کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
688151 | 1460091 | 2014 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Investigation of nanofluid bubble characteristics under non-equilibrium conditions
ترجمه فارسی عنوان
بررسی ویژگی های حباب نانو در شرایط غیر تعادل
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کلمات کلیدی
حباب، خط سه گانه، زاویه تماس، تنش سطحی سطح، نانوذرات، نانوفیلد ها، یانگا معادله لاپلاس، رطوبت سطح،
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
تکنولوژی و شیمی فرآیندی
چکیده انگلیسی
We report experimental and theoretical investigations of the bubble characteristics during the oscillatory growth period for several nanofluids. The nanoparticles were found to affect liquid-gas and solid surface tensions, which modulated the bubble contact angle, radius of triple line, bubble volume and the dynamics of bubble growth. To increase the accuracy of the Young-Laplace equation predictions during the bubble growth in the oscillatory period, a new method multi-section bubble (MSB) approach was developed. In this method, the bubble was divided into n sections (i.e., n = 1:N) and the Young-Laplace equation was solved for each section individually. As N increases, within each section the effects of inertia force and viscosity become reduced comparing to that of the liquid-gas surface tension. Unlike the conventional Young-Laplace approach (i.e., N = 1), the new approach is able to predict the bubble characteristics reliably in the following cases: (a) the oscillatory period when bubble is fluctuating; (b) the departure period when bubble is stretched upward, right before departure; and (c) the high shear stress condition when gas velocity is relatively high.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Engineering and Processing: Process Intensification - Volume 86, December 2014, Pages 116-124
Journal: Chemical Engineering and Processing: Process Intensification - Volume 86, December 2014, Pages 116-124
نویسندگان
Saeid Vafaei, Theodorian Borca-Tasciuc, Dongsheng Wen,