کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
660216 1458100 2012 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Condensation heat transfer in square, triangular, and semi-circular mini-channels
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
Condensation heat transfer in square, triangular, and semi-circular mini-channels
چکیده انگلیسی

Condensation heat transfer coefficients in mini-channels were measured with smaller measurement uncertainties than previously obtained using three specially designed copper test sections. Single-phase experiments validated the approach. Data are reported for R134a in 1 mm square, triangular, and semi-circular multiple parallel minichannels cooled on three sides. A parametric study was conducted over a range of conditions for mass flux, average quality, saturation pressure, and heat flux. Mass flux and quality were determined to have significant effects on the condensation process, even at lower mass fluxes, while saturation pressure, heat flux, and channel shape had no significant effects. The lack of shape effects were attributed to the three-sided cooling boundary conditions. Because there was no significant surface tension enhancement, the macro-scale Shah (2009) [26] correlation best predicted the data, with a mean average error (MAE) of 20–30% for all geometries.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Heat and Mass Transfer - Volume 55, Issues 1–3, 15 January 2012, Pages 187–197
نویسندگان
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