arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1601.07547cond-mat.stat-mechcond-mat.mes-hall
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机械式自主随机热机

A mechanical autonomous stochastic heat engine

Marc Serra-Garcia, André Foehr, Miguel Molerón, Joseph Lydon, Christopher Chong, Chiara Daraio

摘要:

随机热机是使用少量高度波动的自由度从随机热运动产生功的装置。这种装置的建议已经存在了一个多世纪,包括麦克斯韦恶魔和费曼棘轮。直到最近,它们才被实验证明,例如,在光阱中实施的热循环。然而,最近的示范随机热机是非自治的,因为它们需要一个外部控制系统,规定一个加热和冷却循环,消耗更多的能量比他们生产。本报告提出了一个热机组成的三个耦合机械谐振器(两个丝带和一个悬臂)受到随机驱动。该发动机使用几何非线性的共振带自动转换成一个低熵的随机激励,悬臂梁的非被动振荡。该发动机呈现负热导率的异常热传输特性,包括被动地将能量从冷储层传递到热储层的能力。

英文摘要:

Stochastic heat engines are devices that generate work from random thermal motion using a small number of highly fluctuating degrees of freedom. Proposals for such devices have existed for more than a century and include the Maxwell demon and the Feynman ratchet. Only recently have they been demonstrated experimentally, using e.g., thermal cycles implemented in optical traps. However, the recent demonstrations of stochastic heat engines are nonautonomous, since they require an external control system that prescribes a heating and cooling cycle, and consume more energy than they produce. This Report presents a heat engine consisting of three coupled mechanical resonators (two ribbons and a cantilever) subject to a stochastic drive. The engine uses geometric nonlinearities in the resonating ribbons to autonomously convert a random excitation into a low-entropy, nonpassive oscillation of the cantilever. The engine presents the anomalous heat transport property of negative thermal conductivity, consisting in the ability to passively transfer energy from a cold reservoir to a hot reservoir.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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