Aggregation kinetics of carbonyl iron based magnetic suspensions in 2D.
We investigate the (irreversible) two-dimensional aggregation kinetics of dilute non-Brownian magnetic suspensions in rectangular microchannels using video-microscopy, image analysis and particle-level dynamics simulations. Special emphasis is given to carbonyl iron suspensions that are of interest in the formulation of magnetorheological fluids. The results are compared to non-Brownian suspensions of magnetic latexes. We demonstrate that both suspensions follow a deterministic aggregation process. Furthermore, experimental and simulation aggregation curves can be collapsed onto a master curve when using the appropriate scaling time (∝λ-1ϕ2D-2.5) as a function of only two dimensionless numbers: the lambda ratio (λ) and the particle surface fraction (ϕ2D).
Department of Applied Physics, Faculty of Sciences, University of Granada, C/Fuentenueva s/n, 18071-Granada, Spain. jvicente@ugr.es.
Keshvad
K
Shahrivar
Department of Applied Physics, Faculty of Sciences, University of Granada, C/Fuentenueva s/n, 18071-Granada, Spain. jvicente@ugr.es.
Elizabeth
E
Carreón-González
Department of Applied Physics, Faculty of Sciences, University of Granada, C/Fuentenueva s/n, 18071-Granada, Spain. jvicente@ugr.es.
Jose R
JR
Morillas
Department of Applied Physics, Faculty of Sciences, University of Granada, C/Fuentenueva s/n, 18071-Granada, Spain. jvicente@ugr.es.
Juan
J
de Vicente