Numerical and physical modelling of bubbly flow phenomena
Abstract
The ulitmate purpose is to put the widely used engineering averagedequations models of multiphase flows on a firmer footing by comparing their results with those of direct numerical multiparticle simulations and rigorouslyderived averaged equations. Since the averagedequations models are comparatively well developed, in the first year of this project the focus was on the multiparticle simulation and ensemble averaging techniques. The progress to date is described for the several problems that are being studied. The first problem addresses the derivation of ensembleaveraged equations for the propagation of pressure waves in bubbly liquids. The result is in the form of an expansion for small gas volume fraction. Previously known results are recovered at first order and in certain limits at higher order. However, a new insight into the structure of the expansion and the role of bubblebubble interaction and surface deformations is obtained from this work.
 Publication:

Johns Hopkins Univ. Final Report
 Pub Date:
 March 1990
 Bibcode:
 1990jhu..rept.....P
 Keywords:

 Bubbles;
 Mass Transfer;
 Mathematical Models;
 Multiphase Flow;
 Viscous Drag;
 Wave Propagation;
 Acceleration (Physics);
 Deformation;
 Resonance;
 Sound Waves;
 Fluid Mechanics and Heat Transfer