کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
661520 1458176 2006 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Critical heat flux in thin, uniform particle coatings
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
Critical heat flux in thin, uniform particle coatings
چکیده انگلیسی

Pool boiling on thin, uniform porous coatings is examined experimentally using different copper particle diameters (between 40 and 80 μm), fabrications (loosely packed, shaken, or pressed), and particle characteristics (solid or porous particle) with coating thickness varying between 3 and 5 particle diameters. The results show that the critical heat flux (CHF) is about 1.8 times for all the coatings, while the pre-CHF regime shows variations. We suggest that the presence of the thin, uniform porous coating influences the hydrodynamic (macroscale) stabilities such that statistically the critical Rayleigh–Taylor wavelength decreases and/or the vapor area fraction increases in a manner to statistically cause a decrease in the dominant interfacial wavelength. By the CHF experimental results, it is postulated that for a 2-fold increase in CHF, the wavelength in the Zuber CHF model is nearly one-fourth of that for plain surface, or the area of the vapor channels increases by 22/3 (compared to plain surface).

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Heat and Mass Transfer - Volume 49, Issues 5–6, March 2006, Pages 844–849
نویسندگان
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