Observation of Temperature Peaks due to Strong Viscous Heating in a Dusty Plasma Flow

Feng, Yan; Goree, J.; Liu, Bin

doi:10.1103/physrevlett.109.185002

Cited by 84 publications

(51 citation statements)

References 39 publications

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“…This previous work includes experiments [16,17] and theoretical simulations [18][19][20]. Other transport coefficients that have been studied experimentally for 2D dusty plasmas include shear viscosity [10,21,22] and thermal conductivity [23][24][25][26]. Simulations have also been reported for shear viscosity [27,28], longitudinal viscosity [29], and thermal conductivity [15,30,31].…”

Section: Introductionmentioning

confidence: 99%

Superdiffusion of two-dimensional Yukawa liquids due to a perpendicular magnetic field

et al. 2014

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Stochastic transport of a two-dimensional (2D) dusty plasma liquid with a perpendicular magnetic field is studied. Superdiffusion is found to occur especially at higher magnetic fields with β of order unity. Here, β = ωc/ω pd is the ratio of the cyclotron and plasma frequencies for dust particles. The mean-square displacement MSD = 4Dαt α is found to have an exponent α > 1, indicating superdiffusion, with α increasing monotonically to 1.1 as β increases to unity. The 2D Langevin molecular dynamics simulation used here also reveals that another indicator of random particle motion, the velocity autocorrelation function (VACF), has a dominant peak frequency ω peak that empirically obeys ω

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Section: Introductionmentioning

confidence: 99%

Superdiffusion of two-dimensional Yukawa liquids due to a perpendicular magnetic field

et al. 2014

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“…As it does in fluids, viscosity in plasmas affects instabilities [10], waves [11][12][13], vortices [14], and heating [15]. Despite these similarities, plasmas have unusual viscosity properties because the underlying Coulomb forces have a long range, unlike the short-range interactions typical of liquids and gases.…”

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Overestimation of Viscosity by the Green-Kubo Method in a Dusty Plasma Experiment

Haralson

Goree

2017

Phys. Rev. Lett.

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“…The lighter charged components of the dusty plasma (electrons and positive ions) are weakly coupled. Dusty plasmas have much in common with other strongly coupled plasmas, such as ultracold neutral plasmas 21 , and warm dense matter 22 as well.The collection of microspheres can undergo a liquid-like flow when external forces are applied by laser beams [23][24][25][26][27] . In this way, the microspheres can be driven into a shear flow-that is, a flow with a transverse gradient in the flow velocity.…”

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Strongly coupled plasmas obey the fluctuation theorem for entropy production

et al. 2017

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Fluctuation theorems 1-4 describe nonequilibrium stochastic behaviour in small systems. Whilst experiments have shown that fluctuation theorems are obeyed by single particles in liquids 5 and several other physical systems 6-10 , it has not been shown if that is the case in strongly coupled plasmas. Plasmas are said to be strongly coupled when interparticle potential energies are large compared to kinetic energies. Charged particles in such plasmas can behave collectively like liquids 11,12 , but with essential di erences, such as long-range collisions 13 . It remains unexplored whether, despite these di erences, the stochastic behaviour of strongly coupled plasmas will obey fluctuation theorems. Here we demonstrate experimentally that a strongly coupled dusty plasma obeys the fluctuation theorem of Evans, Cohen, and Morriss (ECM) 14 , which was developed for a simple liquid in a nonequilibrium steady state. This fluctuation theorem describes the entropy production arising from collisions in a steady laminar shear flow.A dusty plasma 15-17 is a four-component mixture of microspheres, electrons, positive ions, and a rarefied neutral gas, which all share a volume 18 . The microspheres, which are the heaviest of these components, develop large charges 19 so that they become strongly coupled 20 . The lighter charged components of the dusty plasma (electrons and positive ions) are weakly coupled. Dusty plasmas have much in common with other strongly coupled plasmas, such as ultracold neutral plasmas 21 , and warm dense matter 22 as well.The collection of microspheres can undergo a liquid-like flow when external forces are applied by laser beams [23][24][25][26][27] . In this way, the microspheres can be driven into a shear flow-that is, a flow with a transverse gradient in the flow velocity. In the shear flow, entropy production results from collisions between microspheres.Many fluctuation theorems centre on the rate of entropy production in nonequilibrium systems below the thermodynamic limit. Fluctuation theorems (not to be confused with the similarly named fluctuation-dissipation theorem) all spawned from the ECM fluctuation theorem; this original fluctuation theorem was developed especially for a steady-state laminar shear flow. In a shear flow, entropy production is generated by viscous heating. This viscous heating is always positive in the thermodynamic limit, but it can fluctuate briefly to negative values for a subsystem within the fluid, containing a small number of molecules. These fluctuations, with negative heating and therefore negative entropy production, have been described as violations of the second law of thermodynamics 14 .The ECM fluctuation theorem compares these negative-entropyproduction fluctuations to the more common positive fluctuations. In particular, the probabilities of these two kinds of fluctuations are predicted to have a ratio obeying 14,28 ln p(We will later summarize equation (1), which is the historically important ECM fluctuation theorem, as left-hand side equals righthand side ...

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Observation of Temperature Peaks due to Strong Viscous Heating in a Dusty Plasma Flow

Cited by 84 publications

References 39 publications

Superdiffusion of two-dimensional Yukawa liquids due to a perpendicular magnetic field

Superdiffusion of two-dimensional Yukawa liquids due to a perpendicular magnetic field

Overestimation of Viscosity by the Green-Kubo Method in a Dusty Plasma Experiment

Strongly coupled plasmas obey the fluctuation theorem for entropy production

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