Characterization of the critical transition from annular to wavy-stratified flow for oilawater mixtures in horizontal pipes

The transition from annular to wavy-stratified oilawater adiabatic flow within horizontal pipes is experimentally analyzed, and a semiempirical model is proposed. The transition is referred to as critical because it occurs suddenly, giving rise to a sharp and strong increase in the pressure drop due...

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Bibliographic Details
Published in:Experiments in fluids 2012-11, Vol.53 (5), p.1617-1625
Main Authors: Colombo, Luigi PM, Guilizzoni, Manfredo, Sotgia, Giorgio M
Format: Article
Language:English
Subjects:
Adiabatic flow
Annular
Boundaries
Horizontal
Pipe
Pressure drop
Tap water
Walls
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Summary:The transition from annular to wavy-stratified oilawater adiabatic flow within horizontal pipes is experimentally analyzed, and a semiempirical model is proposed. The transition is referred to as critical because it occurs suddenly, giving rise to a sharp and strong increase in the pressure drop due to the contact of the high-viscosity oil with the pipe wall. This could lead to a dangerous accident in pipelines. Experimental runs were performed on eight test sections of both PlexiglasARG and PyrexARG pipes with internal diameters ranging from 21.5 to 50 mm, using tap water and oil with viscosity about 880 times higher than that of water. On the basis of pressure drop measurement and flow pattern visualization, the transition boundary between annular and wavy-stratified flow was analytically determined and compared with flow pattern maps.
ISSN:0723-4864
1432-1114
DOI:10.1007/s00348-012-1378-1