کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7056665 1458057 2015 16 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Experimental and computational investigation of interfacial shear along a wavy two-phase interface
ترجمه فارسی عنوان
بررسی تجربی و محاسباتی برش بین فازی در امتداد یک رابط دو فازی موج دار
کلمات کلیدی
امواج متقاطع، کشش چسبندگی بین دو طرف، شکل متقاطع کشیدن، انتشار دیود
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
چکیده انگلیسی
This study explores the complex fluid flow behavior adjacent to the interface between parallel layers of gas and liquid. Using water and nitrogen as working fluids, the interface is examined experimentally using high-speed video, and the flow structure predicted using FLUENT. The computational model is used to analyze the gas flow near the interface by isolating and examining a domain that represents an instantaneous snapshot of the wavy interface. Both the observed and computed interfaces show appreciable interfacial waviness, which increases in intensity with increasing flow rates; they also show gas entrainment effects at high flow rates. The computed results show turbulence is completely suppressed along the interface by surface tension. Computed velocity vector plots, contour plots and flow streamlines show interfacial flow separation on the gas side, and these effects are amplified with increasing gas Reynolds number. This produces form drag along the wavy interface in addition to the viscous drag. The interfacial viscous and form drag components increase monotonically with increasing ratio of wave height to wavelength because of the increased frictional resistance and flow separation effects, respectively. A new relation for the interfacial friction factor is derived from the computational results, which agrees well with prior turbulent flow correlations.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Heat and Mass Transfer - Volume 85, June 2015, Pages 265-280
نویسندگان
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