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Papers by ravikumar kumar

Research paper thumbnail of Heat transfer and thermal analysis in a semi-spherical fin with temperature-variant thermal properties: an application of Probabilists’ Hermite collocation method

Waves in Random and Complex Media

Research paper thumbnail of Study of thermal variation in a longitudinal exponential porous fin wetted with TiO2−SiO2/ hexanol hybrid nanofluid using hybrid residual power series method

Case Studies in Thermal Engineering

Research paper thumbnail of Significance of thermal stress in a convective-radiative annular fin with magnetic field and heat generation: application of DTM and MRPSM

Propulsion and Power Research

Research paper thumbnail of Non-Fourier heat transfer in a moving longitudinal radiative-convective dovetail fin

Case Studies in Thermal Engineering

Research paper thumbnail of A physical depiction of a semi-spherical fin unsteady heat transfer and thermal analysis of a fully wetted convective-radiative semi-spherical fin

Journal of the Indian Chemical Society

Research paper thumbnail of Role of ternary hybrid nanofluid in the thermal distribution of a dovetail fin with the internal generation of heat

Case Studies in Thermal Engineering

Research paper thumbnail of Convective-radiative thermal investigation of a porous dovetail fin using spectral collocation method

Ain Shams Engineering Journal

Research paper thumbnail of Exploration of Temperature Distribution through a Longitudinal Rectangular Fin with Linear and Exponential Temperature-Dependent Thermal Conductivity Using DTM-Pade Approximant

Symmetry, 2022

The present study elaborates on the thermal distribution and efficiency of a longitudinal rectang... more The present study elaborates on the thermal distribution and efficiency of a longitudinal rectangular fin with exponentially varying temperature-dependent thermal conductivity and heat transfer coefficient concerning internal heat generation. Also, the thermal distribution of a fin is comparatively studied for both exponentially varying temperature-dependent thermal conductivity and linearly varying temperature-dependent thermal conductivity. Further, the thermal distribution of a longitudinal fin is examined by using ANSYS software with different fin materials. Many physical mechanisms can be explained by ordinary differential equations (ODEs) with symmetrical behavior, the significance of which varies based on the perspective. The governing equation of the considered problem is reduced to a non-linear ODE with the assistance of dimensionless terms. The resultant equation is solved analytically using the DTM-Pade approximant and is also solved numerically using Runge-Kutta Fehlberg...

Research paper thumbnail of LSM and DTM-Pade approximation for the combined impacts of convective and radiative heat transfer on an inclined porous longitudinal fin

Case Studies in Thermal Engineering, 2022

Research paper thumbnail of Flow of Hydromagnetic Micropolar-Casson Nanofluid Over Porous Disks Influenced by Cattaneo-Christov Theory and Slip Effects

Journal of Porous Media, 2022

Research paper thumbnail of Exploring magnetic dipole impact on Maxwell hybrid nanofluid flow over a stretching sheet

Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering, 2022

Background: The rheology of non-Newtonian liquids has piqued the interest of many academics owing... more Background: The rheology of non-Newtonian liquids has piqued the interest of many academics owing to their wide range of applications in smart manufacturing, including plastics processing, biomedical applications, lubrication, chemical engineering and mining. In light of this, we studied the impact of a porous media, heat radiation, magnetic dipole (MD) and convective boundary condition on the Maxwell hybrid nanoliquid stream over a stretching sheet. Methods: The partial differential equations defining flow of liquid are converted to nonlinear ordinary differential equations by using suitable similarity variables, and these equations are solved numerically using the Runge-Kutta Fehlberg 45 (RKF 45) order method with the help of mathematical computing software. Significant findings: The significant impacts of several parameters on the fluid profiles are explained graphically. These graphs reveal that the radial velocity of hybrid nanoliquid declines for diverse values of ferromagneti...

Research paper thumbnail of Significance of Buongiorno Model and Arrhenius Pre-exponential Factor Law to Entropy Optimized Darcy Forchheimer Hybrid Nanoparticle (Al₂O₃, Cu) Flow Over Thin Needle

Journal of Magnetics, 2021

In the fields of engineering, industry, and biology, thin needles serve a critical role. The ther... more In the fields of engineering, industry, and biology, thin needles serve a critical role. The thermocouple hot wire anemometer for wind speed monitoring, microscale heat extraction cooling systems, and electronic microstructure outfitting are only a few of the needle's key applications. In view of these applications the present investigation is carried out to study the Casson hybrid nanofluid flow for the entropy creation and the pre-exponential factor law in Darcy Forchheimer medium on the thin needle. The set of governing equations describing the flow problem will be converted to a system of ordinary differential equations with suitable similarity variables. The numerical solutions are obtained by the aid of mathematical computing software by applying the Runge Kutta Fehlberg 45 method with shooting scheme. The numerical results for various parameters are produced, and an entropy analysis is performed. Axial velocity falls as the porosity and Darcy parameters are increased. The thermal performance improves as the needle size and Brinkman number increase. The concentration profile is improved by thermophoresis, Brinkman number, and activation energy parameter. The entropy generation and surface drag force will increase as the porosity parameters are increased, while the Bejan number will decrease.

Research paper thumbnail of Thermophoretic particle deposition and heat generation analysis of Newtonian nanofluid flow through magnetized Riga plate

Heat Transfer, 2021

The Riga surface is composed of an electromagnetic actuator that comprises a span‐wise associated... more The Riga surface is composed of an electromagnetic actuator that comprises a span‐wise associated array of discontinuous electrodes and an everlasting magnet mounted over a planer surface. The electro‐magneto‐hydrodynamic has an attractive role in thermal reactors, fluidics network flow, liquid chromatography, and micro coolers. Inspired by these applications, a laminar, two‐dimensional nanofluid flow with uniform heat sink‐source, thermophoretic depositions of the particles, and the Newtonian heating effect are investigated. The equations that describe the fluid motion are reduced into a system of ordinary differential equations with the help of spatial similarity variables. Numeric solutions of ordinary differential equations are executed through the Runge–Kutta–Felhberg 45 order technique via a shooting scheme. The role of various nondimensional factors on physically interesting quantities is elaborated graphically. The velocity profile rises for modified Hartmann number and decreases for porosity parameter. Thermal enhancement is high in the common wall temperature condition comparative to the case of the Newtonian heating conditions. The concentration profile is enhanced with Schmidt number, but the reverse trend is observed for the thermophoretic parameter. The rate of mass transfer is increased with Schmidt number.

Research paper thumbnail of Reversible Steganography for RGB Images Using Image Interpolation

Journal of Advanced Research in Dynamical and Control Systems, 2020

Research paper thumbnail of Block-2 Tea

Research paper thumbnail of Notes on breeding of the barred wolf snake (Lycodon striatus) in Nilgiris, Tamil Nadu, India

The Herpetological Bulletin, 2017

1Department of Zoology and Wildlife Biology, Government Arts College, Udhagamandalam-643 002, The... more 1Department of Zoology and Wildlife Biology, Government Arts College, Udhagamandalam-643 002, The Nilgiris, Tamil Nadu, India 2Mammalogy and Forest Ecology wing, Department of Zoology and Wildlife Biology, Government Arts College, Udhagamandalam-643 002 The Nilgiris, Tamil Nadu, India 3Mudumalai Tiger Reserve, Udhagamandalam-643 002, The Nilgiris, Tamil Nadu, India *Corresponding author Email: kingvulture1786@gmail.com NATURAL HISTORY NOTE The Herpetological Bulletin 141, 2017: 42-43

Research paper thumbnail of Effects of variation of patch size and seam size in patch based texture synthesis

2010 Second International conference on Computing, Communication and Networking Technologies, 2010

This paper presents a simple image-based method of generating novel visual appearance in which a ... more This paper presents a simple image-based method of generating novel visual appearance in which a new image can be synthesized by stitching together small patches of existing images. This is a fast and very simple texture synthesis algorithm for patches of uniform size which produces surprisingly good results for a wide range of textures. Further, to improve the visual perception of synthesized texture, a modified patch based synthesis technique, in which the neighboring patches of the synthesized output are made to overlap is proposed. Here instead of picking out a random block, the algorithm searches for a block that, by some measure agrees with its neighbors along the region where overlap takes place. Experiments with different sample textures for different patch sizes and seam sizes are carried out and the quality of the synthesized outputs are measured in terms of quantifying parameters like entropy, histogram matching and computation time. Comparisons with existing techniques d...

Research paper thumbnail of Impact of microbial enzymes on the quality of CTC black tea

Research paper thumbnail of Theoretical evaluation of flow through centrifugal compressor stage

In this paper a three dimensional viscous flow field in a Centrifugal Impeller with backswept and... more In this paper a three dimensional viscous flow field in a Centrifugal Impeller with backswept and lean has been numerically analyzed using a commercial code (FLUENT) to understand the physics of complex real flow phenomena. The study was taken to investigate the flow interaction13; between impeller and vane diffuser for three different setting angles. It was shown at design point the13; flow at the exit of the impeller is uniform and the classical jet wake pattern is absent. At the intermediate13; plane between impeller inlet and exit and within vane diffuser channel the flow behaves like a potential13; flow. The stage analysis carried out using mixing plane formulation for three diffuser settings provided13; the optimum diffuser setting angle for maximum stage efficiency.

Research paper thumbnail of Exploration of Arrhenius activation energy on hybrid nanofluid flow over a curved stretchable surface

ZAMM - Journal of Applied Mathematics and Mechanics / Zeitschrift für Angewandte Mathematik und Mechanik, 2021

Scientists and engineers have experimentally noticed that the heat transfer is essential for pree... more Scientists and engineers have experimentally noticed that the heat transfer is essential for preeminence of multi scale production. Thermal properties are naturally accomplished via continuous phase liquids. Its importance is nevertheless constrained by the low capacity for heat transfer. Consequently, the increased heat transference phenomenon must be employed to accomplish the expected results. In this regard, the nature of the Arrhenius activation energy in the flow of hybrid nanoliquid over a curved stretchable surface (CSS) in the presence of exponential heat generation is scrutinized. The fluid suspended with Manganese zinc ferrite (MnZnFe2O4) and Nickel zinc ferrite (NiZnFe2O4) as nanoparticles along with Kerosene oil as a base liquid is accounted in this study. The described flow equations are transformed by using appropriate similarity variables and then they are tackled with Runge Kutta Fehlberg‐45 (RKF‐45) scheme by adopting shooting process. It can be concluded that, the increasing values of Biot number and heat source/sink parameter improves the thermal gradient. Further, hybrid nanofluid shows high heat transfer rate when compared to nanoliquid for improved values of heat source/sink parameter.

Research paper thumbnail of Heat transfer and thermal analysis in a semi-spherical fin with temperature-variant thermal properties: an application of Probabilists’ Hermite collocation method

Waves in Random and Complex Media

Research paper thumbnail of Study of thermal variation in a longitudinal exponential porous fin wetted with TiO2−SiO2/ hexanol hybrid nanofluid using hybrid residual power series method

Case Studies in Thermal Engineering

Research paper thumbnail of Significance of thermal stress in a convective-radiative annular fin with magnetic field and heat generation: application of DTM and MRPSM

Propulsion and Power Research

Research paper thumbnail of Non-Fourier heat transfer in a moving longitudinal radiative-convective dovetail fin

Case Studies in Thermal Engineering

Research paper thumbnail of A physical depiction of a semi-spherical fin unsteady heat transfer and thermal analysis of a fully wetted convective-radiative semi-spherical fin

Journal of the Indian Chemical Society

Research paper thumbnail of Role of ternary hybrid nanofluid in the thermal distribution of a dovetail fin with the internal generation of heat

Case Studies in Thermal Engineering

Research paper thumbnail of Convective-radiative thermal investigation of a porous dovetail fin using spectral collocation method

Ain Shams Engineering Journal

Research paper thumbnail of Exploration of Temperature Distribution through a Longitudinal Rectangular Fin with Linear and Exponential Temperature-Dependent Thermal Conductivity Using DTM-Pade Approximant

Symmetry, 2022

The present study elaborates on the thermal distribution and efficiency of a longitudinal rectang... more The present study elaborates on the thermal distribution and efficiency of a longitudinal rectangular fin with exponentially varying temperature-dependent thermal conductivity and heat transfer coefficient concerning internal heat generation. Also, the thermal distribution of a fin is comparatively studied for both exponentially varying temperature-dependent thermal conductivity and linearly varying temperature-dependent thermal conductivity. Further, the thermal distribution of a longitudinal fin is examined by using ANSYS software with different fin materials. Many physical mechanisms can be explained by ordinary differential equations (ODEs) with symmetrical behavior, the significance of which varies based on the perspective. The governing equation of the considered problem is reduced to a non-linear ODE with the assistance of dimensionless terms. The resultant equation is solved analytically using the DTM-Pade approximant and is also solved numerically using Runge-Kutta Fehlberg...

Research paper thumbnail of LSM and DTM-Pade approximation for the combined impacts of convective and radiative heat transfer on an inclined porous longitudinal fin

Case Studies in Thermal Engineering, 2022

Research paper thumbnail of Flow of Hydromagnetic Micropolar-Casson Nanofluid Over Porous Disks Influenced by Cattaneo-Christov Theory and Slip Effects

Journal of Porous Media, 2022

Research paper thumbnail of Exploring magnetic dipole impact on Maxwell hybrid nanofluid flow over a stretching sheet

Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering, 2022

Background: The rheology of non-Newtonian liquids has piqued the interest of many academics owing... more Background: The rheology of non-Newtonian liquids has piqued the interest of many academics owing to their wide range of applications in smart manufacturing, including plastics processing, biomedical applications, lubrication, chemical engineering and mining. In light of this, we studied the impact of a porous media, heat radiation, magnetic dipole (MD) and convective boundary condition on the Maxwell hybrid nanoliquid stream over a stretching sheet. Methods: The partial differential equations defining flow of liquid are converted to nonlinear ordinary differential equations by using suitable similarity variables, and these equations are solved numerically using the Runge-Kutta Fehlberg 45 (RKF 45) order method with the help of mathematical computing software. Significant findings: The significant impacts of several parameters on the fluid profiles are explained graphically. These graphs reveal that the radial velocity of hybrid nanoliquid declines for diverse values of ferromagneti...

Research paper thumbnail of Significance of Buongiorno Model and Arrhenius Pre-exponential Factor Law to Entropy Optimized Darcy Forchheimer Hybrid Nanoparticle (Al₂O₃, Cu) Flow Over Thin Needle

Journal of Magnetics, 2021

In the fields of engineering, industry, and biology, thin needles serve a critical role. The ther... more In the fields of engineering, industry, and biology, thin needles serve a critical role. The thermocouple hot wire anemometer for wind speed monitoring, microscale heat extraction cooling systems, and electronic microstructure outfitting are only a few of the needle's key applications. In view of these applications the present investigation is carried out to study the Casson hybrid nanofluid flow for the entropy creation and the pre-exponential factor law in Darcy Forchheimer medium on the thin needle. The set of governing equations describing the flow problem will be converted to a system of ordinary differential equations with suitable similarity variables. The numerical solutions are obtained by the aid of mathematical computing software by applying the Runge Kutta Fehlberg 45 method with shooting scheme. The numerical results for various parameters are produced, and an entropy analysis is performed. Axial velocity falls as the porosity and Darcy parameters are increased. The thermal performance improves as the needle size and Brinkman number increase. The concentration profile is improved by thermophoresis, Brinkman number, and activation energy parameter. The entropy generation and surface drag force will increase as the porosity parameters are increased, while the Bejan number will decrease.

Research paper thumbnail of Thermophoretic particle deposition and heat generation analysis of Newtonian nanofluid flow through magnetized Riga plate

Heat Transfer, 2021

The Riga surface is composed of an electromagnetic actuator that comprises a span‐wise associated... more The Riga surface is composed of an electromagnetic actuator that comprises a span‐wise associated array of discontinuous electrodes and an everlasting magnet mounted over a planer surface. The electro‐magneto‐hydrodynamic has an attractive role in thermal reactors, fluidics network flow, liquid chromatography, and micro coolers. Inspired by these applications, a laminar, two‐dimensional nanofluid flow with uniform heat sink‐source, thermophoretic depositions of the particles, and the Newtonian heating effect are investigated. The equations that describe the fluid motion are reduced into a system of ordinary differential equations with the help of spatial similarity variables. Numeric solutions of ordinary differential equations are executed through the Runge–Kutta–Felhberg 45 order technique via a shooting scheme. The role of various nondimensional factors on physically interesting quantities is elaborated graphically. The velocity profile rises for modified Hartmann number and decreases for porosity parameter. Thermal enhancement is high in the common wall temperature condition comparative to the case of the Newtonian heating conditions. The concentration profile is enhanced with Schmidt number, but the reverse trend is observed for the thermophoretic parameter. The rate of mass transfer is increased with Schmidt number.

Research paper thumbnail of Reversible Steganography for RGB Images Using Image Interpolation

Journal of Advanced Research in Dynamical and Control Systems, 2020

Research paper thumbnail of Block-2 Tea

Research paper thumbnail of Notes on breeding of the barred wolf snake (Lycodon striatus) in Nilgiris, Tamil Nadu, India

The Herpetological Bulletin, 2017

1Department of Zoology and Wildlife Biology, Government Arts College, Udhagamandalam-643 002, The... more 1Department of Zoology and Wildlife Biology, Government Arts College, Udhagamandalam-643 002, The Nilgiris, Tamil Nadu, India 2Mammalogy and Forest Ecology wing, Department of Zoology and Wildlife Biology, Government Arts College, Udhagamandalam-643 002 The Nilgiris, Tamil Nadu, India 3Mudumalai Tiger Reserve, Udhagamandalam-643 002, The Nilgiris, Tamil Nadu, India *Corresponding author Email: kingvulture1786@gmail.com NATURAL HISTORY NOTE The Herpetological Bulletin 141, 2017: 42-43

Research paper thumbnail of Effects of variation of patch size and seam size in patch based texture synthesis

2010 Second International conference on Computing, Communication and Networking Technologies, 2010

This paper presents a simple image-based method of generating novel visual appearance in which a ... more This paper presents a simple image-based method of generating novel visual appearance in which a new image can be synthesized by stitching together small patches of existing images. This is a fast and very simple texture synthesis algorithm for patches of uniform size which produces surprisingly good results for a wide range of textures. Further, to improve the visual perception of synthesized texture, a modified patch based synthesis technique, in which the neighboring patches of the synthesized output are made to overlap is proposed. Here instead of picking out a random block, the algorithm searches for a block that, by some measure agrees with its neighbors along the region where overlap takes place. Experiments with different sample textures for different patch sizes and seam sizes are carried out and the quality of the synthesized outputs are measured in terms of quantifying parameters like entropy, histogram matching and computation time. Comparisons with existing techniques d...

Research paper thumbnail of Impact of microbial enzymes on the quality of CTC black tea

Research paper thumbnail of Theoretical evaluation of flow through centrifugal compressor stage

In this paper a three dimensional viscous flow field in a Centrifugal Impeller with backswept and... more In this paper a three dimensional viscous flow field in a Centrifugal Impeller with backswept and lean has been numerically analyzed using a commercial code (FLUENT) to understand the physics of complex real flow phenomena. The study was taken to investigate the flow interaction13; between impeller and vane diffuser for three different setting angles. It was shown at design point the13; flow at the exit of the impeller is uniform and the classical jet wake pattern is absent. At the intermediate13; plane between impeller inlet and exit and within vane diffuser channel the flow behaves like a potential13; flow. The stage analysis carried out using mixing plane formulation for three diffuser settings provided13; the optimum diffuser setting angle for maximum stage efficiency.

Research paper thumbnail of Exploration of Arrhenius activation energy on hybrid nanofluid flow over a curved stretchable surface

ZAMM - Journal of Applied Mathematics and Mechanics / Zeitschrift für Angewandte Mathematik und Mechanik, 2021

Scientists and engineers have experimentally noticed that the heat transfer is essential for pree... more Scientists and engineers have experimentally noticed that the heat transfer is essential for preeminence of multi scale production. Thermal properties are naturally accomplished via continuous phase liquids. Its importance is nevertheless constrained by the low capacity for heat transfer. Consequently, the increased heat transference phenomenon must be employed to accomplish the expected results. In this regard, the nature of the Arrhenius activation energy in the flow of hybrid nanoliquid over a curved stretchable surface (CSS) in the presence of exponential heat generation is scrutinized. The fluid suspended with Manganese zinc ferrite (MnZnFe2O4) and Nickel zinc ferrite (NiZnFe2O4) as nanoparticles along with Kerosene oil as a base liquid is accounted in this study. The described flow equations are transformed by using appropriate similarity variables and then they are tackled with Runge Kutta Fehlberg‐45 (RKF‐45) scheme by adopting shooting process. It can be concluded that, the increasing values of Biot number and heat source/sink parameter improves the thermal gradient. Further, hybrid nanofluid shows high heat transfer rate when compared to nanoliquid for improved values of heat source/sink parameter.