论文标题

MPEMBA样效应方案,用于非弹性和粗糙硬盘的颗粒气体

Mpemba-like effect protocol for granular gases of inelastic and rough hard disks

论文作者

Megías, Alberto, Santos, Andrés

论文摘要

我们研究了由MPEMBA样效应在非弹性和粗糙硬盘的颗粒气中出现的条件,这些磁盘由一类恒温器驱动,其特征在于将噪声强度分解为转化和旋转对应物。因此,颗粒颗粒会受到随机力和随机扭矩的影响,分别注入了翻译和旋转能量。我们意识到,只有在转化速度方面传递到旋转自由度的噪声的总强度和噪声的比例,就可以选择该类别的恒温器的一定选择。首先,MPEMBA效应的特征在于被考虑样品的温度曲线之间的交叉表现。后来,观察到了相对于稳态值的过冲,并改变了MPEMBA效应的机理。参数的选举允许根据这些恒温器设计合理的方案,以生成初始状态,以观察实验中的mpemba样效应。为了获得明确的结果,我们使用有充分的Maxwellian近似来进行演化动力学和稳态数量。最后,将理论结果与直接模拟蒙特卡洛和分子动力学结果进行了比较,并发现了非常好的一致性。

We study the conditions under which a Mpemba-like effect emerges in granular gases of inelastic and rough hard disks driven by a class of thermostats characterized by the splitting of the noise intensity into translational and rotational counterparts. Thus, granular particles are affected by a stochastic force and a stochastic torque, which inject translational and rotational energy, respectively. We realize that a certain choice of a thermostat of this class can be characterized just by the total intensity and the fraction of noise transferred to the rotational degree of freedom with respect to the translational ones. Firstly, Mpemba effect is characterized by the appearance of a crossing between the temperature curves of the considered samples. Later, an overshoot of the temperature evolution with respect to the steady-state value is observed and the mechanism of Mpemba effect generation is changed. The election of parameters allows to design plausible protocols based on these thermostats for generating the initial states to observe the Mpemba-like effect in experiments. In order to obtain explicit results, we use a well-founded Maxwellian approximation for the evolution dynamics and the steady-state quantities. Finally, theoretical results are compared with direct simulation Monte Carlo and molecular dynamics results, and a very good agreement is found.

扫码加入交流群

加入微信交流群

微信交流群二维码

扫码加入学术交流群,获取更多资源