International Journal of Applied Engineering Research ISSN 0973-4562 Volume 13, Number 18 (2018) pp. 13919-13931 © Research India Publications. http://www.ripublication.com 13919 On three Dimensional Oscillating Flow of Magneto-micropolar Fluid Past an Inclined Plate with Radiation Absorption, Chemical Reaction and Heat Generation Sanjib Sengupta 1 and Reshmi Deb 2 Department of Mathematics, Assam University, Silchar, India. Abstract The aim of the present paper is to investigate the effect of heat generation and thermal radiation on the three dimensional free convective heat and mass transfer flow of an incompressible, magnetohydrodynamic (MHD) micropolar fluid over an inclined oscillating porous plate in the presence of first-order chemical reaction. The governing dimensionless equations are solved analytically by using perturbation technique. The effects of the governing physical parameters like chemical reaction, thermal radiation, magnetic field parameter, vortex viscosity parameter, suction parameter on the velocity, temperature and concentration fields are discussed in terms of graphs and tables. The results reveal that, the concentration profile decreases as the value of chemical reaction parameter increases, while an opposite trend is observed for linear velocity profile. It is also observed that both the linear velocity and temperature profile is in increasing trend due to rise in the values of radiation absorption parameter. A comparative analysis ensures that the skin frictional effect is less in micropolar fluid than the corresponding Newtonian fluid. Keywords: MHD Micropolar fluid, thermal radiation, radiation absorption, chemical reaction, heat generation. INTRODUCTION Micropolar fluids constitute an important branch of the micromorphic fluid theory. Micropolar fluids are fluids with microstructure belonging to a class of fluids non-symmetrical stress tensor. In micropolar fluids, rigid particles in a small volume element can rotate about the centroid of the volume element. The micro polar fluids include colloidal fluids ferro liquids, polymers with suspensions animal blood and synovial fluid which consists of a long chain of polymers that flows in the cartilage of the matching bones of animal joints. The concept of micropolar fluid was first developed by Eringen [6]. In the works of Eringen [7] and Lukaszewicz [14] many interesting aspects of micropolar fluid theory are found. Qasim et al. [19] studied the effect of heat transfer in a micropolar fluid over a stretching sheet with Newtonian heating. Sengupta and Deb [24] recently studied free convection heat and mass transfer flow of micropolar fluid in porous media with fluctuating wall temperature. The study of magnetohydrodynamics (MHD) has important applications found in metrology, planetary magnetospheres, solar physics and in motion of the earth’s core. MHD flow may be used to find solution of problems such as cooling of nuclear reactors by liquid sodium and induction flow meter, which depends on the potential difference in the fluid in the direction perpendicular to the motion and to the magnetic field. Ganesan and Palani [8] applied finite difference technique on unsteady natural convection MHD flow past an inclined plate with variable surface heat and mass flux. Kim [12] studied heat and mass transfer effect in MHD micropolar flow over a vertical moving porous plate in a porous medium. Ahmed et al. [2] analyzed the MHD free convection mass transfer flow past an oscillating plate embedded in a porous medium with Soret effect. Sengupta [26] conducted modeling with applications on heat and mass transfer phenomena in MHD flow. Yadav et al. [31] made numerical analysis of MHD flow of viscous fluid between parallel porous bounding walls. In recent period, the importance of radiative transfer in industrial and technological field have attracted the attention of many researchers in view of its applications in developments of hypersonic flights, missile re-entry rocket combustion chambers, gas cooled nuclear reactors and power plants for inter planetary flight. The significance of radiative heat transfer is found especially in electronics equipment and many processes in industry, which occur at very high temperatures. The effect f radiation on unsteady free convection flow bounded by an oscillating plate with variable wall temperature were examined by Pathak et al. [17]. Hayat and Qasim [10] considered the effect of thermal radiation on unsteady MHD flow of a micropolar fluid with heat and mass transfer. Oahimire and Olajuwon [15] studied the effects of radiation absorption and thermo-diffusion on MHD heat and mass transfer flow of a micro-polar fluid in the presence of a heat source. Sengupta [22] carried out study on free convective chemically absorption fluid Past an impulsively accelerated plate with thermal radiation variable wall temperature and concentrations. Gul et al [9] studied the effect of thermal radiation on heat transmission in the liquid flim flow of micropolar fluid in a porous medium over a stretching sheet. In many chemical engineering processes, chemical reactions take place between a foreign mass and the working fluid