“Verification of a Dynamic Scaling for the Pair Correlation Function during the Slow Drainage of a Porous Medium”
M. Moura, K. J. Måløy, E. G. Flekkøy, and R. Toussaint. “Verification of a Dynamic Scaling for the Pair Correlation Function during the Slow Drainage of a Porous Medium“. This paper has just been published by PRL (Physical Review Letters). In this paper we have experimentally verified a 30 years long prediction about how the relative probability of invasion of a pore in a porous medium varies with space and time. When a material full of pores (like a porous rock or a sponge) is soaked in a fluid and another fluid is forced into it, an interesting dynamics arises in which the invading fluid sequentially displaces the other one out of the pores. In the late 80s a group of researchers employed computer simulations to quantify the relative probabilities of such pore displacements, making numerical predictions about how this probability varies with space and time. – By using synthetic porous samples and modern image analysis techniques, we have been able to finally verify those predictions experimentally and to give a full theoretical explanation for the observations. The increased understanding of this kind of phenomena is relevant for many fields in which one fluid displaces another from a porous network, such as CO2 storage in subsea rocks and the remediation of contaminated soils. A popular science article about this work was published in Titan.