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Phase Transition And Surface Sublimation Of A Mobile Potts Model, A. Bailly Reyre, H. T. Diep, M. Kaufman
Phase Transition And Surface Sublimation Of A Mobile Potts Model, A. Bailly Reyre, H. T. Diep, M. Kaufman
Miron Kaufman
We study in this paper the phase transition in a mobile Potts model by the use of Monte Carlo simulation. The mobile Potts model is related to a diluted Potts model, which is also studied here by a mean-field approximation. We consider a lattice where each site is either vacant or occupied by a q-state Potts spin. The Potts spin can move from one site to a nearby vacant site. In order to study the surface sublimation, we consider a system of Potts spins contained in a recipient with a concentration c defined as the ratio of the number of …
Moffatt Eddies In The Single Screw Extruder: Numerical And Analytical Study, Petru S. Fodor, Miron Kaufman
Moffatt Eddies In The Single Screw Extruder: Numerical And Analytical Study, Petru S. Fodor, Miron Kaufman
Miron Kaufman
A detailed analysis of the fluid flow in the single screw extruder is performed by combining numerical and analytical methods. While finite element analysis numerical models are used to extract the transversal velocity field, an analytical model in the limit of zero Reynolds numbers is used to determine the longitudinal component of the fluid velocities. The high resolution 3D model developed for the fluid flow in single screw extruders with aspect ratios (i.e. depth/width) ranging from 1 to 0.1, allows the identification of the position and extent of Moffatt eddies that impede the fluid mixing through the entire extruder’s volume. …