On elongated air pockets in downward sloping pipes

The behaviour of elongated air pockets in downward sloping pipes is investigated. The observed flow regimes in co-current air-water flow in downward sloping pipes are described. The effects of pipe diameter and surface tension on the air pocket motion are quantified and two criteria for the observed...

Full description

Saved in:
Bibliographic Details
Published in:Journal of hydraulic research 2010-08, Vol.48 (4), p.499-503
Main Authors: Pothof, Ivo, Clemens, Francois
Format: Article
Language:English
Subjects:
Air pockets
Air-water flow
bubble
bubble rise velocity
Criteria
Earth sciences
Earth, ocean, space
Elongation
Engineering and environment geology. Geothermics
Engineering geology
Exact sciences and technology
Fluid dynamics
Fluid flow
hydraulic jump
Hydraulics
Hydrology. Hydrogeology
Pipe
pipe flow
Stems
stratified flow
two-phase flow
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The behaviour of elongated air pockets in downward sloping pipes is investigated. The observed flow regimes in co-current air-water flow in downward sloping pipes are described. The effects of pipe diameter and surface tension on the air pocket motion are quantified and two criteria for the observed flow regime transitions are derived. One criterion stems from energy considerations and marks the transition from the presence of one elongated air pocket to multiple air pockets. The second criterion predicts the required water velocity to start the motion of elongated air pockets in the downward direction. Both criteria were validated with experimental data for a range of downward sloping pipe angles, lengths and diameters.
ISSN:0022-1686
1814-2079
DOI:10.1080/00221686.2010.491651