Modeling of Mixing Diesel-CNG in a Horizontal Pipe under the Influence of a Magnetic Field
Keywords:Two-phase flow, Bubbly flow, Magnetic field, Volume-of-fluid (VOF)
Modeling of Diesel-CNG bubbly flow with effecting magnetic field is presented in this paper. The incompressible Navier-Stokes equations have been used to solve the Diesel-CNG two phase flows in a horizontal pipeline. The simulation was carried out using ANSYS fluent software and the flow field discretization was achieved by the Volume-Of-Fluid method (VOF) technique. The interface between the gaseous and liquid phases was described by a phase field function VF, when the phase interface crosses a mesh element- 0 < VF < 1. The results showed that CNG bubbles tend to migrate toward the upper wall under buoyancy effect and these bubbles grow to a larger volume and expand vertically in the diesel flow before it breaks away with effecting magnetic field 0.4 to 0.8 Tesla, and the gas volume fraction values increased by increasing the magnetic intensity. The laminar behavior of the flow changed in the upper zone of the pipe to increasing gas volume fraction, while the axial diesel velocity decreased and the profiles tended to flatten with increasing the magnetic field strength. The numerical procedure was validated by comparing the computational results with experimental data reported in the literature and a good agreement was achieved.
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