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The present paper enumerates a CFD model developed for a 76-mm Dense Medium Cyclone (DMC) using Ansys Fluent Software to gain insights into the separation of particles according to their size and density. The simulation used in this paper includes Reynolds stress model to predict the turbulence inside the cyclone body. An Eulerian–Eulerian multiphase CFD model was applied to model a number of physical aspects such as the separation of coal particles and the segregation of magnetite media solids. The experimental results generated in a laboratory-scale DMC were used for the validation purpose, and the predicted results of CFD have been validated for the flow splits of water, magnetite, and coal. The simulation results obtained from the Eulerian–Eulerian multiphase model reveal that the prediction is in good agreement with experimental results and match reasonably well in terms of the mass flow rates of water, magnetite, and coal. Furthermore, the partition curve of the DMC when mapped for the separation of −3.0 + 0.50 mm size also showed to be in agreement with the experimentally obtained curves. The gravity of cut (SG50) has also been predicted by the Eulerian–Eulerian multiphase CFD model and was found to be in the vicinity of observed experimental value of SG50. [ABSTRACT FROM AUTHOR]

This paper studies the passive electromagnetic damper effects on the behavior of a pipeline conveying fluid. In this work, a uniform cantilever Euler–Bernoulli beam, a follower force, and a transversal force are utilized for modeling of the pipe, fluid force, and electromagnetic damping force, respectively. The passive electromagnetic damper includes a permanent-magnet DC motor, a ball screw, and a nut. The most important purpose of this study is first to decrease the pipe vibration amplitude resulting from the fluid velocity and then transform the dissipated energy into the electric energy. To achieve this goal, the stability and vibration of the model were investigated using Ritz and Newmark methods. The effects of the electromagnetic damper characteristics on the critical velocity were considered first, and then the energy storage of the passive electromagnetic damper was inspected. The results of simulation showed that the passive electromagnetic damper can simultaneously reduce the pipeline vibration and store energy up to 4.3 [mW] for low fluid flow velocity. [ABSTRACT FROM AUTHOR]

In this paper, the electromagnetic damper (EMD), which is composed of a permanent-magnet rotary DC motor, a ball screw and a nut, is considered to be analyzed as a semi-active damper. The main objective pursued in the paper is to study the two degrees of freedom (DOF) model of the semi-active electromagnetic suspension system (SAEMSS) performance and energy regeneration controlled by on-off and continuous damping control strategies. The nonlinear equations of the SAEMSS must therefore be extracted. The effects of the EMD characteristics on ride comfort, handling performance and road holding for the passive electromagnetic suspension system (PEMSS) are first analyzed and damping control strategies effects on the SAEMSS performance and energy regeneration are investigated next. The results obtained from the simulation show that the SAEMSS provides better performance and more energy regeneration than the PEMSS. Moreover, the results reveal that the on-off hybrid control strategy leads to better performance in comparison with the continuous skyhook control strategy, however, the energy regeneration of the continuous skyhook control strategy is more than that of the on-off hybrid control strategy (except for on-off skyhook control strategy). [ABSTRACT FROM AUTHOR]