport pipeline
ترجمه فارسی عنوان
بررسی تجربی و نظری بر ویژگی های جریان دو فاز و افت فشار در جریان تراکم جریان در خط لوله انتقال حرارت
کلمات کلیدی
سیستم خنک کننده منفعل، تغییر فاز، خط انتقال حرارت، الگوی جریان، افت فشار،
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
چکیده انگلیسی
Complex steam-liquid two phase flow exists in the heat transport pipeline connecting evaporator and condenser. Especially the flow condensation has important influence on the performance of the cooling system. The flow pattern and pressure drop in the heat transport pipeline were deeply studied in this paper. Firstly, electrical capacitance tomography was used to discern flow pattern in the heat transport pipeline. The flow pattern was compared against the predictions of Mandhane et al. flow pattern map and determined as stratified flow. Secondly, the pressure drop was measured and experimental results indicated that the pressure drop increased along with the increase of the heat load and was higher in long heat transport pipeline than in a short one. The increase in the pressure drop was also observed for smaller inclination angle and lower vapor quality. When the experimental results were compared with other five typical correlations in the literature, high deviations were observed. Then a new correlation which took into account the effects of tube diameter, length and inclination angle was developed. This correlation predicted the pressure drops within the range of ±30%. For the correlation, all droplets were regarded as a rough surface rather than a smooth surface in the tube according to the visualization results. So the friction coefficient was closer to the real experimental condition.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Thermal Engineering - Volume 66, Issues 1–2, May 2014, Pages 365-374
نویسندگان
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