Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7053631 | International Journal of Heat and Fluid Flow | 2014 | 12 Pages |
Abstract
Finite sized particles settling under the action of gravity are investigated by immersed boundary method for dilute suspensions and low to high range of Reynolds number. The Reynolds number based on the terminal velocity of a single particle is varied from 1 to 300 and the solid volume fraction (Ï) is varied from 0.005 to 0.05. The studied range of Reynolds number corresponds from streamlined flow to downstream vortex shedding flow for single particle. For Ï = 0.005, 0.01 and high Reynolds number (Re â§Â 175), settling particles clusters due to the entrapment in high fluid shear regions. However for Re = 50 and 100, particles form separated pairs due to relatively weak strength of wakes that promote to drafting-kissing and tumbling scenario. These particle structures at high Reynolds number changes the settling behaviors of particles e.g. increase in the settling velocity and fluid velocity fluctuations. For Ï = 0.03, 0.05, hindered settling effects dominate and reduce the effects of particles clustering due to Reynolds number.
Keywords
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Fluid Flow and Transfer Processes
Authors
Ali Abbas Zaidi, Takuya Tsuji, Toshitsugu Tanaka,