G. Swamy Reddy

This study investigates the influence of chemical species on magnetized bioconvection flow of a viscous nanofluid over a stretching curved surface. The analysis incorporates the effects of Brownian motion, Thermophoresis, Thermal radiation, and internal heat generation/absorption. Convective thermal and solutal boundary conditions are imposed to examine heat and mass transport characteristics. Appropriate similarity transformations are employed to convert the governing partial differential equations into a system of nonlinear ordinary differential equations, which are then solved numerically using the BVP4C scheme. The results indicate that an increase in the magnetic field parameter significantly suppresses the velocity gradient due to the Lorentz force. Moreover, simultaneous enhancement of thermal radiation and Brownian motion parameters leads to a pronounced rise in the temperature distribution. The concentration gradient is found to increase with higher values of the solutal Biot number and Brownian motion parameter. Additionally, the local density number, Nusselt number, and Sherwood number are computed and analyzed. A comparative assessment with previously published results in limiting cases is presented, demonstrating excellent agreement and validating the accuracy of the numerical methodology. This study presents a novel unified numerical framework that simultaneously incorporates bioconvection, magnetohydrodynamics, thermal radiation, and thermo-solutal effects over a curved surface, addressing the lack of comprehensive analyses of these coupled phenomena in existing literature. The findings provide new insights into the interaction between curvature, magnetic fields, heat transfer, mass transfer, and microorganism dynamics. The proposed model has potential applications in biomedical engineering, bio-reactors, solar thermal systems, microfluidic devices, and advanced heat and mass transfer technologies.

Hybrid nanofluids (HNFs) have become important for improving heat transfer in various engineering fields, especially in rotating cylinders, energy conversion systems and efficient heat exchangers. Motivated by the need to elevate heat transfer efficacy, this research explores the thermal transport behavior of a hydromagnetic HNF composed of methanol enriched with nanoparticles coursing over a stretchable cylindrical surface. The flow regime is defined by the inclusion of viscous and Joule heating, linear thermal radiation and slip-flow phenomena, governed by velocity slip and temperature jump conditions (Smoluchowski) at the boundary. The model also integrates the role of variable electrical conductivity, dynamic viscosity and thermal conductivity, critical factors inspired by their real-world relevance in temperature-sensitive microfluidic systems, energy-efficient thermal insulation and smart fluidic cooling technologies. The nonlinear partial differential equations were converted into ordinary differential equations (ODEs) through similarity transformations, then solved with the reliable fourth-order Runge–Kutta method and a shooting technique. Graphical insights elucidate how key parameters such as thermal radiation intensity, viscous heating and boundary slip phenomena intricately influence velocity and temperature fields. Notably, enhanced fluid momentum is associated with higher Maxwell slip and Reynolds numbers, while elevated Eckert and radiation parameters amplify thermal diffusion. Quantitatively, the wall shear stress exhibits a 23.6% reduction with increasing magnetic parameter (M) and a 17.8% decrease under suction enhancement (S), while HNFs outperform conventional nanofluids in drag reduction. The HNF achieves a Nusselt number (Nu) that is up to 8.71% higher than the conventional Nanofluid (NF) at [Formula: see text], confirming its superior heat transfer capability. Validation against established benchmark scenarios confirms the robustness and accuracy of the numerical formulation. This study is vital for advancing magnetic-assisted thermal regulation and thermal energy storage solutions in high-performance engineering systems where precise thermal control is critical for operational efficiency.