Browsing by Author "Priyanka, R."

Now showing 1 - 4 of 4

Printex-U soot oxidation kinetic behaviour over Alumina and Quartz
(Elsevier Ltd, 2022) Ganiger, S.; Patil, S.S.; Prasad Dasari, H.P.; Priyanka, R.; Kollimarla, S.
Printex-U carbon (Pure Soot, S0) on alumina (SA) and quartz (SQ) powder were considered to understand the behaviour of oxidation reaction and kinetic analysis. A similar model of the single-step reaction was followed by the Soot (S0) and SA sample, while SQ followed a complex mechanism of multiple-step reactions. From the experimental and theoretical calculations, it was observed that there was a slight decrease in the T50 temperature for SA, which also had the lowest Ea, but there was an increase in T50 and Ea for SQ compared to the S0 sample. From the present study, it can be understood that the alumina enhanced the catalytic activity when compared to pure soot alone, whereas quartz inhibited the activity. The T50 temperature, Ea, and A calculated were obtained in SA < S0 < SQ. The soot properties and their kinetics will further help to design catalyzed diesel particulate filters. © 2021 Elsevier Ltd
Stability and dynamic behavior of porous FGM beam: influence of graded porosity, graphene platelets, and axially varying loads
(Springer Science and Business Media Deutschland GmbH, 2022) Priyanka, R.; Twinkle, C.M.; Jeyaraj, J.
This paper investigates the free vibration and buckling behaviors of functionally graded graphene platelets (FG-GPLs) reinforced porous beam under axially variable loads. The internal pores and GPLs are either uniformly or non-uniformly distributed along the thickness direction. Halpin–Tsai micromechanics model is used to calculate the effective elastic modulus. The variation of Poisson’s ratio along the thickness and the relation between mass density and porosity coefficients are determined using mechanical properties of closed-cell solid under the Gaussian random scheme. The equilibrium equations are derived by Hamilton’s principles, and critical buckling load and dimensionless natural frequency are determined by Ritz formulation. Results revealed that buckling and free vibration behavior of the porous FG-GPL beam are influenced by the GPLs grading pattern and the type of axially varying load. Furthermore, the grading pattern of porosity has more influence on the buckling behavior compared to the free vibration behavior. It is also observed that buckling mode and the fundamental vibration mode of the porous FG-GPL are influenced by the loading conditions and remain unaffected by the grading pattern of porosities and GPLs. © 2021, The Author(s), under exclusive licence to Springer-Verlag London Ltd., part of Springer Nature.
Static stability and free vibration characteristics of a micro laminated beam under varying axial load using modified couple stress theory and Ritz method
(Elsevier Ltd, 2022) Priyanka, R.; Jeyaraj, J.
This paper explores the buckling and free vibration behaviors of micro laminated composite beams (MLCBs) exposed to varying axial loads using the modified couple stress theory (MCST), with arbitrary boundary conditions and layups. The size effect is captured in MCST by taking into account the material length scale parameters. In the axial direction, the applied load has either constant, linear, or parabolic variations. The equilibrium equations are derived and solved using Hamilton's principle and Ritz method respectively. The size effect is observed to be more pronounced when the thickness of the beam is similar to the material length scale parameter, and it nearly vanishes as the beam thickness increases. The small size effect variation is different for different boundary conditions. For parabolically increasing loading case, the rate of reduction of the fundamental frequency with an increase in applied load intensity is greater compared to other loadings. © 2021 Elsevier Ltd
Synthesis of Praseodymium-Doped Ceria-Based Electrolyte Material by Hydrothermal Method
(Springer Science and Business Media Deutschland GmbH, 2022) Rao, R.; Kamath, K.; Priyanka, R.; Shajahan, I.; Prasad Dasari, H.P.
Praseodymium-doped ceria (PDC)-based electrolyte powder was synthesised by the hydrothermal method. The as-synthesised powder was studied by various powder characterisations such as X-ray diffraction (XRD), Raman spectroscopy and scanning electron microscopy (SEM) analysis to find out the crystallinity, phase, nature and structural morphology. The shrinkage behaviour (linear shrinkage and shrinkage rate) of PDC powder at high temperatures was performed by dilatometer studies. The crystallographic parameters including the crystallite size, lattice strain and lattice parameter were calculated from XRD analysis. Raman spectroscopy analysis revealed the characteristic peak at 460Â cmâˆ’1 which corresponds to the F2g peak of the cubic phase of ceria and the peak at 550Â cmâˆ’1 is attributed to intrinsic oxygen vacancies that confirmed the formation of ceria praseodymium solid solution. Â© 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.