Single-phase and two-phase flows through helical rectangular channels in single screw expander prototype

The CFD simulations are carried out for the flows in a horizontally oriented helical pipe with various inlet sectional liquid holdups and coil pitches （ H ） . The development of the pressure fields for the single phase air flow and the air-water two-phase flow through the helical rectangular channel...

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Bibliographic Details
Published in:Journal of hydrodynamics. Series B 2014-02, Vol.26 (1), p.114-121
Main Author: 夏国栋 刘献飞 翟玉玲 崔珍珍
Format: Article
Language:English
Subjects:
Air flow
Channels
Engineering
Engineering Fluid Dynamics
flow characteristics
Helical
helical channel
Hydrology/Water Resources
Inlets
Leakage
Liquids
Numerical and Computational Physics
numerical simulation
Pressure drop
Screws
Simulation
两相流
单相
原型
水平方向
矩形通道
螺旋形
螺旋通道
螺杆膨胀机
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Summary:The CFD simulations are carried out for the flows in a horizontally oriented helical pipe with various inlet sectional liquid holdups and coil pitches （ H ） . The development of the pressure fields for the single phase air flow and the air-water two-phase flow through the helical rectangular channels is studied. The points with a higher pressure often become the position of expansion leakage. The liquid phase distribution at these points can prevent the leakage of air. It is shown that the increase of the inlet sectional liquid holdup may increase the local liquid holdup at the outmost side of the helical channel. Based on the published pressure drop correla-tion, a new modified relation for predicting the pressure drop in the helical rectangle channel is proposed.
ISSN:1001-6058
1878-0342
DOI:10.1016/S1001-6058(14)60013-5