Double diffusive Marangoni convection flow of electrically conducting fluid in a square cavity with chemical reaction M. Saleem Department of Electrical and Computer Engineering CASE University 19 Atta Turk Avenue G 5/1 Islamabad, Pakistan Email: saleem.cfd@gmail.com M. A. Hossain Professor, Fellow Bangladesh Academy of Sciences Dhaka, Bangladesh Email: anwar@univdhaka.edu Suvash C. Saha ∗ Postdoctoral Research Fellow School of Chemistry, Physics and Mechanical Engineering Queensland University of Technology GPO Box 2434, Brisbane, QLD 4001, Australia Email: s c saha@yahoo.com ABSTRACT Double diffusive Marangoni convection flow of viscous incompressible electrically conducting fluid in a square cavity is studied in this paper by taking into consideration of the effect of applied magnetic field in arbitrary direction and the chemical reaction. The governing equations are solved numerically by using Alternate Direct Implicit (ADI) method together with the Successive Over Relaxation (SOR) technique. The flow pattern with the effect of governing parameters, namely the buoyancy ratio W, diffusocapillary ratio w, and the Hartmann number Ha, is investigated. It is revealed from the numerical simulations that the average Nusselt number decreases; whereas the average Sherwood number increases as the orientation of magnetic field is shifted from horizontal to vertical. Moreover, the effect of buoyancy due to species concentration on the flow is stronger than the one due to thermal buoyancy. The increase in diffusocapillary parameter w causes the average Nusselt number to decreases, and average Sherwood number to increase. ∗ Corresponding author: S. C. Saha, Phone: +61731381413, Email: s c saha@yahoo.com Or suvash.saha@qut.edu.au This manuscript has been accepted for publication in ASME Journal of Heat Transfer