Dufour Effect

Dufour effect

[¦dü·fȯr i′fekt]
(thermodynamics)
Energy flux due to a mass gradient occurring as a coupled effect of irreversible processes.

Dufour Effect

 

the inverse phenomenon of thermal diffusion. If two chemically different nonreacting gases or liquids, which were initially at the same temperature, are allowed to diffuse into each other, then there arises a difference of temperatures in the system. In gases this difference can reach several degrees (for example, for nitrogen with hydrogen), while in liquids it measures approximately 103°C. The difference in temperatures is retained if a concentration gradient is maintained. The effect was first observed by the Swiss physicist L. Dufour in 1873.

REFERENCE

Groot, C., and P. Mazur. Neravnovesnaia termodinamika. Moscow, 1964. (Translated from English.)
References in periodicals archive ?
The Dufour effect was recently found to be of order of considerable magnitude so that it cannot be neglected, Eckert and Drake [16].
In view of the above studies, the purpose of current investigation is to examine the influence of Soret and Dufour effects on MHD free convective heat and mass transfer flow over a vertical channel with constant suction and viscous dissipation.
Consider the flow of an unsteady laminar coupled free convective heat and mass transfer of an incompressible fluid past a vertical channel in a porous medium under the influence of a uniform transverse magnetic field and constant suction with viscous dissipation in the presence of Soret and Dufour effects.
The present paper analyzes the influence of Soret and Dufour effects on MHD free convective heat and mass transfer flow over a vertical channel with constant suction and viscous dissipation.
However, the Dufour effect is considered insignificant for porous capillary bodies.
Keywords: Free convection, Porous medium, Vertical plate, Dufour effect, Soret effect.
Very recently, Postelnicu [10] studied numerically the influence of a magnetic field on heat and mass transfer by natural convection from vertical surfaces in porous media considering Soret and Dufour effects.
Postelnicu (2004): Influence of a magnetic field on heat and mass transfer by natural convection from vertical surfaces in porous media considering Soret and Dufour effects, Int.
Steady flows with chemical reaction considering Soret and Dufour effect are to be found in the studies by Mansour et al.
Postelnicu, "Influence of a magnetic field on heat and mass transfer by natural convection from vertical surfaces in porous media considering Soret and Dufour effects," International Journal of Heat and Mass Transfer, vol.
Huang, "Numerical study of Soret and Dufour effects on heat and mass transfer from natural convection flow over a vertical porous medium with variable wall heat fluxes," Computational Materials Science, vol.