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P. Ganesan - One of the best experts on this subject based on the ideXlab platform.

  • radiation effects on an unsteady natural Convective Flow of a nanofluid past an infinite vertical plate
    NANO, 2013
    Co-Authors: P. Loganathan, Nirmal P Chand, P. Ganesan
    Abstract:

    An exact analysis is carried out to study the radiation effects on an unsteady natural Convective Flow of a nanofluid past an impulsively started infinite vertical plate. The nanofluids containing nanoparticles of aluminium oxide, copper, titanium oxide and silver with nanoparticle volume fraction range less than or equal to 0.04 are considered. The partial differential equations governing the Flow are solved by Laplace transform technique. The influence of various parameters on velocity and temperature profiles, as well as Nusselt number and skin-friction coefficient, are examined and presented graphically. An increase in radiation parameter and time leads to fall in temperature of the fluid. The presence of nanoparticles and thermal radiation increases the rate of heat transfer and skin friction. The effect of heat transfer is found to be more pronounced in silver water nanofluid than in the other nanofluids. It is observed that the fluid velocity increases with an increase in Grashof number and time. E...

  • MHD effects on free Convective Flow over moving semi-infinite vertical cylinder with temperature oscillation
    Applied Mathematics and Mechanics, 2011
    Co-Authors: P. Loganathan, M. Kannan, P. Ganesan
    Abstract:

    Numerical solutions of magnetodynamics (MHD) effects on the free Convective Flow of an incompressible viscous fluid past a moving semi-infinite vertical cylinder with temperature oscillation are presented. The dimensionless, unsteady, non-linear, and coupled governing partial differential equations are solved by using an implicit finite difference method of the Crank-Nicolson type. The velocity, temperature, and concentration profiles are studied for various parameters. The local skin-friction, the average skinfriction, the Nusselt number, and the Sherwood number are also analyzed and presented graphically. The results are compared with available results in literature, and are found to be in good agreement.

E Momoniat - One of the best experts on this subject based on the ideXlab platform.

  • comments on effects of temperature dependent fluid properties and variable prandtl number on the transient Convective Flow due to a porous rotating disk by m s alam s m chapal hossain m m rahman meccanica 2014 49 2439 2451
    Meccanica, 2017
    Co-Authors: P M Patil, E Momoniat
    Abstract:

    In this letter, we submit our comments on recently published paper titled “Effects of temperature dependent fluid properties and variable Prandtl number on the transient Convective Flow due to a porous rotating disk by Alam et al. (Meccanica 49: 2439–2451, 2014)”. Authors of this paper have attempted to present similarity solutions in the paper. We comment in this letter is that the similarity transformations considered in Alam et al. (Meccanica 49: 2439–2451, 2014) are not correct and thus results are leading to invalid conclusions.

  • lie group solution for free Convective Flow of a nanofluid past a chemically reacting horizontal plate in a porous media
    Mathematical Problems in Engineering, 2014
    Co-Authors: M M Rashidi, E Momoniat, M Ferdows, A Basiriparsa
    Abstract:

    The optimal homotopy analysis method (OHAM) is employed to investigate the steady laminar incompressible free Convective Flow of a nanofluid past a chemically reacting upward facing horizontal plate in a porous medium taking into account heat generation/absorption and the thermal slip boundary condition. Using similarity transformations developed by Lie group analysis, the continuity, momentum, energy, and nanoparticle volume fraction equations are transformed into a set of coupled similarity equations. The OHAM solutions are obtained and verified by numerical results using a Runge-Kutta-Fehlberg fourth-fifth order method. The effect of the emerging Flow controlling parameters on the dimensionless velocity, temperature, and nanoparticle volume fraction have been presented graphically and discussed. Good agreement is found between analytical and numerical results of the present paper with published results. This close agreement supports our analysis and the accuracy of the numerical computations. This paper also includes a representative set of numerical results for reduced Nusselt and Sherwood numbers in a table for various values of the parameters. It is concluded that the reduced Nusselt number increases with the Lewis number and reaction parameter whist it decreases with the order of the chemical reaction, thermal slip, and generation parameters.

Samuel O Adesanya - One of the best experts on this subject based on the ideXlab platform.

P. Loganathan - One of the best experts on this subject based on the ideXlab platform.

  • radiation effects on an unsteady natural Convective Flow of a nanofluid past an infinite vertical plate
    NANO, 2013
    Co-Authors: P. Loganathan, Nirmal P Chand, P. Ganesan
    Abstract:

    An exact analysis is carried out to study the radiation effects on an unsteady natural Convective Flow of a nanofluid past an impulsively started infinite vertical plate. The nanofluids containing nanoparticles of aluminium oxide, copper, titanium oxide and silver with nanoparticle volume fraction range less than or equal to 0.04 are considered. The partial differential equations governing the Flow are solved by Laplace transform technique. The influence of various parameters on velocity and temperature profiles, as well as Nusselt number and skin-friction coefficient, are examined and presented graphically. An increase in radiation parameter and time leads to fall in temperature of the fluid. The presence of nanoparticles and thermal radiation increases the rate of heat transfer and skin friction. The effect of heat transfer is found to be more pronounced in silver water nanofluid than in the other nanofluids. It is observed that the fluid velocity increases with an increase in Grashof number and time. E...

  • MHD effects on free Convective Flow over moving semi-infinite vertical cylinder with temperature oscillation
    Applied Mathematics and Mechanics, 2011
    Co-Authors: P. Loganathan, M. Kannan, P. Ganesan
    Abstract:

    Numerical solutions of magnetodynamics (MHD) effects on the free Convective Flow of an incompressible viscous fluid past a moving semi-infinite vertical cylinder with temperature oscillation are presented. The dimensionless, unsteady, non-linear, and coupled governing partial differential equations are solved by using an implicit finite difference method of the Crank-Nicolson type. The velocity, temperature, and concentration profiles are studied for various parameters. The local skin-friction, the average skinfriction, the Nusselt number, and the Sherwood number are also analyzed and presented graphically. The results are compared with available results in literature, and are found to be in good agreement.

Moo Hwan Kim - One of the best experts on this subject based on the ideXlab platform.

  • visualization study of the effects of nanoparticles surface deposition on Convective Flow boiling chf from a short heated wall
    International Journal of Multiphase Flow, 2011
    Co-Authors: Ho Seon Ahn, Soonho Kang, Hyungdae Kim, Moo Hwan Kim
    Abstract:

    Abstract Enhancements of nucleate boiling critical heat flux (CHF) using nanofluids in a pool boiling are well known. Considering importance of Flow boiling heat transfer in various practical applications, an experimental study on CHF enhancements of nanofluids under Convective Flow conditions was performed. Changing Flow velocity from 0 m/s to 4 m/s, the water boiling on nanoparticles-coated heater was conducted and CHF increased at a given velocity. To understand clearly the mechanism of Flow boiling CHF enhancement in nanofluid, the visualization of the nucleate boiling and CHF phenomenon was conducted using the high-speed video camera. It was found that the boiling heat transfer on the nanoparticles-coated heater was lower than that on bare heater, which induced the different Flow regime at same heat flux. The different wetting zone on bare and nanoparticles-coated heaters was observed by visualization study. Based the wetting zone fraction, there was brief that the nucleate boiling fraction on heater would be related with the surface wettability. A new concept of Flow boiling model was proposed based on the wetting zone fraction. Finally, the effect of nanoparticles deposition layer on the heater was interpreted with the physical mechanisms to increase CHF.

  • experimental study of critical heat flux enhancement during forced Convective Flow boiling of nanofluid on a short heated surface
    International Journal of Multiphase Flow, 2010
    Co-Authors: Ho Seon Ahn, Soonho Kang, Wonpyo Chang, Hyungdae Kim, Moo Hwan Kim
    Abstract:

    Enhancements of nucleate boiling critical heat flux (CHF) using nanofluids in a pool boiling are well-known. Considering importance of Flow boiling heat transfer in various practical applications, an experimental study on CHF enhancements of nanofluids under Convective Flow conditions was performed. A rectangular Flow channel with 10-mm width and 5-mm height was used. A 10 mm-diameter disk-type copper surface, heated by conduction heat transfer, was placed at the bottom surface of the Flow channel as a test heater. Aqueous nanofluids with alumina nanoparticles at the concentration of 0.01% by volume were investigated. The experimental results showed that the nanofluid Flow boiling CHF was distinctly enhanced under the forced Convective Flow conditions compared to that in pure water. Subsequent to the boiling experiments, the heater surfaces were examined with scanning electron microscope and by measuring contact angle. The surface characterization results suggested that the Flow boiling CHF enhancement in nanofluids is mostly caused by the nanoparticles deposition of the heater surface during vigorous boiling of nanofluids and the subsequent wettability enhancements.