Abstract
Abstract A general pertubation method for the analysis of the effect of Prandt1 number (Pr) on the steady state heat transfer across laminar incompressible boundary layer is proposed. The method is applied to the heat transfer of a rotating disk with step discontinuity of temperature. The method is a combination of coordinate pertubation to deal with the step discontinuity of temperature and parameter ( Pr 1 3 ) perturbation to study the effect of Prandt1 number on heat transfer. The zero-order solution is the Lighthill solution. The coefficients are universal functions. The convergence is satisfactory for Pr ≥ 1.
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