Keywords and Phrases
Hydrodynamic interaction; Lift-hyperlayer mode; Particle shape separation; Rodlike particles; Slender body theory
"Size separation of spherical and rod-like particles in Flow Field-flow Fractionation was investigated theoretically. The effect of cross flow migration and rod orientation was also investigated as a new mode of study. It has been shown that the rod local orientation makes different diffusivity values in comparison with spherical particles and helps particle separation. Additionally, a new mechanism of lift-hypelayer mode was used for rod-like particles which can be compared with steric mode of spherical particles. This mechanism is said to be due to hydrodynamic interaction of rod-like particle with wall and with other rods.
As a measure of axial and cross flow velocity, Peclet number was defined in each case with respect to spherical particle or rod-like particle. Based on different Peclet numbers, operations were divided into four different regions each with a dominant mode. Additionally, retention ratio of each particle category was calculated using concentration profile and velocity profile. Summing up all the effects, the conclusion was drawn that according to what size of particle to separate, one should choose proper axial and cross-flow velocity together with proper mode of operation.
Finally, based on theoretical studies, it was concluded that shape separation of rod-like particles is feasible for particles in micro size. However, for smaller particles experimental investigation may be needed."--Abstract, page iv.
Chemical and Biochemical Engineering
M.S. in Chemical Engineering
Missouri University of Science and Technology. Department of Chemical and Biochemical Engineering
Missouri University of Science and Technology
Journal article titles appearing in thesis/dissertation
- Theoretical analysis of the local orientation effect and the lift-hyperlayer mode of rod-like particles in field-flow fractionation
viii, 35 pages
© 2014 Mehrdad Alfi, All rights reserved.
Thesis - Open Access
Nanotubes -- Testing
Electronic OCLC #
Alfi, Mehrdad, "Theoretical analysis of shape separation of particles using flow field-flow fractionation" (2014). Masters Theses. 7262.