Speaker
Animesh Nepal
(Institute of Environmental Assessment and Water Research (IDAEA-CSIC))
Description
We study experimentally and numerically the mechanisms of interfacial jumps, pinning and capillary hysteresis along an elementary pore. To this end, we analyze quasi-static fluid imbibition and drainage cycles in a capillary tube with conical constrictions (ink-bottle). Depending on the slope of the conical section, we observe a range of interfacial behaviors, including capillary jumps, and interface pinning during both imbibition and drainage, which give rise to capillary hysteresis, that is, history dependence of the interface position.
A theoretical model based on pressure balance at the interface captures the full spectrum of behaviors in terms of the pore geometry, contact angle and surface tension.
| Country | Spain |
|---|---|
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Primary author
Animesh Nepal
(Institute of Environmental Assessment and Water Research (IDAEA-CSIC))
Co-authors
Ivan Lunati
(Empa)
Jordi Ortín
(Universitat de Barcelona)
Juan J. Hidalgo
(IDAEA-CSIC)
Marco Dentz
(IDAEA-CSIC)
