scholarly journals Effect of Fluctuating Surface Heat and Mass Flux on Natural Convection Flow along a Vertical Flat Plate

2015 ◽  
Vol 2015 ◽  
pp. 1-15 ◽  
Author(s):  
Sharmina Hussain ◽  
Nepal C. Roy ◽  
Md. Anwar Hossain ◽  
Suvash C. Saha
Keyword(s):  
Mass Transfer ◽  
Mass Flux ◽  
Surface Heat ◽  
Asymptotic Solutions ◽  
Convection Flow ◽  
Surface Mass ◽  
Coupled Equations ◽  
Surface Mass Transfer ◽  
Stress Surface ◽  
Layer Flow

An investigation has been carried on double diffusive effect on boundary layer flow due to small amplitude oscillation in surface heat and mass flux. Extensive parametric simulations were performed in order to elucidate the effects of some important parameters, that is, Prandtl number, Schmidt number, and Buoyancy ratio parameter on flow field in conjunction with heat and mass transfer. Asymptotic solutions for low and high frequencies are obtained for the conveniently transformed governing coupled equations. Solutions are also obtained for wide ranged value of the frequency parameters. Comparisons between the asymptotic and wide ranged values are made in terms of the amplitudes and phases of the shear stress, surface heat transfer, and surface mass transfer. It has been found that the amplitudes and phase angles obtained from asymptotic solutions are found in good agreement with the finite difference solutions obtained for wide ranged value of the frequency parameter.

scholarly journals Boundary layer flow and heat transfer over a permeable shrinking cylinder with surface mass transfer

2013 ◽  
Vol 18 (4) ◽  
pp. 1003-1012 ◽  
Author(s):  
K. Bhattacharyya ◽  
R.S.R. Gorla
Keyword(s):  
Heat Transfer ◽  
Boundary Layer ◽  
Mass Transfer ◽  
Differential Equations ◽  
Boundary Layer Flow ◽  
Surface Mass ◽  
Surface Mass Transfer ◽  
Flow And Heat Transfer ◽  
Curvature Parameter ◽  
Layer Flow

Abstract In the present paper, the axisymmetric boundary layer flow and heat transfer past a permeable shrinking cylinder subject to surface mass transfer is studied. The similarity transformations are adopted to convert the governing partial differential equations for the flow and heat transfer into the nonlinear self-similar ordinary differential equations and then solved by a finite difference method using the quasilinearization technique. From the current investigation, it is found that the velocity in the boundary layer region decreases with the curvature parameter and increases with suction mass transfer. Moreover, with the increase of the curvature parameter, the suction parameter and Prandtl number, the heat transfer is enhanced.

Effects of injection (suction) on a steady mixed convection boundary layer flow over a vertical cone

2009 ◽  
Vol 19 (3/4) ◽  
pp. 432-444 ◽  
Author(s):  
R. Ravindran ◽  
Satyajit Roy ◽  
E. Momoniat
Keyword(s):  
Heat Transfer ◽  
Mass Transfer ◽  
Mixed Convection ◽  
Thermal Design ◽  
Convection Flow ◽  
Convection Boundary Layer ◽  
Vertical Cone ◽  
Content Type ◽  
Surface Mass ◽  
Surface Mass Transfer

PurposeThe purpose of this paper is to study the steady mixed convection flow over a vertical cone in the presence of surface mass transfer when the axis of the cone is inline with the flow.Design/methodology/approachIn this case, the numerical difficulties to obtain the non‐similar solution are overcome by applying an implicit finite difference scheme in combination with the quasilinearization technique.FindingsNumerical results are reported here to display the effects of Prandtl number, buoyancy and mass transfer (injection and suction) parameters at different stream‐wise locations on velocity and temperature profiles, and on skin friction and heat transfer coefficients.Research limitations/implicationsThermo‐physical properties of the fluid in the flow model are assumed to be constant except the density variations causing a body force term in the momentum equation. The Boussinesq approximation is invoked for the fluid properties to relate the density changes to temperature changes and to couple in this way the temperature field to the flow field.Practical implicationsConvective heat transfer over a stationary cone is important for the thermal design of various types of industrial equipments such as heat exchangers, conisters for nuclear waste disposal, nuclear reactor cooling systems and geothermal reservoirs, etc.Originality/valueThe combined effects of thermal diffusion and surface mass transfer on a vertical cone has been studied.

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