Mass Diffusion Equation
Variable temperature, Concentration and variable mass diffusion required discussion according to Numerical solutions. The velocity field is discussed for the chemical reaction parameter, phase angle, thermal and mass Grashof number in Figures 1-7. The mass diffusion Equation (10) can be adjusted to meet that one takes (i) K > 0 means the destructive reaction, (ii) K < 0 means the generative reaction (iii) K = 0 means no reaction.
The steady – state profile for different phase angle are shown Figure.1. The velocity profiles presented are those at X=1.0.Decrease in velocity with increasing phase angle. Here ω t=0 represents a vertical plate, while the velocity profiles coming from U=1 and ω t= π⁄2 represent a horizontal plate, with the velocity
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The velocity distribution in the boundary layer of natural convection represents different values of thermal Grashof numbers or mass Grashof number are shown graphically in Figure. 6. This shows an effective increase in velocity due to buoyancy with increasing thermal Grashof numbers or mass Grashof number.
The dimensionless Schmidt number is the ratio of momentum diffusivity to the convection mass diffusivity. The concentration profiles for a different Schmidt number and chemical reaction parameter, , , are shown in Figure .7. The velocity decreases due to the gases diffusing into the air with increasing chemical reaction parameter and the Schmidt number. This shows the destructive reaction in the chemical reaction parameter and the Schmidt number leading to a fall in the velocity due to buoyancy force decreases in density. The local skin friction values are calculated from Equation (16) and plotted in Figure.8. Skin friction coefficient refers to local value and physically refers to the ratio of Local wall shear stress to characterize dynamic in the fluid. Local skin friction increases with a decreasing of phase angle . A Nusselt number of different phase angle is shown in Figure.9. The local nusselt number decreases with increasing phase
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