Hydraulic Analysis of Two Phase Flow in Helical Pipes: Turbulence and Population Balance Modeling

سال انتشار: 1390
نوع سند: مقاله کنفرانسی
زبان: انگلیسی
مشاهده: 631

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شناسه ملی سند علمی:

ICHEC07_287

تاریخ نمایه سازی: 25 فروردین 1394

چکیده مقاله:

Hydraulic analysis of air-water tow phase flow in helical pipes is investigated using computational fluid dynamics. The main attention of this work focuses on comparison of the results of the k-ε turbulence model and Shear Stress Transport (SST) turbulence model, by applying Multiple Size Group (MUSIG) model for size distribution coupled with models for coalescence and breakup of bubble groups. For comparison purposes, the pressure drop results of flow along the length of the helical pipes of those models are compared with the correlated experimental data. The results of the SST-MUSIG combined model are more accurate than the other situations. The detailed analysis of the flow in the helical pipes has been carried out by plotting of contour plots of velocity, pressure and air void fraction . After pouring the two phase flow of dispersed air in water, the air bubbles are immediately aggregated and concentrated to the inner side of the pipe wall while the mean bubbles diameter along the flow are nearly constant. The secondary flows inhibits the bubbles aggregation, conversely, the buoyancy forces in turbulence flow are the main causes of collision of bubbles in helical pipes. On the other side, the centrifugal forces lead to the higher concentration region of water lies at the outer side of the pipe walls.

کلیدواژه ها:

Helical Pipes ، Air-water two Phase Flow ، Multiple Size Group Model ، Shear Stress Transport Model

نویسندگان

Mahmood Reza Rahimi

Chemical engineering department, School of engineering,Yasouj University, Yasouj ۷۵۹۱۸-۷۴۸۳۱, Iran

Mehdi Ghanbari

Chemical engineering department, School of engineering,Yasouj University, Yasouj ۷۵۹۱۸-۷۴۸۳۱, Iran

Aboalfazl Askari

Chemical engineering department, School of engineering,Yasouj University, Yasouj ۷۵۹۱۸-۷۴۸۳۱, Iran

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