Volume 136, Number 4, November 2021
|Number of page(s)||5|
|Section||Condensed Matter: Structural, Mechanical and Thermal Properties|
|Published online||03 March 2022|
Mpemba effect in an anisotropically driven granular gas
1 The Institute of Mathematical Sciences, C.I.T. Campus - Taramani, Chennai 600113, India
2 Homi Bhabha National Institute, Training School Complex - Anushakti Nagar, Mumbai 400094, India
3 Department of Physics, Cochin University of Science and Technology - Kochi 682022, India
Received: 24 April 2021
Accepted: 6 October 2021
The Mpemba effect refers to the counterintuitive relaxation wherein a hotter system equilibrates faster than a cooler system when quenched to a cold temperature. Even though the effect has been illustrated for isotropically driven granular gases, a prototypical system far from equilibrium, its existence requires non-stationary initial states, limiting experimental realisation. In this paper, we demonstrate the existence of the Mpemba effect in anisotropically driven granular gases, even when quenched from initial states that are stationary. Our theoretical predictions, based on kinetic theory, for the regular, inverse and strong Mpemba effects agree well with results of event-driven molecular dynamics simulations of hard discs.
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