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Trapping of solid particles at a wall in a turbulent flow
Author(s) -
Young James B.,
Hanratty Thomas J.
Publication year - 1991
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690371010
Subject(s) - turbulence , mechanics , lift (data mining) , trapping , suspension (topology) , spheres , particle (ecology) , displacement (psychology) , materials science , falling (accident) , flow (mathematics) , classical mechanics , chemistry , physics , geology , medicine , psychology , ecology , oceanography , mathematics , environmental health , astronomy , homotopy , biology , computer science , pure mathematics , psychotherapist , data mining
Studies of the motion of a dilute suspension of 100‐micron glass and stainless steel spheres in water flowing turbulently down a pipe revealed that they could be trapped in necklace formations that move slowly at a distance of less than one particle diameter from the wall. The tendency toward trapping increases with particle density and decreases with flow rate. The phenomenon is interpreted as occurring when the Saffman lift force toward the wall overcomes the ability of fluid turbulence to mix the particles. The location of the particles is dictated by a balance between the Saffman lift force and a wall‐induced force associated with the displacement of fluid as a particle moves parallel to the wall.