Porosity waves in a fluidized sand–column test

Abstract

Fluidized sand-column experiments performed at the IKU provided insight into the mechanism of density adjustment to the conditions of flow against the direction of gravity, and for hydraulic gradients around and past the critical value corresponding to the 'quick' condition. X-ray computer-tomography scan images obtained during these tests show a process which could be described as a kinematic density or porosity-wave motion. Forchheimer's flow law, holding in the post-critical regime, is calibrated by using the storage equation and the data concerning the propagation velocity of the observed porosity waves. Finally, the observed rarefaction waves are simulated mathematically and experimental results are back-analysed.

Pore Fluid Extraction by Reactive Solitary Waves in 3‐D

“…This reactive‐infiltration mechanism (see review in De Wit ()) was used to explain patterns observed in a variety of geological processes including oil recovery (Daccord et al, ), karst formation (Ortoleva et al, ; Szymczak, ), fluid ascent in the crust (Koulakov et al, ), melt migration (Jordan & Hesse, ; Hewitt, ; Hesse et al, ; Liang et al, ; Keller & Katz, ; Rudge et al, ; Schiemenz et al, ; Weatherley & Katz, ; Spiegelman et al, ), and inner core growth (Sumita et al, ). It also led to numerous studies aiming at reproducing instabilities in the laboratory (Osselin et al, ; Pec et al, ; Vardoulakis et al, ) and developing the theoretical framework to model this process (Szymczak & Ladd, , ; Wangen, ).…”