Effect Of 180° Bends On Gas/liquid Flows In
Vertical Upward And Downward Pipes
Author(s)
A. Almabrok, L. Lao & H. Yeung
Abstract
Experimental investigation has been carried out on upward and downward
vertical pipes with 180° bends to study gas-liquid two-phase flow behaviours in
pipes with serpentine configuration. Wire mesh sensor (WMS) is installed at top
and bottom positions of upward and downward sections in order to identify the
void fraction distributions. Film thickness probes are employed to obtain
circumferential profile of the liquid film thickness at different axial positions
along both sections. Further features such as flow patterns are identified by
examining the time trace and probability density function (PDF) data. All
measurements are conducted for different superficial gas velocities, while
superficial liquid velocity is fixed at 1.0 m/s.
The study identified that the centrifugal force present in 180° bends caused a
flow maldistribution in the adjacent straight sections. It is noted from the time
trace and PDF results that the superficial gas velocity has obvious effects on the
flow development along different positions of the pipes, where the flow regime
varied over whole velocity ranges tested. These results are confirmed by the
cross-sectional view and sliced stack images (longitudinal view) of the void
fraction distributions. The results also showed that the flow behaviour in upward
and downward pipes is affected by bends, although to varying degrees.
Keywords: upward, downward, 180° bends, film thickness probes, WMS.
Keywords
Keywords: upward, downward, 180° bends, film thickness probes, WMS.
Related Book
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