کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4992894 1457469 2017 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Visualization of flow patterns and bubble behavior during flow boiling in open microchannels
ترجمه فارسی عنوان
تجسم الگوهای جریان و رفتار حباب در طی جریان جوش در میکرو کانال های باز
کلمات کلیدی
جریان جوش، میکروکانالهای باز، الگوهای جریان، رفتار حباب، ناپایداری جریان
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
چکیده انگلیسی
Flow boiling in microchannels is favored by the heat transfer community due to the high heat transfer rates that can be obtained with lower mass flow rates. However, the heat transfer rates for flow boiling in microchannels are impacted by flow reversals and flow instabilities. An open microchannel structure was recently proposed to reduce the impact of the flow boiling instabilities. Subcooled flow boiling experiments were conducted in open microchannels using deionized water. The open microchannels had 6 parallel channels with a 0.3 mm uniform thickness gap above them The channels were fabricated on a 6 mm × 40 mm copper block. The channels were 0.5 mm wide and 0.3 mm deep with 0.43 mm wide fins between them. Flow visualizations were performed with a high-speed CCD camera with the results showing that the flow regimes in the open microchannels differ from those in closed microchannels with stratified flow and no flow instability. Two types of confined bubbles were observed with characterizations of the effects of the bubbles on each other. The heat transfer mechanisms for flow boiling in open microchannels are also described.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Communications in Heat and Mass Transfer - Volume 85, July 2017, Pages 131-138
نویسندگان
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