The heat and mass transfer characteristics of natural convection flow of a chemically-reacting
Newtonian fluid along vertical and inclined plates in the presence of diffusion-thermo
(Dufour) and thermal-diffusion (Soret) effects are studied. The conservation equations for
mass, momentum, heat and concentration are normalized and then solved using the local
nonsimilarity method and a shooting scheme. Velocity is increased with order of the chemical
reaction (m) as is temperature (θ) and concentration (φ).Temperature (θ) is increased with
increasing positive inclination of the plate (γ), whereas velocity (f/) is reduced. An increase in
reaction rate parameter (χ) however reduces the concentration values in the boundary layer.
Skin friction coefficient is found to be enhanced with a positive increase in concentration-tothermal-
buoyancy ratio parameter (N) as are local Nusselt number and the local Sherwood
number. A negative N value reverses this trend. An increase in Dufour number, Du (with a
simultaneous decrease in Soret number), (Sr) significantly heats the fluid and also increases
concentration values. For the non-reactive case, neglecting Dufour and Soret effects, good
correlation of the present numerical solutions is achieved with the earlier study by Chen et al
(1980). The present study finds applications in chemical engineering, furnaces, solar collector
energy systems and geophysical fluid mechanics