کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7060100 1458474 2018 14 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Predicting the critical heat flux in pool boiling based on hydrodynamic instability induced irreversible hot spots
ترجمه فارسی عنوان
پیش بینی شار حرارتی بحرانی در جوشاندن استخر با توجه به بی ثباتی هیدرودینامیکی ناشی از نقاط گرم غیر قابل برگشت
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
چکیده انگلیسی
A new model, based on the experimental observation reported in the literature that CHF is triggered by the Irreversible Hot Spots (IHS), has been developed to predict the Critical Heat Flux (CHF) in pool boiling. The developed Irreversible Hot Spot (IHS) model can predict the CHF when boiling methanol on small flat surfaces and long horizontal cylinders of different sizes to within 5% uncertainty. It can also predict the effect of changing wettability (i.e. contact angle) on CHF to within 10% uncertainty for both hydrophilic and hydrophobic surfaces. In addition, a linear empirical correlation has been developed to model the bubble growth rate as a function of the system pressure. The IHS model with this linear bubble growth coefficient correlation can predict the CHF when boiling water on both flat surfaces and long horizontal cylinders to within 5% uncertainty up to 10 bar system pressure, and the CHF when boiling methanol on a flat surface to within 10% uncertainty up to 5 bar. The predicted detailed bubble grow and merge process from various sub-models are also in good agreement with the experimental results reported in the literature.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Multiphase Flow - Volume 104, July 2018, Pages 174-187
نویسندگان
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