Papers by Mohan Krishna S A
Mathematical theory and modeling, 2016
Through this paper, we studied the effects of non uniform het source/sink on unsteady flow of Pow... more Through this paper, we studied the effects of non uniform het source/sink on unsteady flow of Powell-Eyring fluid past an inclined stretching sheet with suction/injection effects. The governing equations are transformed into a system of ordinary differential equations by making use of self similarity transformations and then solved numerically using Runge-Kutta based shooting technique. Further we studied the influence of governing parameters on the flow, heat transfer, friction factor and local Nusselt number through graphs and tables, which are obtained using MATLAB package. From this study, it is found that increasing values of non uniform heat source/sink parameters enhances the temperature.
The objective of this paper is to study the effect of Chemical reaction and Radiation on MHD free... more The objective of this paper is to study the effect of Chemical reaction and Radiation on MHD free convection flow of Kuvshinshiki fluid through a vertical porous plate with heat source taking Visco-elastic and Darcy resistance terms into account and the constant permeability of the medium numerically and neglecting induced magnetic field in comparison to applied magnetic field. The velocity, temperature, concentration and skin friction distributions are derived, discussed numerically with the help of graphs.
Advances in Physics Theories and Applications, 2013
In this study, we analyse the effects of thermal radiation on unsteady natural convective flow of... more In this study, we analyse the effects of thermal radiation on unsteady natural convective flow of a nanofluid past an impulsively started infinite vertical plate. The nanofluid contains heat treatable nickel chromium iron alloy (Nimonic 80A) nanoparticles with Ethylene Glycol as base fluid. The partial differential equations governing the flow are solved numerically by MATALB pde solver package. The effects of various parameters on velocity and temperature profiles, as well as Nusselt number and Skin friction coefficient are examined and presented graphically .It is found that rate of heat transfer increases by increase in thermal radiation and change of particle shape. Also we observed that the decrease in radiation parameter leads to fall the value of skin friction coefficient. Shape of nanoparticles doesn't effects velocity of the fluid.
Weathering is the adverse response of a material or product to climate, often causing unwanted an... more Weathering is the adverse response of a material or product to climate, often causing unwanted and premature product failure. The factors responsible for weathering are; solar radiation (light energy), temperature and water (moisture). The specifications of weathering cycles in Indian standards refereed from European regulations, American standards or Japanese standards; hence the entire weathering specifications based on the respective countries data. These specifications may not be suitable for Indian weathering climate as well as usage requirements. Any material design should permit the independent selection of the major degrading forces such as UV radiation, temperature, humidity, and rain. Thus the selection of the right combination for a particular location and time of year should be easy and should give a cycle that truly simulates natural conditions. Hence, deriving the data for the standards as per Indian requirements is of prime importance. In this context, collected the I...
Metal matrix composites have been regarded to be one of the most principal classifications in com... more Metal matrix composites have been regarded to be one of the most principal classifications in composite materials. Microstructural analysis and metallography is one of the predominant terms commonly used in the research of materials. The thermal characterization of composite materials has received broad deliberation and has become governing in materials science and engineering. In this paper, the microstructural investigation of Al 6061, silicon carbide (SiC) and graphite (Gr) hybrid metal matrix composites with varying percentage reinforcements 2.5%, 5%, 7.5% and 10% have been carried out. The analysis of these hybrid compositions have been accomplished by using optical microscope, scanning electron microscope and energy dispersive spectroscopy that benefits to accomplish thermal characterization and analysis of composite material. Aluminium based composites reinforced with silicon carbide and graphite particles have been prepared by stir casting technique. It has been observed tha...
International Journal of Materials Science and Engineering, 2015
Metal Matrix Composites (MMCs) are the competitive and proficient materials that possess natural ... more Metal Matrix Composites (MMCs) are the competitive and proficient materials that possess natural opportunities for modern material science and development. The mechanical, tribological, thermal and machinability properties of composite materials are extensively pertinent for aerospace and automotive applications. In this paper, the determination of density, volume fraction and porosity has been carried out successfully. In the research, Al 6061 is the matrix alloy and Silicon Carbide and Graphite are the reinforcements considered, being fabricated using stir casting technique. Microstructural analysis has been carried out using Scanning Electron Microscope to examine the distribution of the reinforcements. Finite Element Analysis (FEA) has been used to simulate the thermal and mechanical behaviour of Metal Matrix Composites. Computational simulation for the investigation of thermal properties of hybrid metal matrix composites has been performed depending on the variation in volume fraction of hybrid MMCs. To carry out computational modelling, the experimental values have been used to show the temperature distribution and heat flow distribution characteristics, being considered as the salient thermal properties of composite materials.
International Journal of Material Science, 2015
Metal matrix composites are regarded to be one of the most predominant classifications in composi... more Metal matrix composites are regarded to be one of the most predominant classifications in composite materials. The thermal characterization of hybrid metal matrix composites has been increasingly important in a wide range of applications. The coefficient of thermal expansion, thermal conductivity, thermal diffusivity and specific heat capacity are the most important properties of Metal Matrix Composites (MMCs). Since nearly all Metal Matrix Composites are used in various temperature ranges, measurement of thermal properties of MMCs as a function of temperature is necessary in order to know the behaviour of the material. In this research paper, the evaluation of thermal conductivity, thermal diffusivity, thermal expansivity and thermal capacity has been accomplished for Al 6061, Silicon Carbide and Graphite hybrid metal matrix composites from room temperature to 300°C. Aluminium based composites reinforced with Silicon Carbide and Graphite particles have been prepared by stir casting technique. The thermal behaviour of hybrid composites with different percentage compositions of reinforcements has been investigated. The results have indicated that the thermal properties of the different compositions of hybrid MMCs vary by the addition of Graphite with Silicon Carbide and Al 6061. Few empirical models have been validated for the evaluation of thermal expansivity and thermal conductivity of hybrid composites.
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Papers by Mohan Krishna S A