کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
657452 1458063 2014 13 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Pool boiling enhancement through microporous coatings selectively electrodeposited on fin tops of open microchannels
ترجمه فارسی عنوان
افزایش جوش بادی از طریق پوشش های میکروپروس به صورت الکترودهایی در انتهای ریز از میکرو کانال باز
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
چکیده انگلیسی
Open microchannels and microporous coatings have been individually employed by previous investigators for enhancing pool boiling heat transfer. In this paper, their combined effect is investigated by electrodepositing microporous coatings on the fin tops of microchannels. The microporous coatings were applied using the optimal electrodeposition parameters developed in an earlier study. The effect of microchannel geometry on heat transfer performance for water boiling at atmospheric pressure on 10 mm × 10 mm copper chips is reported here. A maximum critical heat flux (CHF) of 3250 kW/m2 was obtained for Chip 9 with fin width = 200 μm, channel width = 500 μm and channel depth = 400 μm at a wall superheat of 7.3 °C. A maximum value of heat transfer coefficient (HTC) of 995 kW/m2 °C was achieved for Chip 12 with a different channel width of 762 μm for a heat flux of 2480 kW/m2 at a wall superheat of 2.5 °C. Bubble growth and heat transfer processes are altered when nucleation takes place preferentially on the fin tops. Visual studies indicate a microconvective mechanism in which bubbles leaving from the fin tops induce strong localized liquid circulation currents in the microchannels. A liquid microcirculation based theoretical model is developed to predict heat transfer under this mechanistic description. The preliminary results are in good agreement with the experimental data.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Heat and Mass Transfer - Volume 79, December 2014, Pages 816-828
نویسندگان
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