Computation of electroconductive gyrotactic bioconvection under nonuniform magnetic field: Simulation of smart bio-nanopolymer coatings for solar energy

Abstract

The water-based bioconvection of a nanofluid containing motile gyrotactic micro-organisms (moves under the effects of gravity) over a nonlinear inclined stretching sheet in the presence of a nonuniform magnetic field has been investigated. This regime is encountered in the bio-nanomaterial electroconductive polymeric processing systems currently being considered for third-generation organic solar coatings, anti-fouling marine coatings, etc. Oberbeck–Boussinesq approximation along with ohmic dissipation (Joule heating) is considered in the problem. The governing equations of the flow are nonlinear partial differential equations and are converted into ordinary differential equations via similarity transformations. These equations are then solved by the Finite Element Method. The effect of various important parameters on nondimensional velocity, temperature distribution, nanoparticle concentration, the density of motile micro-organisms is analyzed graphically in detail. It is observed from the obtained results that the flow velocity decreases with rising angle of inclination [Formula: see text] while temperature, nanoparticle’s concentration and density of motile micro-organisms increase. The local skin friction coefficient, Nusselt number, Sherwood number, motile micro-organism’s density number are calculated. It is noticed that increasing the Brownian motion and thermophoresis parameter leads to an increase in temperature of fluid which results in a reduction in Nusselt number. On the contrary, the Sherwood number rises with an increase in Brownian motion and thermophoresis parameter. Also, interesting features of the flow dynamics are elaborated and new future pathways for extension of the study identified in bio-magneto-nano polymers (BMNPs) for solar coatings.

Numerical investigation of Von Karman swirling bioconvective nanofluid transport from a rotating disk in a porous medium with Stefan blowing and anisotropic slip effects

“…The mechanism of bioconvection can be exploited in producing ecological fuels, bio-coatings and designing fuel systems. Relevant studies include Chisti [15] on bioethanol, Satyanarayana et al [16] on PEM fuel cells [16], Aneja et al [17] on magnetic nano-bio solar collector coatings and Roncallo et al [18] on photo-bioreactors. Many numerical studies of combined nanofluid and bioconvection transport have been reported recently.…”

Unsteady bioconvective squeezing flow with higher‐order chemical reaction and second‐order slip effects

“…An excellent discussion on bioconvection patterns can be seen in the literature 12–14 . Bioconvection within nanofluids comprises the most gifted nanoplatform because such bioconvective nanoliquid flow has wide applications in the bio‐micro‐system, 15 bioreactors, 16 biochromatography, 17 magnetic bioseparation devices, 18 biosensors, 19 biocoating, 20 ecological fuels, 21 biochemical reactors, 22 and so forth. Geng and Kuznetsov 23 investigated the impression of minuscule particles on bioconvection.…”

Hall current, viscous and Joule heating effects on steady radiative 2-D magneto-power-law polymer dynamics from an exponentially stretching sheet with power-law slip velocity: A numerical study

“…Andersson et al [17] analyzed studied hydromagnetic power-law fluid over a stretching sheet, deriving exact similarity transformation, although they incorrectly computed flow acceleration with stronger magnetic field effect. Aneja and co-workers [18] employed the variational finite element method to compute the gyrotactic bioconvection in power-law magnetic flow from a tilted stretching sheet. They computed the correct response of increasing magnetic field, namely that it reduces momentum boundary layer thickness and decelerates the flow.…”