Hydromagnetic couple-stress nanofluid flow over a moving convective wall: OHAM analysis

• Published in: Acta astronautica 2016-12, Vol.129, p.271-276
• Main Authors: Awais, M., Saleem, S., Hayat, T., Irum, S.
• Format: Article
• Language: English
• Subjects: Aerodynamics; Boundary layers; Brownian motion; Computational fluid dynamics; Convective boundary conditions; Cooling; Cooling effects; Differential equations; Error analysis; Fluid flow; Fluid mechanics; Heat conductivity; Magnetism; Magnetohydrodynamics; Mathematical models; Motion effects; Moving walls; Nanofluids; Newtonian fluids; Non-Newtonian nanofluid; Nonlinear analysis; Nonlinear dynamics; Nonlinear equations; Optimization; Partial differential equations; Process parameters; Streamlines; Stress; Stresses; Thermophoresis
• ISSN: 0094-5765; 1879-2030
• DOI: 10.1016/j.actaastro.2016.09.020

This communication presents the magnetohydrodynamics (MHD) flow of a couple-stress nanofluid over a convective moving wall. The flow dynamics are analyzed in the boundary layer region. Convective cooling phenomenon combined with thermophoresis and Brownian motion effects has been discussed. Similarity transforms are utilized to convert the system of partial differential equations into coupled non-linear ordinary differential equation. Optimal homotopy analysis method (OHAM) is utilized and the concept of minimization is employed by defining the average squared residual errors. Effects of couple-stress parameter, convective cooling process parameter and energy enhancement parameters are displayed via graphs and discussed in detail. Various tables are also constructed to present the error analysis and a comparison of obtained results with the already published data. Stream lines are plotted showing a difference of Newtonian fluid model and couplestress fluid model. •Boundary layer flow of nanofluid over a stretching surface in the presence of convective cooling phenomenon is examined.•The convective cooling process occurs at the boundary has a major role in energy augmentation.•Mass fraction phenomenon can be increased by applying the magnetic field in the normal direction.•Brownian motion enhances the nanoparticles movement which results in an increase in thermal conductivity.