This paper provides a numerical study of forced convection between hot and cold nanofluid laminar flows that are separated by a thin membrane, in a horizontal channel. Outer surface of channels' walls are thermally insulated and divide into two parts; namely NMP and MP. NMP is the channel's wall from the entrance section to the middle section of channel that is not influenced by magnetic field. MP is the channel's wall from the middle section to the exit section of channel which is influenced by a uniform-strength transverse magnetic field.The governing equations for both hot and cold flows are solved together using the SIMPLE algorithm. The effects of pertinent parameters, such as Reynolds number(10≤Re≤500), Hartman number(0≤Ha≤60) and the solid volume fraction of copper nano-particles(0≤?≤0.05), are studied. The results are reported in terms of streamlines, isotherms, velocity and temperature profiles and local and average Nusseltnumber.The results of the numerical simulation indicate that the increase in Reynolds number and the solid volume fraction lead to increase in Nusselt number. Meanwhile, the results also show that the rate of heat transfer between the flows increases as the Hartmann number increases, especially at higher values of the Reynolds number.
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