Development of a novel method for slip velocity of fluid structure interactions by employing effects of electrostatic attraction on the surface of nano-scale particles

Abstract eng:
A new model for slip velocity in a mixture model, based on a Lagrangian approach, is investigated by implementing important forces on the nano-scale structures. The model is then used to simulate a cavity flow filled with Alumina nanofluid. The results of CFD simulation are compared with experimental measurement. CFD analyses are performed via a Eulerian mixture model in ANSYS-FLUENT 15.0. Two important parts of this approach consist of the transport properties of the nanofluid and the relative velocity between particles and the fluid phase. The usual default relative velocity in the CFD software comes from gravity and drag force as the main phenomena. However, other exchange forces need to be considered as well. Therefore, slip velocity due to Brownian diffusion, virtual mass, pressure gradient and thermophoretic forces are also implemented as a user defined function. The influences of attractive theory are added to the new slip velocity model. The results of simulation have been found to be in agreement with experimental measurements. The numerical findings prove that electrostatic forces have an effect on fluid structure, especially velocity and particles distribution. Consequently they should be accounted for in slip velocity.

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