One argued with me that solute transported by the capillary rise as advection. Can it really be? My counter argument was for media like clayey soils, the velocity of the capillary rise is much slower. So according to J=CV equation, in such media, dispersion should be dominant.
What do you think?
Thanks in advance
I guess it is a question of the Peclet number! If the advective rise of the liquid is sufficiently high it might dominate, if it is rather slow dispersion dominates. So i a sense you both are correct.
Pe = vL/D
v is the crossectional averaged rise velocity due to capillary forces
L is a characteristic length, possibly the capillary length
D is the dispersion coefficient for axial dispersion along L
So for Pe >> 1 advection dominates, for Pe
Andre is right. It is all a matter of the physical parameters of the problem. Capillary rise usually occurs due to a pressure jump on the interface, however the intensity of the Péclet number will inform which physical mechanism is more prominent: diffusion or advection.
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