Pallavarapu Lakshminarayana

Pharmaceutical delivery, microelectronics, fuel cell membranes, water purification, crackresistant coatings, thermal energy plants, catalysts, micro-capacitors, and car cooling systems all benefit from developments in nanotechnology. In each of these applications, ethylene glycol performs exceptionally well. The effects of a ternary hybrid nanofluid (C₂H₆O₂/CuO, TiO₂, Ag) on a rotating stretching sheet, including Darcy-Forchheimer, stagnation, radiation, and Soret-Dufour (Cross-Diffusion), were analysed using the Williamson fluid model. Using appropriate similarity transformations, the set of partial differential equations (PDEs) governing the model is first transformed into a set of ordinary differential equations (ODEs). The “bvp4c” boundary-value problem solver in MATLAB is then used to numerically solve the equations. Additionally, tables and visuals are used to display the results of parameters affecting the flow. The variations in the temperature, concentration, and velocity fields arising from radiation, cross-diffusion, and Darcy-Forchheimer processes are succinctly described in this paper. As the Darcy-Forchheimer and magnetic parameters increase with temperature, the primary velocity decreases while the secondary velocity increases. In the current investigation, the fluid's thermal efficiency increases by 8.92% with the inclusion of these nanoparticles.

This research focuses on an innovative investigation of the simultaneous peristaltic ciliary motion of Casson fluid within a porous channel, given its applications in blood rheology, mucociliary clearance, and targeted drug delivery. Even though peristaltic and ciliary motions have been well-studied individually, the coupled influence of both on top of multiple physical and physiologic effects remains unexamined. Model characteristics include the impact of an inclined magnetic field, electroosmosis, porous-medium resistance, buoyancy, viscous dissipation, radiation, and an internal heat source, as well as homogeneous-heterogeneous biochemical reactions. Using approximations for long wavelengths and low Reynolds numbers, the nonlinear equations are solved analytically via a homotopy perturbation method. Results show that increasing the Casson parameter decreases core velocity, as observed for higher-yield-stress blood-like fluids, and that increasing homogeneous reaction variables decreases solute concentration. The Brinkman number increases both the temperature and the heat transfer. Elevated Darcy numbers reduce the porous medium’s resistance, thereby lowering skin friction. This study is unique in integrating the peristaltic and ciliary mechanisms within magneto-thermal and electroosmotic effects, providing essential insights into microvascular blood flow modeling, controlled drug transport, and bio-inspired microfluidic pump design.

Enhancing engine efficiency, augmenting energy production in solar thermal systems, and reducing friction and wear in tribological contexts are key applications of ternary hybrid nanofluids comprising aluminium oxide, copper, and molybdenum disulfide nanoparticles dispersed in engine oil. This study presents a comparative analysis of the induced magnetic field and heat transfer characteristics of Carreau nanofluid flow over a vertical and an inclined stretching cylinder, highlighting the effects of thermal radiation, viscous dissipation, and stagnation point flow. The research formulates governing equations based on momentum, magnetic induction, and energy principles, converting them into nonlinear ordinary differential equations using appropriate transformations. The bvp4c solver in MATLAB is used to solve the linearised ordinary differential equations. The results indicate that the heat source/sink, magnetic field, thermal radiation parameter, and Eckert and Biot numbers contribute to enhancing the heat transfer. Ternary hybrid nanofluids excel in heat transfer and fluid motion compared to conventional nanofluids. Skin friction and local Nusselt number are computed and graphically represented for a vertical cylinder in comparison to an inclined cylinder.

Growing expectations for superior engine performance, fuel efficiency, and durability are fueling innovation in advanced heat transfer fluids and tribological technologies, aimed at reducing friction and wear, and enhancing overall efficiency in automotive and lubrication engineering. This study examines stagnation-point flow of ternary hybrid nanofluids around a horizontal stretching cylinder, accounting for the effects of a porous medium, Joule heating, a heat source/sink, thermal diffusion, and molecular motion on fluid velocity, heat transfer, and mass transfer. Similarity transformations are used to convert a system of partial differential equations (PDEs) into a system of nonlinear ordinary differential equations (ODEs), which are then reduced to first-order ODEs. The MATLAB bvp4c solver is utilized to numerically resolve the converted ODEs, yielding graphical representations of velocity, temperature, and concentration profiles. The findings reveal that the Eckert and Biot numbers, magnetic field strength, heat source/sink, thermal diffusion, and molecular motion parameters collectively enhance thermal efficiency in ternary hybrid nanofluids by 26.62% over the nanofluid. Conversely, porosity and curvature parameters are found to deteriorate thermal efficiency. Furthermore, the magnetic field, porosity, and curvature parameters are observed to augment the velocity of the ternary hybrid nanofluid.