Non-similar analysis of the Cattaneo-Christov model in MHD second-grade nanofluid flow with Soret and Dufour effects

Abstract

Influences of Soret (thermo-diffusion) and Dufour (diffusion-thermo) effects for MHD second grade nanofluid flow by a stretchable Riga surface is investigated. The Cattaneo-Christove (CC) method is used to predict heat and mass transport. Thermal radiation and thermal solutal stratification effects are taken into account. Heat generation, mixed convection, thermophoresis and Brownian motion effects are included. Temperature-dependent thermal conductivity and concentration-dependent mass diffusivity are adopted. Formulation for non-similar analysis is organized. Optimal homotopy analysis (OHAM) approach is used to compute solutions of resulting problems. Average square residual error (TSRE) is calculated. Outcomes of influential variables on interesting quantities are outlined. Velocity enhances for higher values of buoyancy parameter and mixed convection parameters. Temperature decays is noted for stratification parameter but opposite result observed for Dufour number.

Keywords

• Second grade (2nd) fluid
• Cattaneo-Christov (CC) model
• Soret-Dufour impacts
• Thermal and solutal stratifications
• Entropy optimization