Pochai, Nopparat

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Pochai, Nopparat
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Pochai, N.
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Email
nopparat.po@kmitl.ac.th

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    Optimal homotopy asymptotic solution for exothermic reactions model with constant heat source in a porous medium
    (2015-01-01)
    Mabood, Fazle
    ;
    Pochai, Nopparat
    The heat flow patterns profiles are required for heat transfer simulation in each type of the thermal insulation. The exothermic reaction models in porous medium can prescribe the problems in the form of nonlinear ordinary differential equations. In this research, the driving force model due to the temperature gradients is considered. A governing equation of the model is restricted into an energy balance equation that provides the temperature profile in conduction state with constant heat source on the steady state. The proposed optimal homotopy asymptotic method (OHAM) is used to compute the solutions of the exothermic reactions equation.
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    Erratum to: Effects of prescribed heat flux and transpiration on MHD axisymmetric flow impinging on stretching cylinder (Continuum Mech. Thermodyn., 10.1007/s00161-016-0519-9)
    (2016-11-01)
    Mabood, Fazle
    ;
    Lorenzini, Giulio
    ;
    Pochai, Nopparat
    ;
    Ibrahim, Sheikh Muhammad
    Unfortunately, one of the author names was incorrectly published in the original version and the same is corrected here. The original publication is corrected as well.
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    Homotopy analysis method for radiation and hydrodynamic-thermal slips effects on MHD flow and heat transfer impinging on stretching sheet
    (2018-01-01)
    Mabood, Fazle
    ;
    Lorenzini, Giulio
    ;
    Pochai, Nopparat
    ;
    Shateyi, Stanford
    This article deals with the analytical study of MHD flow and heat transfer over a permeable stretching sheet via homotopy analysis method (HAM). The effect of thermal radiation is included in the energy equation, while velocity and thermal slips are included in the boundary conditions. The governing boundary layer equations are transformed into a set of ordinary differential equations by means of similarity transformations. The effects of different parameters on the flow field and heat transfer characteristics are examined. The results obtained were shown to compare well with the numerical results and for some special cases with the published data available in the literature, which are in favorable agreement.
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    Comparison of optimal homotopy asymptotic and adomian decomposition methods for a thin film flow of a third grade fluid on a moving belt
    (2015-01-01)
    Mabood, Fazle
    ;
    Pochai, Nopparat
    We have investigated a thin film flow of a third grade fluid on a moving belt using a powerful and relatively new approximate analytical technique known as optimal homotopy asymptotic method (OHAM). The variation of velocity profile for different parameters is compared with the numerical values obtained by Runge-Kutta Fehlberg fourth-fifth order method and with Adomian Decomposition Method (ADM). An interesting result of the analysis is that the three terms OHAM solution is more accurate than five terms of the ADM solution and this thus confirms the feasibility of the proposed method.
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    Effects of prescribed heat flux and transpiration on MHD axisymmetric flow impinging on stretching cylinder
    (2016-11-01)
    Mabood, Fazle
    ;
    Lorenzini, Giulio
    ;
    Pochai, Nopparat
    ;
    Ibrahim, Sheikh Muhammad
    A numerical treatment for axisymmetric flow and heat transfer due to a stretching cylinder under the influence of a uniform magnetic field and prescribed surface heat flux is presented. Numerical results are obtained for dimensionless velocity, temperature, skin friction coefficient and Nusselt number for several values of the suction/injection, magnetic and curvature parameters as well as the Prandtl number. The present study reveals that the controlling parameters have strong effects on the physical quantities of interest. It is seen that the magnetic field enhances the dimensionless temperature inside the thermal boundary layer, whereas it reduces the dimensionless velocity inside the hydrodynamic boundary layer. Heat transfer rate reduces, while the skin friction coefficient increases with magnetic field.
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    Analytical investigation of magnetohydrodynamic flow over a nonlinear porous stretching sheet
    (2016-01-01)
    Mabood, Fazle
    ;
    Pochai, Nopparat
    We investigated the magnetohydrodynamic (MHD) boundary layer flow over a nonlinear porous stretching sheet with the help of semianalytical method known as optimal homotopy asymptotic method (OHAM). The effects of different parameters on fluid flow are investigated and discussed. The obtained results are compared with numerical Runge-Kutta-Fehlberg fourth-fifth-order method. It is found that the OHAM solution agrees well with numerical as well as published data for different assigned values of parameters; this thus indicates the feasibility of the proposed method (OHAM).
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    Stagnation point flow of nanofluid over a moving plate with convective boundary condition and magnetohydrodynamics
    (2016-01-01)
    Mabood, Fazle
    ;
    Pochai, Nopparat
    ;
    Shateyi, Stanford
    A theoretical investigation is carried out to examine the effects of volume fraction of nanoparticles, suction/injection, and convective heat and mass transfer parameters on MHD stagnation point flow of water-based nanofluids (Cu and Ag). The governing partial differential equations for the fluid flow, temperature, and concentration are reduced to a system of nonlinear ordinary differential equations. The derived similarity equations and corresponding boundary conditions are solved numerically using Runge-Kutta Fehlberg fourth-fifth order method. To exhibit the effect of the controlling parameters on the dimensionless velocity, temperature, nanoparticle volume fraction, skin friction factor, and local Nusselt and local Sherwood numbers, numerical results are presented in graphical and tabular forms. It is found that the friction factor and heat and mass transfer rates increase with magnetic field and suction/injection parameters.