caa a22 4500 46316363X CHVBK 20180406164755.0 cr unu---uuuuu 170326e20070501xx s 000 0 eng 10.1007/s11242-006-9060-9 doi (NATIONALLICENCE)springer-10.1007/s11242-006-9060-9 Traveling liquid bridges in unsaturated fractured porous media [Elektronische Daten] [Dani Or, Teamrat Ghezzehei] Interplay between capillary, gravity and viscous forces in unsaturated fractures gives rise to a range of complex flow phenomena. Evidence of highly intermittent fluxes, preferential and sustainable flow pathways lead to potentially significant flow focusing of concern for regulatory and management of water resources in fractured rock formations. In previous work[Ghezzehei TA,Or D.: Water Resour. Res. In Review(2005)] we developed mechanistic models for formation, growth and detachment of liquid bridges in geometrical irregularities within fractures. Such discrete and intermittent flows present a challenge to standard continuum theories. Our focus here is on predicting travel velocities of detached liquid elements and their interactions with fracture walls. The scaling relationships proposed by Podgorski etal. [Podgorski, T., etal.: Phys. Rev. Lett. 8703(3), 6102-NIL_95 (2001)] provide a general framework for processes affecting travel velocities of discrete liquid elements in fractures, tubes, and in coarse porous media. Comparison of travel velocity and distance by discrete bridges relative to equivalent continuous film flow reveal significantly faster and considerably larger distances traversed by liquid bridges relative to liquid films. Coalescence and interactions between liquid bridges result in complex patterns of travel times and distances. Mass loss on rough fracture surfaces shortens travel distances of an element; however, results show that such retardation provides new opportunities for coalescence of subsequent liquid elements traveling along the same path, resulting in mass accumulation and formation of larger liquid elements traveling larger distances relative to smooth fracture surfaces. Such flow focusing processes may be amplified considering a population of liquid bridges within a fracture plane and mass accumulation in fracture intersections. Springer Science+Business Media, Inc., 2006 Intermittent flow nationallicence Fracture nationallicence Dripping nationallicence Liquid bridge nationallicence Transport nationallicence Or Dani School of Architectural, Civil and Environmental Engineering (ENAC/ISTE), Ecole Polytechnique Federale de Lausanne (EPFL), Bâtiment, GR 2 (room 399), CH-1015, Lausanne, Switzerland aut Ghezzehei Teamrat Earth Sciences Division, Lawrence Berkley National Laboratory, Berkley, CA, USA aut Transport in Porous Media Kluwer Academic Publishers 68/1(2007-05-01), 129-151 0169-3913 68:1<129 2007 68 11242 https://doi.org/10.1007/s11242-006-9060-9 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11242-006-9060-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Or Dani School of Architectural, Civil and Environmental Engineering (ENAC/ISTE), Ecole Polytechnique Federale de Lausanne (EPFL), Bâtiment, GR 2 (room 399), CH-1015, Lausanne, Switzerland aut NATIONALLICENCE 700 1- Ghezzehei Teamrat Earth Sciences Division, Lawrence Berkley National Laboratory, Berkley, CA, USA aut NATIONALLICENCE 773 0- Transport in Porous Media Kluwer Academic Publishers 68/1(2007-05-01), 129-151 0169-3913 68:1<129 2007 68 11242 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer