کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4994678 1458037 2017 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Smart surface in flow boiling: Spontaneous change of wettability
ترجمه فارسی عنوان
سطح هوشمند در جوش جوش: تغییرات خودبخودی تبرید
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
چکیده انگلیسی
We examined the heat transfer coefficients (HTC) and critical heat fluxes (CHF) in flow boiling on titanium dioxide (TiO2) and zinc oxide (ZnO) coated surfaces that are suggested as smart surfaces in this study. These surfaces were initially hydrophobic; they induced early onset of nucleate boiling (ONB), and many nucleation sites were observed at the initial stage of boiling compared with the SiO2 reference surface. As a result, high HTCs were identified on the smart surfaces. Additionally, under high wall superheat conditions, the surfaces became hydrophilic; there was no degradation of CHF by promoting water supply to dry areas. The results were attributed to spontaneous change of wettability of the smart surfaces. We investigated the contact angles of the surfaces after they underwent heat treatment. The contact angles decreased on the smart surfaces as the temperature increased. In conclusion, we postulated that the change in the wettability characteristics was a key factor in explaining the improvement of the HTC without degradation of the CHF, and suggest the smart surfaces.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Heat and Mass Transfer - Volume 105, February 2017, Pages 147-156
نویسندگان
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