کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
658200 | 1458080 | 2013 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Visualization of boiling structure and critical heat flux phenomenon for a narrow heating surface in a horizontal pool of saturated water
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
A visualization study was performed to identify the near-surface boiling structure and critical heat flux (CHF) triggering mechanism in a horizontal pool boiling of saturated water using a narrow transparent ITO heating surface. Total reflection and diagonal inside view techniques were applied in a synchronized manner. Contrary to the common postulation that a thin liquid film exists under a coalesced massive bubble, the base of a coalesced massive bubble is almost dry under the conditions studied. Approaching the CHF, a small dry area is left on a boiling surface at the departure of the coalesced massive bubble. Rather than being wetted, the small residual dry area expands to a large dry area if the bubble nucleation around the residual dry area is sufficiently vigorous. This re-expansion repeats throughout consecutive departures of coalesced massive bubbles as wall superheat further increases. Then, a certain part of the residual dry area is not wetted for a sufficient time and evolves into an irreversible hot spot, leading to a boiling crisis.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Heat and Mass Transfer - Volume 62, July 2013, Pages 142-152
Journal: International Journal of Heat and Mass Transfer - Volume 62, July 2013, Pages 142-152
نویسندگان
In-Cheol Chu, Hee Cheon NO, Chul-Hwa Song,