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 This paper numerically simulates the forced convection flow in the developing region of a parallel-plate channel partially filled with two porous substrates of equal thickness deposited at the inner walls of the channel. The major objective of the present work is to investigate the impact of several operating and design parameters on the thermal performance of the channel under consideration. The physical problem is simulated by using Darcy–Brinkman–Forchheimer model. For a prescribed amount of porous material, the current investigation discusses the comparison between inserting this entire amount at one side of the channel and inserting half of this amount at each side of the channel.