کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9691679 | 1458198 | 2005 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Convective boiling heat transfer characteristics of CO2 in microchannels
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Convective boiling heat transfer coefficients and dryout phenomena of CO2 are investigated in rectangular microchannels whose hydraulic diameters range from 1.08 to 1.54 mm. The tests are conducted by varying the mass flux of CO2 from 200 to 400 kg/m2 s, heat flux from 10 to 20 kW/m2, while maintaining saturation temperature at 0, 5 and 10 °C. Test results show that the average heat transfer coefficient of CO2 is 53% higher than that of R134a. The effects of heat flux on the heat transfer coefficient are much significant than those of mass flux. As the mass flux increases, dryout becomes more pronounced. As the hydraulic diameter decreases from 1.54 to 1.27 mm and from 1.27 to 1.08 mm at a heat flux of 15 kW/m2 and a mass flux of 300 kg/m2 s, the heat transfer coefficients increase by 5% and 31%, respectively. Based on the comparison of the data from the existing models with the present data, the Cooper model and the Gorenflo model yield relatively good predictions of the measured data with mean deviations between predicted and measured data of 21.7% and 21.2%, respectively.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Heat and Mass Transfer - Volume 48, Issue 2, January 2005, Pages 235-242
Journal: International Journal of Heat and Mass Transfer - Volume 48, Issue 2, January 2005, Pages 235-242
نویسندگان
Rin Yun, Yongchan Kim, Min Soo Kim,