Simultaneous development of velocity and temperature distributions in a flat duct with uniform wall heating

Laminar forced‐convection heat transfer in a parallel‐plate channel (flat duct) with uniform heat flux at the walls is analyzed. The velocity and temperature distributions, both uniform at the entrance section, develop simultaneously as the fluid flows through the duct. The heat transfer results, obtained for the Prandtl‐number range of 0.01 to 50, include the Nusselt‐number variation along the channel and the wall‐temperature variation corresponding to the prescribed uniform heat flux.