Core-annular flow through a horizontal pipe: Hydrodynamic counterbalancing of buoyancy force on core

Core-annular flow through a horizontal pipe: Hydrodynamic counterbalancing of buoyancy force on core

Ooms, G.
Vuik, C.
Poesio, P.

Mechanical, Maritime and Materials Engineering

Process and Energy

2007-09-28

A theoretical investigation has been made of core-annular flow: the flow of a high-viscosity liquid core surrounded by a low-viscosity liquid annular layer through a horizontal pipe. Special attention is paid to the question of how the buoyancy force on the core, caused by a density difference between the core and the annular layer, is counterbalanced. From earlier studies it is known that at the interface between the annular layer and the core waves are present that move with respect to the pipe wall. In the present study the core is assumed to consist of a solid center surrounded by a high-viscosity liquid layer. Using hydrodynamic lubrication theory (taking into account the flow in the low-viscosity liquid annular layer and in the high-viscosity liquid core layer) the development of the interfacial waves is calculated. They generate pressure variations in the core layer and annular layer that can cause a net force on the core. Steady eccentric core-annular flow is found to be possible.

hydrodynamics
pipe flow
viscosity

http://resolver.tudelft.nl/uuid:38d72fb8-7382-4c0c-954b-da2f324ae281

https://doi.org/10.1063/1.2775521

American Institute of Physics

1070-6631

http://link.aip.org/link/PHFLE6/v19/i9/p092103/s1

Physics of Fluids, 19 (9), 2007

Institutional Repository

journal article

(c) 2007 The Author(s); American Institute of Physics