Experimental confirmation of the "Faster-is-Slower" effect in various particulate systems

PASTOR, JOSÉ M.; GARCIMARTÍN, ANGEL; MARTÍN, CESAR; GAGO, PAULA A.; PERALTA, JUAN P.; PARISI, DANIEL R.; PUGNALONI, LUIS A.; ZURIGUEL, IKER

La Plata

Workshop; Workshop: Grand Challenges in Particulate Media: From Granular Media to Colloids and Active Matter; 2014

PARISI, D. R. ORADOR The "faster is slower" effect was first reported for simulated pedestrians evacuating a room through a narrow door [1]. It describes the increase of the evacuation time when the desired velocity (vd) (parameterizing the degree of hurry) of the pedestrians increase beyond certain threshold. After more than a decade from the prediction, experimental evidence of the FIS effect was yet not reported. In the present work, we will show that the FIS effect exists in real systems. In particular, for humans evacuating a room, for a flock of sheep and for a granular material. Given the presence of the FIS effect in such different systems, we can hypothesize that it can be a universal feature displayed by particulate matter flowing through constrictions. Moreover, its proper characterization could have important impact in applications in the processing of minerals and food grains and in the safety of pedestrian facilities as well as in many others fields where maximization of flows rate is of crucial importance.