کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4993855 1458027 2017 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Study on flow condensation characteristics of refrigerant R410a in a single rectangular micro-channel
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
Study on flow condensation characteristics of refrigerant R410a in a single rectangular micro-channel
چکیده انگلیسی
A visualization experimental investigation on the condensation heat transfer of refrigerant R410a in a rectangular micro-channel with hydraulic diameter of 0.67 mm is conducted in this paper. Experiments are conducted with saturation temperatures of 36-41 °C, and the refrigerant mass fluxes is in the range of 109-1042 kg/(m2 s) over the entire range of vapor qualities. One-dimension annular flow model is established to study the condensation heat transfer characteristics inside micro-channel. The condensate film thickness, dimensionless condensation liquid flow velocity, local heat transfer coefficient and average heat transfer coefficient are obtained to analyze the condensation heat transfer mechanism in micro-channel. The predicted value of heat transfer coefficient has great agreement with experimental data in this study. Visualization experimental results agree with condensation flow patterns map in micro-channel proposed by other researcher. Annular flow, wavy-annular flow, slug flow and bubble flow are observed along the flow direction in micro-channel under the low mass flux. Saturation pressure, mass flux, sub-cooled and vapor quality of R410a are considered. The results show that the heat transfer coefficient increases with mass fluxes and vapor quality remarkably. Experiment results are 17% higher than other research results, especially in high mass flux and vapor quality. In addition, the significant influence of sub-cooled is proposed and discussed in micro-channel condensation study. The lower sub-cooled will bring higher heat transfer coefficient.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Heat and Mass Transfer - Volume 114, November 2017, Pages 125-134
نویسندگان
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