Journal of Applied Mathematics
Volume 2012 (2012), Article ID 781845, 12 pages
Research Article

Unsteady Stagnation Point Flow and Heat Transfer over a Stretching/Shrinking Sheet with Suction or Injection

1Department of Mathematics, Universiti Putra Malaysia, Selangor, 43400 Serdang, Malaysia
2Institute for Mathematical Research, Universiti Putra Malaysia, Selangor, 43400 Serdang, Malaysia

Received 29 February 2012; Accepted 12 April 2012

Academic Editor: Srinivasan Natesan

Copyright © 2012 M. Suali et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The unsteady stagnation point flow and heat transfer over a stretching/shrinking sheet with suction/injection is studied. The governing partial differential equations are converted into nonlinear ordinary differential equations using a similarity transformation and solved numerically. Both stretching and shrinking cases are considered. Results for the skin friction coefficient, local Nusselt number, velocity, and temperature profiles are presented for different values of the governing parameters. It is found that the dual solutions exist for the shrinking case, whereas the solution is unique for the stretching case. Numerical results show that the range of dual solutions increases with mass suction and decreases with mass injection.