Particle imaging velocimetry of a wet aqueous foam with an underlying liquid film |
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Authors: | E Blondin L Doubliez |
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Institution: | (1) Université de Nantes, Faculté des Sciences et des Techniques Laboratoire de Génie des Procédés (UPRES-EA 1152) 2, rue de la Houssinière, BP 92208, 44322 Nantes CEDEX 3 France e-mail: blondin@physique.univ-nantes.fr Tel.: +33-0251-125505, Fax: +33-0251-125505, FR |
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Abstract: | We investigate the utility of particle imaging velocimetry (PIV) for performing kinematic measurements in wet aqueous foam
with a liquid film beneath it. The flow velocities are measured near the walls of a square cross-section horizontal duct.
The flow velocities are useful for validating the rheological models. We show that there is a discrepancy between the velocity
profiles in the wet foam and the Bingham plastic model of flow. The velocity measurements reveal a more complex flow pattern,
which may be analysed following three different regimes: a plug flow, a shear flow in a vertical plane and a three-dimensional
shear flow. The transition between the plug flow and the shear flows may be explained by a shear-induced migration of bubbles.
Received: 25 April 2000 / Accepted: 26 February 2001 |
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