Bioconvection of a Radiating Hybrid Nanofluid Past a Thin Needle in the Presence of Heterogeneous–Homogeneous Chemical Reaction

Abstract

: The photo catalytic nature of TiO_2 finds applications in medicinal field to kill cancer cells, bacteria and viruses under mild ultraviolet illumination and the antibacterial characteristic of Ag makes the composition Ag-TiO_2 applicable for various purposes. It can also be used in other engineering appliances and industries such as humidity sensor, coolants and in footwear industry. Hence, this study deals with the analysis of the effects of Magnetic field, thermal radiation and quartic autocatalysis of heterogeneous-homogeneous reaction in an electrically conducting Ag-TiO_2-H_2 O hybrid nanofluid. Furthermore, the gyrotactic microorganisms are used as active mixers to prevent agglomeration and sedimentation of TiO_2 that occurs due to its hydrophobic nature. The Mathematical model takes the form of partial differential equations with viscosity and thermal conductivity being the functions of volume fraction. These equations are converted to ordinary differential equations by using similarity transformation and are solved by RKF-45 method with the aid of shooting method. It is observed that the increase in the size of the needle enhances the overall performance of the hybrid nanofluid. Furthermore, the temperature of the hybrid nanofluid increases with the increase in volume fraction. It is observed that the friction produced by the Lorentz force increases the temperature of the nanofluid. It is further observed that the heterogeneous reaction parameter has more significant effect on the concentration of bulk fluid than the homogeneous reaction parameter.

Quartic autocatalysis of homogeneous and heterogeneous reactions in the bioconvective flow of radiating micropolar nanofluid between parallel plates

“…The results obtained through this method are validated by comparing with the results of Suleman et al, 36 Puneeth et al, 19 and Shateyi and Motsa 27 . The comparison is found to be in good agreement with the existing literature and it is tabulated in Table 1.…”

“…In view of these applications, several researchers have conducted studies on bioconvection 8–12 . The study of bioconvection due to the Stefan blowing over various surfaces, like, rotating disk, 13,14 bi‐axial stretching sheet, 15 solid rotating stretchable disk, 16 horizontal plate, 17 rotating cone, 18 thin needle, 19 and so forth, was extensively discussed by many mathematicians.…”

Applications of bioconvection for tiny particles due to two concentric cylinders when role of Lorentz force is significant

“…Nadeem et al [ 7 ] analyzed the heat transfer characteristics of hybrid nanofluid flowing over a curved surface. The nanomaterials various improved migrated phenomenon with subclass of base fluids was directed in communications Puneeth et al [ 8 , 9 ]. These continuations on the analysis of heat transfer of single-phase and double phase nanofluid were extended to ternary nanofluid by Manjunatha et al [ 10 ] which comprises of a base fluid and three different classes of nanoparticles.…”

Analysis of multilayer convective flow of a hybrid nanofluid in porous medium sandwiched between the layers of nanofluid

“…Suresh et al 24 experimentally studied the heat transfer of hybrid nanofluid and observed an enhancement in the friction coefficient and Nusselt number for the case of hybrid nanofluid. Puneeth et al 25 discussed the heat transfer of hybrid nanofluid past a thin needle in the presence of quartic autocatalysis. Labib et al 26 analyzed the effect of particle concentration and Reynolds number on the heat transfer performance in hybrid nanofluids.…”