کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
10391764 885003 2011 15 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Carbon dioxide flow boiling in a single microchannel - Part II: Heat transfer
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
Carbon dioxide flow boiling in a single microchannel - Part II: Heat transfer
چکیده انگلیسی
Flow boiling heat transfer coefficients of CO2 have been measured in a single microchannel. Experiments were carried out in a horizontal stainless steel tube of 0.529 mm inner diameter, for three temperatures (−10, −5 and 0 °C), with the mass flux ranging from 200 to 1200 kg/m2 s and the heat flux varying from 10 to 30 kW/m2. The investigation covered qualities from zero to the dryout inception, i.e. pre-dryout conditions. Compared to larger microchannels and positive temperatures, a higher contribution of convective boiling was found, with a larger heat transfer coefficient than for pure nucleate boiling. Mainly two heat transfer regimes were found, depending on the boiling number (Bo). For Bo > 1.1 × 10−4, the heat transfer coefficient was highly dependent on the heat flux and moderately influenced by the quality and the mass flux. For Bo < 1.1 × 10−4, the heat transfer coefficient was hardly affected by the heat flux but strongly influenced by the quality and the mass flux. In addition, dryout results were reported. The effect of the mass flux on the dryout inception quality was found to be highly dependent on the heat flux and the saturation temperature.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Experimental Thermal and Fluid Science - Volume 35, Issue 4, May 2011, Pages 597-611
نویسندگان
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