Growth behavior of the weakly interacted laminar MHD flow in the entrance region of a plane channel with electrically conducting walls is investigated by the momentum integral method. In the developing region, the analysis shows that, with moderate magnetic Reynolds number, the nonuniformity of the magnetic field is found to be significant, and the effect of wall conductivity is found to shorten the growth history of the flow field. Numerical results, including local pressure gradient and skin-friction coefficient, are obtained over a range of Hartmann numbers of 0–10, and wall conductance parameter γ, defined as σwh/σa, of 0–20.

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