Numerical analysis of oblique stagnation point flow of nanofluid over a curved stretching/shrinking surface
M. Riaz Khan
Abstract
Abstract This work analyses the heat transfer characteristics and the flow properties for two-dimensional oblique stagnation point flow of viscous, incompressible nanofluid over a curved stretching/shrinking surface. The nanofluid mixture is prepared by suspending the nanoparticles <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msub> <mml:mrow> <mml:mi mathvariant="normal">Al</mml:mi> </mml:mrow> <mml:mrow> <mml:mn>2</mml:mn> </mml:mrow> </mml:msub> <mml:msub> <mml:mrow> <mml:mi mathvariant="normal">O</mml:mi> </mml:mrow> <mml:mrow> <mml:mn>3</mml:mn> </mml:mrow> </mml:msub> </mml:math> into the base fluid water. The governing equations are transformed into a non-linear coupled differential equation and are solved through bvp4c function in MATLAB. The assessment of the present result confirms that the addition of nanoparticles in base fluid strengthens the drag force and lowers the heat transfer rate at the surface. For stable solution, the skin friction coefficient is maximum on the flat surface as compared to the curved surface though the rate of heat transfer is same both over a flat surface and curved surface, however, for the unstable solution it is higher over the flat surface compared to the curved surface. Moreover, the increment of shrinking strengthens the drag force and lowers the heat transfer rate at the surface.