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Feasibilty of Wind-Solar Hybrid System for Cleveland, Ohio, USA

Smart Grid and Renewable Energy 2011年第1期2卷 37-44页

作者： rama subba reddy gorla Rashid Salako 不详

The most promising and most feasible application of solar-wind hybrid energy is in the area of space and service water heating. Since these heating processes require only moderate temperatures, they can be easily achieved by the use of low-cost flat-plate collectors and low cut-in wind turbines. As the heating of buildings and provision of hot water account for a very significant percent of the total energy consumption in Cleveland, the diversion of these energy demands to solar-wind hybrid energy would result in a substantial relief of our dependence on fossil fuels and other forms of energy resources.

关键词： Smart Metering WiMAX Smart Grid Demand Response Electric Vehicles

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Natural Convective Boundary Layer Flow over a Horizontal Plate Embedded in a Porous Medium Saturated with a Nanofluid

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Journal of Modern Physics 2011年第2期2卷 62-71页

作者： rama subba reddy gorla Ali Chamkha 不详

A boundary layer analysis is presented for the natural convection past a horizontal plate in a porous medium saturated with a nano fluid. Numerical results for friction factor, surface heat transfer rate and mass transfer rate have been presented for parametric variations of the buoyancy ratio parameter Nr, Brownian motion parameter Nb, thermophoresis parameter Nt and Lewis number Le. The dependency of the friction factor, surface heat transfer rate (Nusselt number) and mass transfer rate on these parameters has been discussed.

关键词： Natural Convection Porous Medium Nanofluid

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Transient Combined Convective Heat Transfer over a Stretching Surface in a Non-Newtonian Nanofluid Using Buongiorno’s Model

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Journal of Applied Mathematics and Physics 2016年第2期4卷 443-460页

作者： rama subba reddy gorla Buddakkagari Vasu Sadia Siddiqa Department of Mechanical Engineering University of Akron Akron OH USA Department of Mathematics Motilal Nehru National Institute of Technology Allahabad India Department of Mathematics COMSATS Institute of Information Technology Attock Pakistan

The present paper investigates the transient mixed convective boundary layer flow of an incompressible non-Newtonian quiescent nanofluid adjacent to a vertical stretching surface. The effects of the Brownian motion and thermophoresis are included for the nanofluid. Using appropriate non-similarity transformations the non-dimensional, coupled and highly non-linear system of equations is solved numerically using the efficient Keller-box implicit finite difference method for the whole transient from t=0 (initial state) to (final steady-state flow). The box method is unconditionally stable. Numerical results for dimensionless velocity (f’), micro-rotation (g), temperature (θ), nanoparticle volume fraction (Φ) at final steady state flow, skin friction function (), Nusselt number function () and Sherwood number function () have been presented on various parameters inform of tables and graphs. The results indicate that as Nb and Nt increase, the Nusselt number decreases whereas Sherwood number increases at initial and early state time but decreases at the final steady state time. As the K increases, the friction factor decreases whereas surface mass transfer rate and the surface heat transfer rates slightly increase. The results reveal that there is a smooth transition of flow from unsteady state to the final steady state. A special case of our results is in good agreement with an earlier published work. The study has many practical applications such as extrusion of plastic sheets, paper production, glass blowing, metal spinning and drawing plastic films.

关键词： Nanofluid Mixed Convection Non-Newtonian Fluid Brownian Motion Keller–Box Numerical Method Boundary Layers

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Low velocity impact studies of E-glass/epoxy composite laminates at different thicknesses and temperatures

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Defence Technology（防务技术） 2019年第6期15卷 897-904页

作者： T.Sreekantha reddy P.rama subba reddy Vemuri Madhu Defence Metallurgical Research Laboratory

Low velocity impact experiments were carried out on E-glass/epoxy composite laminates having varying thicknesses at sub zero and elevated temperatures using hemi spherical steel impactor of 16 mm diameter with impact energies in the rage of 50-150 *** performance of the laminates was assessed in terms of energy absorption,maximum displacement,peak force and failure *** indicated that the effect of temperature on energy absorption of the laminate is negligible although the laminates are embrittling at sub zero *** it has influence on failure behaviour and *** force has increased linearly with increase in laminate thickness from 5 to 10 *** it got reduced by 25% when temperature was increased from-20℃ to 100℃,Based on experimental results,laminate perforation energies were predicted using curve fitting *** analysis was carried out using Taguchi method to identify the global effects of various parameters on laminate performance and confirmed that the laminate thickness has significant influence as compared to temperature,for the studied range.

关键词： Laminates Glass fibres Impact behaviour Delamination

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Development of cost effective personnel armour through structural hybridization

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Defence Technology（防务技术） 2020年第6期16卷 1089-1097页

作者： P.rama subba reddy T.Sreekantha reddy I.Srikanth Juhi Kushwaha V.Madhu Defence Metallurgical Research Laboratory Hyderabad500058India Advanced Systems Laboratory Hyderabad500058India

The objective of the present study is to develop cost effective thermoplastic hybrid laminate using Dyneema®HB50 and Tensylon®HSBD 30A through structural hybridization *** having 20 mm thickness were fabricated and subjected to 7.6239 mm mild steel core projectile with an impact velocity of 730±10 ms*** such as energy absorption,back face deformation and rate of back face deformation were measured as a function of hybridization *** was observed that hybrid laminate with 50:50 ratio(w/w)of Tensylon®and Dyneema®with Tensylon®as front face showed 200%more energy absorption when compared to 100%Tensylon®laminate and showed equal energy absorption as that of expensive 100%Dyneema®***,hybrid laminate with TD50:50 ratio showed 40%lower in terms of final back face deformation than Dyneema®*** of back face deformation was also found to be slow for hybrid laminate as compared to Dyneema®*** mechanical analysis showed that,Tensylon®laminate has got higher stiffness and lower damping factor than Dyneema®and hybrid *** interface between Tensylon®and Dyneema®layers was found to be separating during the penetration process due to the poor interfacial *** behaviour of laminates for different hybridization ratios were studied by sectioning the impacted *** was observed that,the Tensylon®laminate has undergone shear cutting of fibers as major failure mode whereas the hybrid laminate showed shear cutting followed by tensile stretching,fiber pull out and *** inputs are highly useful for body armour applications to design cost effective armour with enhanced performance.

关键词： Dyneema® Tensylon® Hybrid laminate Ballistic impact Energy absorption Back face signature

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