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Essay example - Multiphase Environmental Flows
Pages 26 (6526 words)
Gas solid systems are usually encountered in the industries such as the chemical, petrochemical, pharmaceuticals, food, mineral processing and other industrial setups that convey solid granules using a blast of pressurized air. Pneumatic systems are used for fluid catalytic cracking, mixing, granulation, drying, transport and in mixing of small fine powders through pipes.
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The other method involves the use of Eulerian/ Lagrangian method in which the particles are treated individually or as a group tracked by the Lagrangian frame of reference. Cundall and Starck developed the discrete element method in 1979 and has been widely used for the study of parcticles in the solid state. Studies conducted using DEM coupled with CFD showed that particles move in plugs along the conveying pipes.
According to Kuang et al (2008), one of the most important technologies in the industry is dense phase pneumatic transportation of bulk material in the slug form. In his research paper, Kuang et al (2008) focuses on the numerical study of the slug flow in horizontal pneumatic conveyor by means of discrete particle simulation. Low velocity and dense gas system are common in industries such as mineral processing, agricultural industries and chemical industries. Slug flow is used in the industry to transport materials from one location to another. The slug flow is particularly considered in industries because of its ability to reduce the degradation of plant and also reduce wear. The power utilization of the system is also superior as compared to other flows. ...
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