کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7059441 | 1458088 | 2012 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Phenomena that accompany the condensation of R404A refrigerant in multiports during hydrodynamic instabilities
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
جریان سیال و فرایندهای انتقال
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چکیده انگلیسی
Experimental research results are presented concerning the condensation of the R404A refrigerant in a five-channel multiport, which is fed in parallel and consists of mini-channels with internal diameter d = 0.90 and 3.30 mm. The research was performed in the presence of periodic instabilities generated in a frequency range from 5 to 0.2 Hz. During condensation in the multiport, the impact of instabilities is considerably stronger that in the case of single mini-channels. It was found that the temperature profiles and pressure profiles became deformed in each of the mini-channels of the multiport during the condensation process with the generated instabilities. These deformations decreased the value of heat transfer coefficient h, whose value depends on the diameter d of the multiport mini-channels, vapour quality x and the frequency f of the disturbances generated.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Heat and Mass Transfer - Volume 55, Issues 25â26, December 2012, Pages 7718-7727
Journal: International Journal of Heat and Mass Transfer - Volume 55, Issues 25â26, December 2012, Pages 7718-7727
نویسندگان
Waldemar KuczyÅski,