The results of a numerical investigation of internal laminar heat transfer to a gas with temperature-dependent properties are reported. In this investigation the authors obtained numerical solutions to the coupled partial differential equations of continuity, energy, momentum, and integral continuity describing the two-dimensional flow of perfect gas between heated parallel plates. A sequence of numerical solutions was obtained for the case of constant wall heat flux with a fully developed velocity profile at the start of the heated section and pure forced convection. The results may be summarized by  
Nu=Nuconst.prop.
 
+0.024(Q+)0.3(Gzm)0.75
 
f·Rem=24(Twall/Tbulk)
where the subscript “m” refers to properties evaluated at the local mixed-mean (or bulk) temperature.
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