کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
667223 1458504 2015 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Interrogating the effect of an orifice on the upward two-phase gas–liquid flow behavior
ترجمه فارسی عنوان
بازجویی اثر یک دیافراگم در رفتار جریان مایع گاز دو مرحلهای به سمت بالا
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
چکیده انگلیسی


• Recovery lengths are 20, 10 and 7D respectively for bubbly, slug and churn flow.
• Homogenization requires a minimum liquid superficial velocity.
• There is persistence of frequency across this fitting for bubbly and slug flows.

Experiments are reported on an air–water mixture flowing through an orifice in a vertical pipe. Time series of cross-sectionally averaged void fractions have been measured at nine axial positions by using a conductance probe technique. A series of six orifices with different thicknesses and apertures were employed. The Probability Density Function, the Power Spectral Density of the time series of cross sectionally averaged void fractions and the cross-correlation of time series from adjacent probes have been obtained to determine the effect of the orifice on the flow characteristics. The diameter area ratio and the thickness of the orifice have a higher influence on bubbly than on slug and churn flows. The recovery length is about 20, 10 and 7 pipe diameter downstream the orifice for these three flow patterns respectively. Homogenization effect needs a minimum liquid superficial velocity. Its position occurs depends on the value of this velocity and on the orifice fractional open area.Just downstream the orifice, the structure velocity increases for the bubbly and slug flows and decreases for churn flow. For bubble and slug flows, there is persistency of the frequency when passing through the orifice from the upstream to the downstream pipe.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Multiphase Flow - Volume 74, September 2015, Pages 96–105
نویسندگان
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