Abstract
The effects of ramped wall temperature, rotation and porosity on mixed convection flow of incompressible second grade fluid are studied. The momentum equation is modelled in a problem of rotating fluid with constant angular velocity subjected to initial and oscillating boundary conditions. The energy equation is also introduced. Some suitable non-dimensional variables are used to write equations into non-dimensional form. Laplace transform method is used to obtain the analytical solutions of these equations for variables velocity and temperature. The effect of second grade fluid parameter, rotation parameter, porosity parameter, Prandtl number and Grashof number on the fluid flows are presented graphically and analysed. It is found that, for larger values of porosity parameter, the fluid velocity will increase for both primary and secondary velocities. The results also show that, velocity for ramped wall temperature is lower compared to isothermal temperature. The exact solutions obtained in present communication can be applied for verifing of the results obtained through numerical schemes.