When the Hotter Cools More Quickly: Mpemba Effect in Granular Fluids.

@article{Lasanta2017WhenTH,
  title={When the Hotter Cools More Quickly: Mpemba Effect in Granular Fluids.},
  author={Antonio Lasanta and Francisco Vega Reyes and Antonio Prados and Andr{\'e}s Santos},
  journal={Physical review letters},
  year={2017},
  volume={119 14},
  pages={
          148001
        }
}
Under 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… 
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