On the dispersion of solid particles in a liquid agitated by a bubble swarm

This article deals with the dispersion of solid particles in a liquid agitated by a homogeneous swarm of bubbles. The scale of interest lies between the plant scale (of the order of the tank) and the microscale (less than the bubble diameter). The strategy consists in simulating both the twophase flow of deforming bubbles and the motion of solid particles. The evolution of the spatial distribution of particles together with the encounter and entrainment phenomena is studied as a function of the void fraction and the relative size and mass of particles. The influence of the shape of the bubble and of the model of forces that govern the motion of particles is also considered

The ADF and military operations

Dale Stephens, Rob McLaughlin and Paul Muggleto

Conservation by modernization and rehabilitation

Presented at Irrigation and water resources in the 1990's: proceedings from the 1992 national conference held on October 5-7, 1992 in Phoenix, Arizona.A landmark water conservation agreement became effective in December 1989 between the Metropolitan Water District of Southern California and Imperial Irrigation District to conserve 106,110 acre-feet of water annually through the modernization and rehabilitation of Imperial Irrigation District's irrigation distribution system. The agreement provides for 17 projects (Program) to be planned, designed and implemented over a five year period, ending in 1995, plus verifying project accomplishments both from a cost and volume of water conserved standpoint. Management of the planning, design and implementation process, the process of verifying project accomplishments and three case studies demonstrating the various planning approaches used are presented