Abstract:
Numerical study on the natural convection flow of Cu-H2O nanofluid along a vertical
complex wavy surface with uniform heat flux has been carried out. The complex
surface is considered as the combination of two sinusoidal functions, a fundamental
wave and its first harmonic wave. The governing boundary layer equations are
transformed into parabolic partial differential equations by applying a suitable set of
variables. The resulting nonlinear system of equations are then mapped into a regular
rectangular computational domain and solved numerically by using an implicit finite
difference method known as Straight Forward Finite Difference (SFFD) method.
Numerical results are thoroughly discussed in terms of velocity and temperature
distributions, surface temperature distribution, skin friction coefficient and Nusselt
number coefficient for selected key parameters such as solid volume fraction of
nanofluid ( ), fundamental amplitude ( 1 a ) and harmonic amplitude ( 2 a ) of complex
wavy surface. In addition, velocity vectors, streamlines and isotherms are plotted to
visualize momentum and thermal flow pattern within the boundary layer region.
