Lasanta Becerra, AntonioVega Reyes, FranciscoPrados, AntonioSantos, Andrés2017-11-152017-11-152017-10-06Lasanta, A., Vega, F., Prados, A., Santos, A. When de hotter cools more quickly: Mpemba effect in granular fluids. Physical review letters (2017), 119 (14) 1480010031-9007 (print)1079-7114 (online)1092-0145 (CD-Rom)https://hdl.handle.net/10016/25838Under certain conditions, two samples of fluid at different initial temperatures present a counterintuitive behavior known as the Mpemba effect: it is the hotter system that cools sooner. Here, we show that the Mpemba effect is present in granular fluids, both in uniformly heated and in freely cooling systems. In both cases, the system remains homogeneous, and no phase transition is present. Analytical quantitative predictions are given for how differently the system must be initially prepared to observe the Mpemba effect, the theoretical predictions being confirmed by both molecular dynamics and Monte Carlo simulations. Possible implications of our analysis for other systems are also discussed.6application/pdfeng© 2017 American Physical SocietyKinetic theoryNonequilibrium & irreversible thermodynamicsThermal propertiesGranular flowsGranular fluidsVibrofluidized granular materialsBoltzmann theoryMonte Carlo methodsresearch articleFísicaMaterialeshttps://doi.org/10.1103/PhysRevLett.119.148001open access148001-114148001-6Physical review letters119AR/0000020493