کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7054684 1458020 2018 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Flow behavior of rapid thermal oscillation inside an asymmetric micro pulsating heat exchanger
ترجمه فارسی عنوان
رفتار جریان نوسان گرمای سریع در داخل مبدل گرمایی نامتقارن کوچک
کلمات کلیدی
مبدل حرارتی نامتقارن، تجسم جریان، نوسان حرارتی، نسبت پر شدن بهینه،
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
چکیده انگلیسی
This study has investigated the rapid thermal oscillatory flow in an asymmetric micro pulsating heat exchanger (MPHE). In the design and fabrication of the MPHE, a transparent acrylic plate was attached to the stainless steel plate on which 14 parallel rectangular channels were formed. As working fluids, FC-72 and ethanol were tested. The fluid inside the micro channel moves rapidly with pulsating motions by swelling and shrinking of liquid slug/gas plug at evaporation and condensation sections. By measuring the temperature variations from start-up to steady state operation, the effective thermal conductivities were evaluated. Since the filling ratio of working fluid plays an important role in heat exchanger efficiency, the optimum filling ratio was found for each working fluid. From the flow visualization inside the MPHE filled with FC-72, two different flow modes - oscillatory eruption mode and circulation mode - occurs according to the filling ratio. The circulating motion which occurs at the optimum filling ratio, helps the heat transfer into the cooling water more active than the oscillatory eruption mode.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Heat and Mass Transfer - Volume 120, May 2018, Pages 923-929
نویسندگان
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