Examination of fluid flow in the middle of co-axial infinite rotating porous discs considering lower disk isothermal

Viscous incompressible fluid flow in the middle of two co-axial infinite rotating porous discs is being investigated. Here flow is considered time dependent. Also, fluid is being injected through lower disc which is considered for equal to rate of suction of fluid through upper disc. The discs are rotating in the planes z = 0 and z = d (t), where L and have dimensions of length and t-1, respectively and t is the time. Different angular velocities are being taken for both the discs. It is also assumed that the lower disc is isothermal. Heat transfer analysis is also being carried out in the study. Mathematical model of the problem is being solved using perturbation method to get exact solution of the problem. Results are depicted with the help of graphs and tables for fluid flow velocities as well as for temperature.