کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7051866 1368140 2018 32 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Experimental study of pool boiling heat transfer on novel bistructured surfaces based on micro-pin-finned structure
ترجمه فارسی عنوان
بررسی تجربی انتقال حرارت گرمایش بادی در سطوح جدید بر پایه ساختار میکرو پین فین
کلمات کلیدی
سطح بی نظیر، میکرو پین فین، جوشاندن استخر، پدیده میکرونیزه،
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
چکیده انگلیسی
The pool boiling heat transfer performance of bistructured surface based on micro-pin-finned structure was experimentally investigated in this study. A high speed camera with microscope was applied to capture the micronization boiling phenomenon and study the mechanism of bistructured surfaces. The micro-pin-finned area and the smooth area are fractally distributed on the heating surface by micromaching (dry etching) method. The P-doped silicon chips with 6 different surface types -- smooth chip, PF30-60 (micro-pin-fins with 30 μm fin side length and 60 μm fin height), PF30-60LS (large smooth strips distributed in micro-pin-finned area), PF30-60SS (small strips distributed in micro-pin-finned area), PF30-60LP (large smooth passages distributed in micro-pin-finned area) and PF30-60SP (small passages distributed in micro-pin-finned area) were tested in FC-72. The experimental results indicate that the bistructured surfaces can efficiently enhance the heat transfer performance in the nucleate boiling region, and the critical heat flux (CHF) is also significantly improved. From the micronization boiling phenomenon it can be observed that the bistructured surfaces can lead to a more vitality of bubbles: large number of nucleation sites are formed in the micro-pin-finned area, and the small bubbles grow, collide, merge and move rapidly to the nearby smooth channel. When the bubble grows large enough, it will departure quickly under the force of channel pressure. The micronization phenomenon also reveals that the boundary lines between the structured and smooth areas are active nucleate site region.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Experimental Thermal and Fluid Science - Volume 91, February 2018, Pages 9-19
نویسندگان
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