Gurusamy Hirankumar

This study provides an analytical investigation of magnetic field‐dependent viscosity (MFD) effects on the MHD boundary‐layer flow of an incompressible, steady, laminar, two‐dimensional Casson fluid over a horizontally stretching sheet. Ohmic heating and viscous dissipation are included in the formulation, and heat transfer is examined under both prescribed heat flux (PHF) and prescribed surface temperature (PST) boundary conditions. Similarity transformations reduce the governing dimensional PDEs to a coupled system of ODEs, yielding a more tractable mathematical model. An explicit analytical expression is obtained for the momentum field, while the temperature distribution is represented through Kummer's special function. Analytical relations are also derived for the non‐dimensional wall temperature (WT), local Nusselt number (NN), and local skin friction coefficient (SF). The effects of MFD viscosity and thermal parameters are explored through the resulting velocity and temperature fields and their influence on SF and NN. The results show that an increase in the Casson parameter reduces both velocity and temperature, leading to a 7.92% decrease in the local Nusselt number, whereas increasing the magnetic viscosity, magnetic parameter, and Eckert number enhances the heat transfer rate by 12.53%, 42.16%, and 76.14%, respectively. The analytical predictions exhibit excellent agreement with established benchmark results, confirming the accuracy and reliability of the present formulation The findings are relevant to applications such as biomedical flows, polymer processing, coating technologies, and cooling systems involving magnetically controlled non‐Newtonian fluids.

The aim of this work is to study the effect of non-ionic short chain liquid polymer on the conductivity of PVA-LiClO₄ membrane. Polyethylene glycol p-tert-octylphenyl ether (Triton X-100) is used as an additive with different concentrations in PVA-LiClO₄ matrix. The conductivity of additive incorporated polymer electrolyte increases to two orders of magnitude than the pristine polymer electrolyte. The maximum conductivity is measured to be 1.92 mS/cm at ambient temperature. The conductivity enhancement is correlated with the availability of free ions as well as segmental motion of polymer chain with the aid of FTIR and Dielectric relaxation tools. DC polarization and cyclic voltammetry techniques are also carried out to check the suitability of prepared polymer electrolytes as electrolyte material for batteries.

Nanocomposite solid polymer electrolytes comprise of PMMA (poly methyl methacrylate), PVP (poly vinyl pyrolidone), MSA (methanesulfonic acid) and TiO₂ as nanofiller were prepared by solution casting technique at different compositions. Sample with 1 mol% incorporated TiO₂ has shown maximum conductivity and its value was found as 2.82 ×10^-5 S/cm. The value of conductivity has been enhanced to about 31% upon the addition of nanofiller. The relaxation time for all the prepared composites as well as for the composite having maximum conductivity at various isotherms have been calculated from the loss tangent plot. The frequency and temperature dependence of dielectric constant and dielectric loss nanocomposite solid polymer electrolytes have also been studied. The modulus analysis confirms the non-Debye type formalism in the prepared composites.