کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4994431 1458033 2017 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Characteristics of heat transfer for CO2 flow boiling at low temperature in mini-channel
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
Characteristics of heat transfer for CO2 flow boiling at low temperature in mini-channel
چکیده انگلیسی
This paper presents an experimental and theoretical investigation on two-phase flow boiling heat transfer with carbon dioxide (CO2 or R744) as the refrigerant in horizontal small diameter tube at low temperature. The experimental data were obtained in the following condition, the heat flux is 7.5-30 kW/m2; the mass flow rate is 300-600 kg/m2 s; the saturation temperature is 233-273 K; the test section is made of stainless steel tubes whose inner diameters are 0.6 and 1.5 mm. The experimental results show that heat transfer coefficient increases with the increase of mass flow rate, but decreases with the increase of tubes' inner diameter and saturation temperature, the boiling heat transfer of CO2 has a greater effect on nucleate boiling and highly depends on heat flux. The comparative study indicates that: during the existed flow boiling heat transfer model, the model which has the best prediction accuracy presented with 79.8% of predicted points within ±30% and 21.8% mean deviation before the dryout phenomenon happened, while it was only 18.4% and 59.9% after the dryout phenomenon happened.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Heat and Mass Transfer - Volume 108, Part B, May 2017, Pages 2120-2129
نویسندگان
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