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Removal of surface adhered particles by surfactants and fluid motions
Author(s) -
Batra Ashish,
Paria Santanu,
Manohar C.,
Khilar Kartic C.
Publication year - 2001
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.690471118
Subject(s) - pulmonary surfactant , penetration (warfare) , particle (ecology) , surface finish , surface roughness , adsorption , materials science , particle size , diffusion , surface force , substrate (aquarium) , asperity (geotechnical engineering) , mechanics , chemistry , composite material , thermodynamics , geology , physics , biochemistry , oceanography , organic chemistry , operations research , engineering
Removing or detaching particles from a surface is of interest in filter bed regeneration, cleaning of semiconductor surfaces, migration of fines in underground reservoirs, and detergency. A two‐stage removal process proposed involves penetration of the surfactant solution, diffusion and adsorption of surfactant molecules, followed by the particle removal by hydrodynamic force. The particle‐substrate system, considered here as a plate‐plate system, takes into account the surface roughness of the substrate in the form of asperities. The concept of critical hydrodynamic force required to remove or detach a particle adhering to a substrate in the presence of surfactant solution is discussed, as well as its calculation of typical values. The critical hydrodynamic force depends on the surface roughness, particle size, and other parameters of the system. When asperity size is comparable to the equilibrium distance of separation, the critical hydrodynamic force becomes very large in magnitude, indicating that particle removal is very difficult. Higher critical hydrodynamic force is required for the removal of particles of small size.