COMPUTATIONAL ANALYSIS OF SORET AND DUFOUR EFFECTS ON MAGNETOHYDRODYNAMIC THERMO-SOLUTAL FLOW OF AN OLDROYD-B NANOFLUID FROM A STRETCHING SHEET

Abstract

The present study provides a theoretical and computational interpretation of Dufour and Soret effects on the magnetohydrodynamic flow of an Oldroyd-B nanofluid over a stretching sheet, motivated by magnetic polymer manufacturing processes. Buongiorno's two-component nanofluid model creates foundation for the analysis. Using similarity transformations, the governing equations for coupled thermal-mass transport, cross-diffusion, and viscoelastic behavior are converted into a system of ordinary differential equations. The bvp4c solver in MATLAB is used to numerically solve these resulting equations. According to the findings, a thicker momentum boundary layer and improved heat retention result from increasing the magnetic parameter, which decreases velocity due to resistive Lorentz force. While an increase in Deborah number stabilizes the flow, a higher elasticity of the non-Newtonian nanopolymer suppresses velocity. The Dufour effect, which increases heat transfer, and the Prandtl number, which decreases the thickness of the thermal boundary layer when raised, have a major impact on thermal transport. Thermophoresis and Brownian motion both raise thermal conductivity, which raises the Nusselt number. The results are asymptotically well-behaved and their accuracy is validated numerically. These findings have practical applications in magnetic nano-polymer processing and electromagnetic nano-coating flow manufacturing.