M NAGA RAJU,V PALLAVI 02 01 The present study investigates heat transport characteristics in the bioconvective flow of a WaltersB nonNewtonian nanofluid containing gyrotactic microorganisms The inclusion of nanoparticles enhances thermal conductivity while gyrotactic microorganisms induce bioconvection significantly influencing flow stability and heat transfer performance A mathematical model is developed to describe the coupled momentum energy nanoparticle concentration and microorganism density equations governing the WaltersB fluid Appropriate similarity transformations are employed to reduce the governing partial differential equations into a system of nonlinear ordinary differential equations Numerical solutions are obtained to analyze the effects of key physical parameters such as viscoelasticity Brownian motion thermophoresis bioconvection Rayleigh number and microorganism concentration on velocity temperature and density profiles The results demonstrate that bioconvection enhances thermal transport by improving nanoparticle distribution and suppressing sedimentation effects The study provides useful insights into controlling heat transfer in nonNewtonian bionanofluid systems with potential applications in biomedical engineering microfluidic devices and advanced thermal management systems Copyright (c) Journal of Science Engineering Technology and Management Science. All rights reserved 2026