Analysis of entropy generation in nonlinear convection flow of unsteady magneto-nanofluid configured by vertical stretching sheet with Ohmic heating

Abstract

As a new kind of heat transfer liquid, nanofluids may be thought of as an efficient medium for increasing energy transmission. The concept of energy enhancement via nanofluids is covered in this study. Copper (Cu), copper oxide (CuO), aluminium oxide (Al₂O₃), and titanium dioxide (TiO₂) are the forms of water-based nanofluids that are considered to examine the impact of entropy generation analysis on the unsteady nanofluid flow and heat transfer across a vertical plate with the influence of viscous dissipation. The nonlinear temperature density relation is implemented to address thermal transport issues. By appropriate similarity conversion, the leading equations are transformed into their dimensionless form. The successive linearisation (SL) technique plus the Chebyshev collocation method is employed to solve the dimensionless equations. Effects of emerging parameters are graphed on the profiles of skin friction, Nusselt number, entropy generation, temperature and velocity while the error plot is demonstrated to assess the method's quick convergence characteristics. The result shows that by adjusting the convection parameter, the skin drag fast declines for Cu-water-based nanofluid. However, the heat transfer rate increases in the absence of a convection parameter. Further, the entropy generation rate is boosted as the Reynolds number and volume fraction parameter.

KEYWORDS:

• Nonlinear convection
• unsteady nanofluid flow
• entropy generation
• successive linearisation technique
• Chebyshev collocation method
• Ohmic heating

Disclosure statement

No potential conflict of interest was reported by the author(s).