Bulletin of the American Physical Society
76th Annual Meeting of the Division of Fluid Dynamics
Sunday–Tuesday, November 19–21, 2023; Washington, DC
Session G06: Porous Media Flows: Micro and Nano
3:00 PM–3:52 PM,
Sunday, November 19, 2023
Room: 102B
Chair: Javed SIDDIQUE, Pennsylvania State University
Abstract: G06.00004 : Interplay of Laplace and Bangham effects during imbibition in nanopores.
3:39 PM–3:52 PM
Presenter:
Juan Sanchez
(Hamburg University of Technology (TUHH))
Authors:
Juan Sanchez
(Hamburg University of Technology (TUHH))
Lars Dammann
(Hamburg University of Technology (TUHH))
Zhuoqing Li
(Hamburg University of Technology (TUHH))
Laura Gallardo
(Hamburg University of Technology (TUHH))
Robert Meissner
(Hamburg University of Technology (TUHH))
Howard A Stone
(Princeton University)
Patrick Huber
(Hamburg University of Technology (TUHH))
Finally, we further investigate the Laplace pressure contribution to the strain. By performing imbibition experiments on unsealed porous monoliths under low humidity conditions, the porous sample is exposed to both inward (imbibition) and outward (evaporation) flows simultaneously. The imbibition flow rate decreases with time while the drying flow rate increases with the wetted volume. When the in- and out-flow rates match, a dynamic equilibrium scenario occurs, resulting in the arresting of the filling front. This state, known as the artificial tree configuration, is characterized by highly curved menisci at the filled-empty (liquid-gas) interface. Therefore, a linear negative pressure gradient exists between the top and bottom of the saturated region, which subjects this wetted portion of the pore space to tensile contraction. As a result, there is no observable disappearance of the Laplace pressure during the dilatometry experiments.
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