Bioconvection flow of Casson nanofluid by rotating disk with motile microorganisms

This paper presents the bioconvection flow of Casson nanofluid by a rotating disk with gyrotactic microorganisms, multiple slips, and thermal radiation. The non-Newtonian fluid (Casson fluid) in the existence of thermophoretic and Brownian diffusion effects is incorporated. The research of rotatable disk has practical applications in numerous processes like rotating machinery, lubrication, computer storage devices, oceanography, crystal growth, etc. Using appropriate variables, a system of strongly non-linear PDEs is translated into a system of ODEs. To construct a numerical solution of nonlinear flow equations, the bvp4c technique is used. The impacts of various numbers on velocities, thermal field, the volumetric concentration of nanoparticles, and microorganism field are investigated. From the results, it can be noticed that radial velocity rises by varying values of mixed convection parameter. An increase in bioconvection Rayleigh number causes decays in velocity fields. A larger Prandtl number declines the temperature distribution. Furthermore, an increment in the estimations of thermophoresis parameter increases the thermal and solutal field of species. Significant heat transfer is acquired with higher radiation effects. Slip parameter for temperature and concentration decreased the thermal and solutal profiles. The microorganisms field is declined with greater microorganisms slip parameter. (c) 2021 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).