Depinning and dynamics of imbibition fronts in paper under increasing ambient humidity

Alexander S. Balankin, H. Zapata López, E. Pineda León, D. Morales Matamoros, L. Morales Ruiz, Dan Silva López, M. A. Rodríguez

Research output: Contribution to journalArticle

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Abstract

We study the effects of ambient air humidity on the dynamics of imbibition in a paper. We observed that a quick increase of ambient air humidity leads to depinning and non-Washburn motion of wetting fronts. Specifically, we found that after depinning the wetting front moves with decreasing velocity vâ̂ ( h p/ h D) γ, where h D is the front elevation with respect to its pinned position at lower humidity h p , while γ≅1/3. The spatiotemporal maps of depinned front activity are established. The front motion is controlled by the dynamics of local avalanches directed at 30 to the balk flow direction. Although the roughness of the pinned wetting front is self-affine and the avalanche size distribution displays a power-law asymptotic, the roughness of the moving front becomes multiaffine a few minutes after depinning. © 2013 American Physical Society.
Original languageAmerican English
JournalPhysical Review E - Statistical, Nonlinear, and Soft Matter Physics
DOIs
StatePublished - 15 Jan 2013

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Humidity
humidity
Wetting
wetting
Avalanche
Roughness
avalanches
roughness
Self-affine
Motion
air
Power Law

Cite this

Balankin, Alexander S. ; Zapata López, H. ; Pineda León, E. ; Morales Matamoros, D. ; Morales Ruiz, L. ; Silva López, Dan ; Rodríguez, M. A. / Depinning and dynamics of imbibition fronts in paper under increasing ambient humidity. In: Physical Review E - Statistical, Nonlinear, and Soft Matter Physics. 2013.
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Depinning and dynamics of imbibition fronts in paper under increasing ambient humidity. / Balankin, Alexander S.; Zapata López, H.; Pineda León, E.; Morales Matamoros, D.; Morales Ruiz, L.; Silva López, Dan; Rodríguez, M. A.

In: Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, 15.01.2013.

Research output: Contribution to journalArticle

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AB - We study the effects of ambient air humidity on the dynamics of imbibition in a paper. We observed that a quick increase of ambient air humidity leads to depinning and non-Washburn motion of wetting fronts. Specifically, we found that after depinning the wetting front moves with decreasing velocity vâ̂ ( h p/ h D) γ, where h D is the front elevation with respect to its pinned position at lower humidity h p , while γ≅1/3. The spatiotemporal maps of depinned front activity are established. The front motion is controlled by the dynamics of local avalanches directed at 30 to the balk flow direction. Although the roughness of the pinned wetting front is self-affine and the avalanche size distribution displays a power-law asymptotic, the roughness of the moving front becomes multiaffine a few minutes after depinning. © 2013 American Physical Society.

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