Morphology, propagation dynamics and scaling characteristics of drying fronts in porous media

Effects of surface wettability on the dynamics and morphology of evaporation‐induced drying fronts (DF) receding into hydrophilic (HI) or hydrophobic (HO) sands were studied using highly‐resolved neutron radiography. A more pronounced pinning‐depinning motion (larger steps and longer waiting times)...

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Published in:Geophysical research letters 2012-05, Vol.39 (9), p.n/a
Main Authors: Shokri, N., Sahimi, Muhammad, Or, D.
Format: Article
Language:English
Subjects:
Drying
Earth sciences
Earth, ocean, space
Evaporation
Evaporation rate
Exact sciences and technology
fractal dimension
Fractals
Geophysics
Hydrology
liquid phase distribution
Nonlinear systems
Porous media
Radiography
roughness of drying front
Sand
wettability effects
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Sahimi, Muhammad
Or, D.
description Effects of surface wettability on the dynamics and morphology of evaporation‐induced drying fronts (DF) receding into hydrophilic (HI) or hydrophobic (HO) sands were studied using highly‐resolved neutron radiography. A more pronounced pinning‐depinning motion (larger steps and longer waiting times) was observed for the DF in HI sand relative to HO, due to weaker capillary pinning forces in the latter. For length scalesl smaller than a correlation length ξ, quenched disorder dominates DF roughness expressed by a roughness exponent α = 0.77, whereas for l > ξ the fluctuations induced by the DF motion annealed the disorder and result in α= 0.44. Although wettability suppressed evaporation rates in HO relative to HI sand, differences in the evaporation dynamics and pinning behavior did not alter the DF morphology indicators‐the fractal dimension and roughness exponent‐which remained similar for the HI and HO sands. Key Points Hydrophobicity reduces velocity of DF displacement Wettability weakly affects the fractal dimension and roughness exponent of DF Lesser wettability limits the extent of film region and the evaporation rate
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source Wiley-Blackwell AGU Digital Archive
subjects Drying
Earth sciences
Earth, ocean, space
Evaporation
Evaporation rate
Exact sciences and technology
fractal dimension
Fractals
Geophysics
Hydrology
liquid phase distribution
Nonlinear systems
Porous media
Radiography
roughness of drying front
Sand
wettability effects
title Morphology, propagation dynamics and scaling characteristics of drying fronts in porous media
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