Bioconvective oscillatory flow of radiated viscoelastic nanofluids with thermophoresis and suction effects: Applications in pulsating thermal systems

Abstract

The non-Newtonian nanofluids offer important applications in advanced thermal systems by enhancing the cooling efficiency and controlling the heat transfer phenomenon. This study investigates the oscillatory bioconvective flow of viscoelastic nanofluids with suspended microorganisms, considering the influence of nonlinear radiative effects and thermophoresis under convective thermal and concentration constraints. The flow is induced by an oscillating stretched porous surface with mass suction effects, modeled through a set of time-dependent partial differential equations (PDEs). The modified Fourier and Fick theories are incorporated into the energy and concentration equations. The Homotopy Analysis Method (HAM) is employed to obtain analytical solutions, and the convergence of the method is verified through h-curve analysis. The effects of key physical parameters, including the viscoelastic fluid parameter, Hartmann number, thermophoresis coefficient, and Prandtl number, are thoroughly examined and graphically presented. It has been observed that presence of suction and porosity parameters suppresses the velocity profile while it enhances due to viscoelastic parameter. Both skin friction and Nusselt number exhibit oscillatory behavior with variations in the viscoelastic and Hartmann numbers. Additionally, thermophoretic forces reduces the concentration profiles while enhancing influence has been noticed for assessment of heat transfer and microorganism profile. These findings offer valuable insights for the optimization of pulsating thermal systems, particularly in applications involving mechanical vibrations, heat exchangers, and renewable energy systems.

Keywords

• Viscoelastic fluid
• Thermophoresis phenomenon
• Microorganisms
• Suction effects
• Oscillating stretched surface