OICC Press International Journal of Nano Dimension 2228-5059 16 3 2025 06 01 Energy transition in bioconvective darcy-forchheimer nanofluid flow: A numerical study 10.57647/j.ijnd.2025.1603.18 EN Najmeh Hajialigol Mechanical Engineering Department, Hamedan University of Technology, Hamedan, Iran https://orcid.org/0000-0003-1654-2560 Journal Article 2025 06 01 Darcy-Forchheimer nanofluids (NF) can be utilized to develop oil recovery efficiency from oil reservoirs. Nanoparticles in the NF can aid in increasing rock permeability, reducing oil viscosity, and facilitating oil flow to wells. Unsteady Darcy-Forschheimer NF bioconvective flow with activation energy and Arrhenius chemical reaction on a permeable tensile surface was investigated. The flow equations are partial differential equations that are translated into ordinary differential equations (ODE) using suitable similarity transformations. Runge–Kutta integration with the shooting method of modified Newton–Raphson methods was used to resolve these ODEs numerically. Several graphs and tables were utilized to display how changes in the evolving parameters influence the flow fields. The result demonstrated that the unsteadiness parameter, porous medium permeability, Hartmann number, porosity parameter, and Grashof parameter increased the velocity profile, while the buoyancy ratio decreased it. Unsteadiness parameter, Hartmann number, buoyancy ratio, bioconvective Rayleigh number, Prandtl number, Eckert number, and internal heat generation raised the temperature profile. The porosity parameter, Grashof number, and radiation parameter led to a decrease in temperature profile. The unsteadiness parameter, Hartmann number, buoyancy ratio, thermophoresis, Prandtl number, and Eckert number reduced the concentration profile. The growth of the parameter of internal heat generation had almost no effect on the concentration profile. The radiation parameter and Brownian motion enhanced the concentration profile.