Numerical study for bioconvection transport of micropolar nanofluid over a thin needle with thermal and exponential space-based heat source

Abstract

Nanomaterials are the latest technique to upgrade thermal conduction of base liquids. The submerging of these nanomaterials in base liquid is known as nanofluid. In recent time the nanofluids are more useful in mechanical engineering, nanotechnology, bioscience, biotechnology and in many sectors. This analysis deals with the bio-convection transport of micropolar liquid containing nanomaterial's and gyrotactic motile microorganisms past a needle moving in parallel flow in occurrence of thermally radiation and activation-energy. Modeling of needle structure for bioconvection flow of micropolar nanofluid is developed. The behavior of temperature and exponential space-based heat source is considered. The boundary layer flow expressions for developed transport issue are represented by PDEs. Suitable similarity variables are used to change transport expressions in nondimensional nonlinear ordinary differential ones. The bvp4c algorithm has been used to numerically tackle dimensionless nonlinear differential equations (ODEs). All results are described by employing bvp4c tool in MATLAB. Impacts of active numbers on flow distributions are examined with sketches and tables. Temperature field and heat transfer rate are quite opposite for exponential space-based heat source sink parameter and heat sink/source parameter. The concentration of nanoparticles is reduced for larger amount of Brownian motion parameter while uplifts for thermophoresis parameter. Concentration is enriched for the growing magnitudes of thermophoresis number. Higher Peclet parameter decayed the microorganism's field.

Keywords

• Micropolar nanofluid
• Thin needle
• Thermal and exponential space-based heat source
• Arrhenius activation energy
• Bioconvection
• Numerical solution