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Das, Kalidas,Sharma, Ram Prakash,Sarkar, Amit Society for Computational Design and Engineering 2016 Journal of computational design and engineering Vol.3 No.4
The present work is concerned with heat and mass transfer of an electrically conducting second grade MHD fluid past a semi-infinite stretching sheet with convective surface heat flux. The analysis accounts for thermophoresis and thermal radiation. A similarity transformations is used to reduce the governing equations into a dimensionless form. The local similarity equations are derived and solved using Nachtsheim-Swigert shooting iteration technique together with Runge-Kutta sixth order integration scheme. Results for various flow characteristics are presented through graphs and tables delineating the effect of various parameters characterizing the flow. Our analysis explores that the rate of heat transfer enhances with increasing the values of the surface convection parameter. Also the fluid velocity and temperature in the boundary layer region rise significantly for increasing the values of thermal radiation parameter.
Kalidas Das,Pinaki Ranjan Duari,Prabir Kumar Kundu 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.11
In this paper, we investigate the hydromagnetic bioconvection of gyrotactic microorganisms past a permeable vertical plate embeddedin a porous medium filled with a water-based nanofluid. The model for the nanofluid, proposed by Kuznetsov and Nield [23], incorporatesBrownian motion, thermophoresis, bioconvection of gyrotactic microorganisms and chemical reaction. Using appropriate similaritytransformations, the model boundary value problem is tackled numerically using bvp4c function from Matlab. The influences of bioconvectionparameters, chemical reaction parameter, inverse Darcy number etc on the velocity, temperature, nanoparticle concentration andthe micro-organisms density profiles are analyzed and discussed in detail. A comparative analysis of our results with previously reportedresults in the literature is given.
Influence of chemical reaction and viscous dissipation on MHD mixed convection flow
Kalidas Das 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.5
This paper investigates the effect of chemical reaction and viscous dissipation on MHD mixed convective heat and mass transfer flowof a viscous, incompressible, electrically conducting second grade fluid past a semi-infinite stretching sheet in the presence of thermaldiffusion and thermal radiation with Rosseland approximation. The governing boundary layer equations are written into a dimensionlessform by similarity transformations. Numerical results for the dimensionless velocity, temperature, concentration profiles as well as for theskin friction coefficient, Nusselt number and Sherwood number are obtained and displayed through graphs and tables for pertinent parametersto show interesting aspects of the solution.
Cu-water nanofluid flow and heat transfer over a shrinking sheet
Kalidas Das 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.12
The influence of an external magnetic field and thermal radiation on Cu-water nanofluid flow and heat transfer over a shrinking sheetwith slip surface was studied. The governing partial differential equations for steady two dimensional flows are reduced to self-similarordinary differential equations by similarity transformation technique and then solved numerically using Runge-Kutta-Fehlberg methodwith shooting technique. Physical interpretation of various embedding parameters is assigned through graphs and tables for the velocityand temperature profiles as well as for skin friction coefficient and Nusselt number.
Kalidas Das,Nilangshu Acharya,Prabir Kumar Kundu 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.67 No.7
This paper is devoted to an investigation of the influences of thermal radiation on an unsteady, mixed, convection boundary layer flow and the heat transfer over a vertical heated permeable stretching sheet embedded in a porous medium. Different models of the nanofluid based on different formulae for the thermal conductivity and the dynamic viscosity and their effects on the fluid flow and the heat transfer characteristics are discussed. Using the similarity transformation, we transform the governing equations into similarity, non-linear, ordinary differential equations which are solved by employing a numerical shooting technique with a fourth-order Runge-Kutta integration scheme. The obtained results are presented graphically, and the physical aspects of the problem are discussed.
Tanmoy Chakraborty,Kalidas Das,Prabir Kumar Kundu 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.5
The heat absorber uses in solar power plants have generally low energy adaptation owing to large emissive losses at high temperature. Recently, nanofluid based solar energy absorber have acknowledged immense scientific curiosity to competent share and store the thermal energy. Here we examine theoretically the natural convective flow of an Ag nanoparticle based nanofluid flow along an inclined flat sheet embedded in a Darcy-Forchheimer permeable medium coexistence of solar radiation. By use of similarity transformations, the fundamental partial differential system and boundary conditions are tackled numerically using Runge-Kutta Gill based shooting procedure. The impacts of governing parameters upon the flow, temperature, Nusselt number and skin friction coefficient are represented tabular as well as in graphical form.
Nilankush Acharya,Kalidas Das,Prabir Kumar Kundu 한국CDE학회 2019 Journal of computational design and engineering Vol.6 No.4
An investigation has been carried out to demonstrate the performance of heat transfer and entropy gen-eration in a regenerative cooling channel of a rocket engine. The Nanofluid flow in composition with fer-rous nanoparticles has been utilized. Foremost equations are reduced to its non-dimensional shape using similarity renovation and sketched out using variational iterative method (VIM). Impression of the per-tinent factors on hydrothermal performance has been brought forwarded via tables and graphs. Favourable comparison originates the basis of our present work. Result communicates that non-dimensional entropy generation amplifies in response to the parameter R and Bejan number intensifies for the parameter N. Significance or application of the present literature is to provide kerosene based fer-rofluid as a coolant of rocket engine and how pertinent factors affect the entropy inside the system. Parametric study of this investigation will aid aerospace engineers to design the regenerative equipment in an effective way.
Shib Sankar Giri,Kalidas Das,Prabir Kumar Kundu 한국CDE학회 2020 Journal of computational design and engineering Vol.7 No.3
Hydromagnetic nanofluid flow through an incompressible stretching cylinder accompanying with homogeneous–heterogeneous chemical reaction has been executed in current literature. SWCNTs (single-walled carbon nanotubes) and MWCNTs (multiwalled carbon nanotubes) as nanoparticles in appearance of prescribed heat flux are accounted here. Leading equations of the assumed model have been normalized through similarity practice and succeeding equations resolved numerically by spending RK-4 shooting practice and analytically by engaging differential transform method. The impulse of promising flow constraints on the flow characteristic is finalized precisely through graphs and charts. We perceived that velocity outlines and temperature transmission are advanced in MWCNT than SWCNT in every case.