Abstract
Heat transfer in turbulent flow between parallel plates is solved by matched asymptotic expansion technique for the case of uniform wall temperature, and the Nusselt number and the thermal entry lengths are determined over a wide range of Reynolds and Prandtl numbers. Simple analytical expression is presented for the asymptotic Nusselt number. A comparison of the asymptotic Nusselt number for parallel plates in the range 0.004 < Pr < 0.1 with that obtained from a circular tube solution based on the equivalent diameter shows that circular tube results if applied for parallel plates overestimate the Nusselt number from 13 to 35% depending upon the Prandtl and Reynolds numbers.
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