K. Vijaya Kumar Reddy

Jawaharlal Nehru Technological University, Hyderabad

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J. Suresh Kumar

Jawaharlal Nehru Technological University, Hyderabad

Ravi Gugulothu

Jawaharlal Nehru Technological University, Hyderabad

E. Ramjee

Jawaharlal Nehru Technological University, Hyderabad

Subramanyam Pavuluri

Jawaharlal Nehru Technological University Anantapur

Nadendla Srinivasababu

Vignan's Foundation for Science, Technology & Research

B. Durga Prasad

Jawaharlal Nehru Technological University Anantapur

Bipin Kumar

Dehradun Institute of Technology University

Jitender Kumar

Government Medical College and Hospital

Naga Sarada Somanchi

Jawaharlal Nehru Technological University, Hyderabad

K. Thirupathi Reddy

Bharat Heavy Electricals (India)

Cooperative Institutions

Jawaharlal Nehru Technological University, Hyderabad

Sri Venkateswara University

King Khalid University

Koneru Lakshmaiah Education Foundation

Jawaharlal Nehru Technological University Anantapur

University of Malaya

Jawaharlal Nehru Technological University, Kakinada

Kurnool Medical College

Bharat Heavy Electricals (India)

CMR University

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Experimental investigations on ternary blend mixture of diesel/neem-biodiesel/ethanol blends: Combustion, performance and emission control

AIP conference proceedings (2023)

Subramanyam Pavuluri K. Vijaya Kumar Reddy B. Durga Prasad

Neem Oil

10.1063/5.0116220

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Citations (0)

CFD Analysis of a Helically Coiled Tube in Tube Heat Exchanger

Materials Today Proceedings (2017)

K. Vijaya Kumar Reddy Bipin Kumar Ravi Gugulothu Kakaraparthi Anuja P. V. Siva Rao

10.1016/j.matpr.2017.02.083

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Citations (36)

Static Bending Behavior of Functionally Graded Plates Subjected to Mechanical Loading

B. SiddaRedddy J. Suresh Kumar K. Vijaya Kumar Reddy

This paper presents analytical formulations and solutions for the bending behavior of simply supported functionally graded plates (FGPs) using Higher Order Shear Deformation Theory (HSDT) without enforcing zero transverse shear stresses on the top and bottom surfaces of the plate. It does not require shear correction factors. Material properties of the plate are assumed to vary in the thickness direction according to a power law distribution interns of the volume fractions of the constituents. The governing equations of motion and boundary conditions are derived using the principle of virtual work. Solutions are obtained for FGPs in closed-form using Navier’s technique. The results of deflections and stresses are presented for simply supported boundary conditions. The present numerical results are compared with the available solutions in the literature for deflections and stresses, from which it can be concluded that the proposed theory results are very close agreement to the published ones. After validating the present theory results for FGM plates, the effect of side-to-thickness ratio, aspect ratio, modulus ratio, the volume fraction exponent,and through-the-thickness on the deflections and stresses are studied. The shear deformation effect and inhomogeneities played a greater role in estimating the deflctions and stress distribution in the functionally graded material plates.

Plate theory

Volume fraction

Shear modulus

Aspect ratio (aeronautics)

Virtual work

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Citations (8)

INVESTIGATIONS INTO EMMISSION CHARECTERESTICS OF LHR ENGINE USING PALM STEARN METHYL ESTER OIL WITH A MODIFIED PISTON GEOMETRY

S.Venkata Lakshmi .K. Vijaya Kumar Reddy

In this context it is learnt that the liquid fuels are more suitable fuels because of their high energy content per unit volume, easy for handling and distribution. The most suitable and available alternative fuels are alcohols and vegetable oils. Due to low cetane number, alcohols are not suitable for direct use in diesel engines. Majority of vegetable oils, having properties closer to diesel, can be used directly in existing CI engines. Vegetable oils typically have large molecules with carbon, hydrogen and oxygen being present. They have chemical structure similar to diesel fuel with different bond structure leads to higher molecular mass and viscosity. At present the market price of vegetable oils are higher than diesel. However it is anticipated that in near future the cost will be reduced as a result of developments in agricultural methods and oil extraction techniques. In the present work an attempt is made to improve the emission of CI diesel engine using Vegetable oil ester. Hence in this work palm stern methyl ester is used with a modified piston geometry and LHR using concepts. The experiments are carried out on a 4stroke single cylinder CI diesel engine of 5.2 KW. The experiments are conducted repeatedly with diesel fuel and palm stern methyl ester. Since these oils have slightly longer ignition delay, The low heat rejection engine concept is used in this work. In order to convert the base engine as LHR engine the piston crown is coated with partially stabilized zirconium PSZ of 0.5 mm thickness. From the results it is observed that the modified piston geometry with LHR engine concept has considerably given superior all round emission characteristics.

Cetane number

Piston (optics)

Vegetable oil

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Citations (1)

Effect of Injection Parameters on the Performance of Compression Ignition Engine Powered with Jamun Seed and Cashew Nutshell B20 Biodiesel Blends

Sustainability (2022)

K. M. V. Ravi Teja P. Issac Prasad K. Vijaya Kumar Reddy N. R. Banapurmath M.A. Kalam

Renewable fuels are alternative resources that find use in the power generation, agricultural, and transportation sectors. The sustainable utility of these renewable fuels mostly addresses the socio-economic issues of a country and reduces its dependency on fossil fuels. In addition, being environmentally friendly allows them to handle global warming more effectively. Two B20 fuel blends were produced using methyl esters of cashew nutshell and jamun seed oils to test the performance of the common rail direct injection engine. To improve the engine performance, injection parameters such as nozzle geometry, injection time, and injector opening pressure are used. Improved brake thermal efficiency and lower emissions of smoke, hydrocarbons (HC), carbon monoxide (CO), and nitrogen oxides (NOx) were achieved with the help of advancing the injection timing, raising the injector opening pressure, and increasing the number of injector nozzle holes. In addition to reducing the ignition delay, extending the combustion duration, and increasing the peak pressure, the revised injection settings also boosted the heat release rates. At the maximum load, compared to CHNOB B20, JAMNSOB B20 showed a significant rise in the brake thermal efficiency (BTE) by 4.94% and a considerable decrease in smoke emissions (0.8%) with an increase in NOx (1.45%), by varying the injection timing, injection pressure, and nozzle geometry of the common rail direct injection (CRDI) engine.

Thermal efficiency

Common rail

Renewable Fuels

10.3390/su14084642

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Citations (2)

Experimental study on free convective heat transfer from vertical square ducts

T. V. S. M. R. Bhushan K. Vijaya Kumar Reddy

In this paper the effect of free convection heat transfer around vertical square ducts has been studied experimentally. Inconel heating element is used to heat the duct from the center and thermocouples are mounted on each side to measure circumferential average temperature. Experiments were conducted under constant heat flux conditions. Two ducts are considered with variable side length to study the effect of area ratio. Wide range of experiments are conducted to investigate natural convection in laminar and transition regions. Regression analysis is performed and new correlations were proposed in terms of local and average non-dimensional numbers.

Thermocouple

Square (algebra)

10.1109/icctet.2014.6966355

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Citations (2)

Free vibration behavior of bi-directional functionally graded plates with porosities using a refined first order shear deformation theory

Applied and Computational Mechanics (2020)

K. Vijaya Kumar Reddy Vijaya Kumar Reddy K B. Chinna Ankanna

This paper proposes the refined first order shear deformation theory to investigate the free vibration behavior of bidirectional functionally graded porous plates. This theory satisfies the transverse shear stress free conditions at the top and bottom of the plate, thus avoids the need of a shear correction factor. The rule of mixtures is employed to compute the effective material properties and assumed to be graded in both x and z-directions. The equations of motion are derived by means of Lagrange equations to investigate the free vibration response. The displacement functions in axial and transverse directions are expressed in simple algebraic polynomial series form, including admissible functions which are used to fulfill the simply supported boundary conditions. The admissible functions are generated using Pascal’s triangle. The accuracy of the present theory is assessed with the numerical results and is confirmed by comparing with 3-D exact solutions and with other higher order theories. The influence of thickness ratios, aspect ratios, gradation indexes, type of porosity distribution and the volume fraction of porosity on the free vibration behavior of bi-directional FGPs are discussed in detail. The presented numerical results can be used as benchmark solutions to assess the various plate theories and compare with solutions obtained by other analytical and finite element methods. From the present work, it can be concluded that the present theory allows examining the vibration behavior of bidirectional porous FG plates manufactured in the sintering process.

Gradation

Plate theory

10.22059/jcamech.2020.303046.510

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Citations (7)

Energy Performance Index Analysis for Optimization of Zero Energy Building Performance Through Pulp Optimization

G. R. K. Prasad K. Vijaya Kumar Reddy Saibabu Ch

Zero-point energy

10.2139/ssrn.4875426

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A refined inverse hyperbolic shear deformation theory for bending analysis of functionally graded porous plates

Applied and Computational Mechanics (2020)

K. Vijaya Kumar Reddy Vijaya Kumar Reddy K

The modern engineering structures require the advanced engineering materials to resist the high temperatures and to provide high stiffness. In particular the functionally graded porous materials (FGPMs) introduced are expected to have these desired properties, consequently eliminating local stress concentration and de-lamination. In the present paper, a new shear strains shape function is chosen to research the bending analysis of functionally graded plates (FGPs) with uneven symmetrical, uneven asymmetrical and even distributions of porosity. The material properties of uneven porosity distributions along the thickness of the FGPs vary with cosine function. The present theory includes the influence of thickness stretching. This theory also fulfills the nullity of the shear stresses in the transverse direction on the top and bottom of the plate, thus avoids the use of a shear correction factor. The virtual displacement principle is employed to develop the equilibrium equations for porous FGPs. The Navier’s method is used to obtain the solutions of porous FGPs for simply supported (SS) conditions. The accuracy of the developed theory is established with numerical results of perfect and porous FGPs available in the open source. The transverse displacements and stress results have been reported and studied for evenly, unevenly symmetrical and unevenly asymmetrical distributions with different porosity volume fraction (PVF), thickness ratios and aspect ratios. From the numerical results it is concluded that the type of porosity distribution needs to be considered as a key factor in the optimal design of the porous FGPs.

Aspect ratio (aeronautics)

10.22059/jcamech.2020.308469.544

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Citations (2)

Individual Change Management Initiatives for better Work Life Balance

Indian Journal of Science and Technology (2011)

K. Sandhya N. Vijaya Bhaskar Choudary D. Pradeep Kumar K. Vijaya Kumar Reddy

We work to live, not live to work. When money dominates the modern life, people do not find few hours to spend on their personal life and the new generation that forms the majority part of the Indian working population, ends up with an unbalanced life. But the employee, whichever age group he/she belongs to at any cost, needs to maintain a healthy balance between his job and life. This paper discusses how an individual helps himself and how the organizations can help the individuals to maintain a healthy balance between work life and the personal life.

Work–life balance

Personal life

10.17485/ijst/2011/v4i7/30124

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Citations (2)