Modelling of an MHD system to investigate an ionised gas flow inside a rectangular duct

  • Ayokunle O. Ayeleso
  • Mohamed T.E. Kahn
  • Atanda K. Raji


The magnetohydrodynamics, MHD system (direct energy conversion system) is an alternative system that can provide supplementary power to the existing conventional systems. This system can also be used to provide thrusting force for thrusters, which are usually difficult to pump using the conventional pumps and require high flow rates and velocity. In the present study, the focus is to investigate MHD generators and thrusters by performing a three-dimensional (3-D) simulation of an ionised gas (fluid) flow inside a rectangular duct. The working fluid considered for this investigation is a propane gas, with electrical conductivity of 20 S/m. Subsequently, the gas flow is modelled numerically with different inflow velocities: 0.2 m/s, 0.5 m/s, 1 m/s, 2 m/s and 5 m/s and solve iteratively using the partial differential equations of electromagnetism and fluid dynamics in Comsol Multiphysics 5.1 Software. As the different inflow velocities of the fluid move along the duct, they are decelerated by the applied magnetic field (1.41 T). Thereafter, the fluid flow is again studied analytically under the magnetic fields of 1.41 T and 5 T to generate electric power. From the numerical investigation, the velocity fields of the different inflow velocities along the duct length are found to decrease when the magnetic field intensity is high. Conversely, the velocity magnitude of each inflow velocity, and the pressure gradient gradually increases at the center of the duct when an electric potential was applied across the electrodes. The MHD analysis performed in this work could be used to improve the propulsion of space-ships, efficiency of railway engines and electric power generation in South Africa.


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Modelling of an MHD system to investigate an ionised gas flow inside a rectangular duct
How to Cite
AYELESO, Ayokunle O.; KAHN, Mohamed T.E.; RAJI, Atanda K.. Modelling of an MHD system to investigate an ionised gas flow inside a rectangular duct. Journal of Energy Technology Research, [S.l.], v. 1, n. 1, p. 39-52, feb. 2017. ISSN 2514-4715. Available at: <>. Date accessed: 20 jan. 2018. doi: