  In this paper we have studied the flow and heat transfer in a viscous fluid
by a horizontal sheet. The stretching rate and temperature of the sheet vary
with time. The governing equations for momentum and thermal energy are reduced
to ordinary differential equations by means of similarity transformation. These
equations are solved approximately by means of the Optimal Homotopy Asymptotic
Method (OHAM) which provides us with a convenient way to control the
convergence of approximation solutions and adjust convergence rigorous when
necessary. Some examples are given and the results obtained reveal that the
proposed method is effective and easy to use.
