Articles written in Sadhana

    • Adaptive finite element analysis with quadrilateral elements using a newh-refinement strategy

      C S Krishnamoorthy S Mukherjee

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      The theory and mathematical bases ofa-posteriori error estimates are explained. It is shown that theMedial Axis of a body can be used to decompose it into a set of mutually non-overlapping quadrilateral and triangular primitives. A mesh generation scheme used to generate quadrilaterals inside these primitives is also presented together with its relevant implementation aspects. A newh-refinement strategy based on weighted average energy norm and enhanced by strain energy density ratios is proposed and two typical problems are solved to demonstrate its efficiency over the conventional refinement strategy in the relative improvement of global asymptotic convergence.

    • Enhancement of thermal performance of engine coolant using silica nanoparticles


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      The impact of introducing SiO2 nanoparticles on the thermal conductivity (TC) values of various basefluids is presented in this paper. Microstructural properties of SiO2 nanoparticles were investigated using transmission electron microscope. Nanofluids were produced by dispersing SiO2 nanoparticles in water andcommercialized engine coolant (CEC) at different mass concentrations in a range of 0.01–1%. Dynamic light scattering, visual examination, absorbance in the visible region, and zeta (ζ) potential analysis were introduced to investigate the size distribution and stability of nanoparticles in the dispersed phase. The results show that nanofluids had good dispersion stability. Enhancement in the TC of nanofluids was improved by increasing mass concentration and temperature. The TC improvement was more in CEC than in water. The highest enhancements in TC values of nanofluids were 21.08% and 1.89% with CEC and water respectively at a mass concentration of 1% and temperature of 65 °C. Finally, a new correlation of nanofluids TC has been proposed.

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