1.0 BACKGROUND TO THE STUDY
Oscillatory flows has known to result in higher rates of heat and mass transfer, many studies have been done to understand its characteristics in different systems such as reciprocating engines, pulse combustors and chemical reactors.
The applications of variable suction and chemical reaction play important role in the design of chemical processing equipments, formation and dispersion of fog, distribution of temperature and moisture over agricultural fields and groves of fruits damage of crops due to freezing, food processing and cooling of towers. Investigation of periodic flow through a porous medium is important from practical point of view because fluid oscillations maybe expected in many magneto hydrodynamic devices and natural phenomena, where fluid flow is generated due to oscillating pressure gradient or due to vibrating walls. Consequently, Ayuba et al (2015) studied the effect of variable suction on magneto hydrodynamic couette flow through porous medium in the slip flow regime.
Joseph et al (2015) examined the problem of unsteady MHD mixed convictive oscillatory flow of an electrically conducting optically thin fluid through a planer channel filled with saturated porous medium. The effect of buoyancy, heat source, thermal radiation and chemical reaction of the fluid were taken into considerations with slip boundary condition, varying temperature and concentration. The closed-form analytical solutions are obtained for the momentum, energy and concentration equations. Chamkha (2003) studied the MHD flow of a numerical of uniformly stretched vertical permeable surface in the presence of heat generation/absorption and chemical reaction. Idowu et al (2013) studied the effect of chemical reaction on MHD oscillatory flow through a vertical porous plate with heat generation. Hady et al (2006) researched on the problem of free convection flow along a vertical wavy surface embedded in electrically conducting fluid saturated porous media in the presence of internal heat generation.