Abstract
An incompressible fluid of constant thermal diffusivity flows with velocity
Sy
in the
x
-direction over the infinite plane wall
y
= 0. The half-plane
y
= 0,
x
> 0 is maintained at a uniform temperature
T
1
greater than the temperature
T
0
of the oncoming fluid. The adiabatic boundary condition
T
y
= 0 is imposed on the half-plane
y
= 0,
x
< 0. An exact solution for the dimensionless heat transfer from the heated half-plane
x
> 0, incorporating longitudinal diffusion, is obtained by the Wiener-Hopf technique, and is reduced to a single convergent real integral which is evaluated numerically. An asymptotic expansion is made in inverse powers of
x
, whose leading term is Lévêque’s (1928) boundary-layer solution. Subsequent terms in the expansion lead to a determination of the coefficients of the eigenfunctions of the boundary-layer equations which would remain arbitrary in a direct asymptotic expansion of the governing equation.
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