Water thermophoresis in carbon nanotubes: the interplay between thermophoretic and friction forces

Oyarzua, Elton; Walther, Jens Honoré; Zambrano, Harvey

doi:10.1039/c7cp05749k

Cited by 25 publications

(19 citation statements)

References 64 publications

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“…We consider a rectangular cell of L×w = 20.2×7.8 nm in an infinite free-standing graphene layer. In analogy to experiments [6,19,20], two thermal energy reservoirs having different temperatures (T 1 and T 2 ) are placed at the both sides of this cell, as shown in Fig. 1.…”

Section: Figmentioning

confidence: 99%

Selective Conduction of Organic Molecules via Free-Standing Graphene

Wang

2019

J. Phys. Chem. C

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A race is held between ten species of organic gas molecules on a graphene substrate driven by thermal gradients via molecular dynamics. Fast conduction of the molecules is observed with selectivity for aromatic compounds. This selectivity stems from the fact that the planar structure of the aromatic molecule helps keep a shorter distance to the substrate, which is the key to the driving force at the gas-solid interface. The drift velocity monotonically increases with decreasing molecule density, with no ballistic transport observable even for a single molecule. A non-linear regime is discovered for the conduction of benzene molecules under large thermal gradients. At low temperature, molecules formed aggregation and move collectively along specific path in the graphene substrate.

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Section: Figmentioning

confidence: 99%

Selective Conduction of Organic Molecules via Free-Standing Graphene

Wang

2019

J. Phys. Chem. C

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“…In addition, we conclude that the microscopic motion of the multisolution nanofluid base fluid has a significant effect on heat transfer. Firstly, the Marangoni effect [64] and the thermophoresis [133] effect of nanoparticles are enhanced due to the enhancement of the density difference between the base liquids. Secondly, the micromotion of the multisolution during the boiling process causes the disturbance of bubbles on the heated surface to increase.…”

Section: Effect Of Nanofluid On Critical Heat Transfer and Boiling Hementioning

confidence: 99%

Effect of Nanofluids on Boiling Heat Transfer Performance

Yao

Teng

2019

Applied Sciences

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At present, there are many applications of nanofluids whose research results are fruitful. Nanofluids can enhance the critical heat flux, but the effect on boiling heat transfer performance still has disagreement. Base liquids with higher viscosity improve the boiling heat transfer performance of nanofluids. When the base liquid is a multicomponent solution, the relative movement between the different solutions enhances the microscopic movement of the nanoparticles due to the different evaporation order during the boiling process, so that the boiling heat transfer performance is enhanced. Compared with the thermal conductivity of the heated surface, the deposition of the low thermal conductivity nanoparticles reduces the heat dissipation rate of the heated surface and improves the wall superheat. Then the enhancement of the boiling heat transfer coefficient should be attributed to the thermal conductivity improvement of base fluid and the bubble disturbance resulted from the nanoparticle’s microscopic motion.

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“…Тепловой поток вдоль нанотрубок может вызывать движение внутри нанотрубок наночастиц золота [6,7], нанокапель воды [8][9][10][11][12][13], вложенных нанотрубок [14][15][16] и молекул фуллерена C 60 [17,18]. Движение частиц внутри нанотрубок вызывается их взаимодействием с тепловыми фононами и происходит против градиента температуры: от теплого конца нанотрубки к холодному.…”

Section: Introductionunclassified

Термофорез Одноатомных Частиц В Открытых Нанотрубках

Савин¹,

Савина²

2021

Физика Твердого Тела

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Using the method of molecular dynamics, it is shown that thermophoresis of particles (atoms) inside single-walled carbon nanotubes (CNTs) is highly efficient. Placing a particle inside the CNT involved in heat transfer causes it to move in the direction of the heat flow at a constant speed, the value of which weakly depends on the length of the nanotube. The heat flow along the CNT leads to the formation of a constant thermophoresis force for the particles inside. The direction of this force coincides with the direction of heat transfer. The monatomic nature of the particle allowed us to numerically calculate this force and to determine the contribution to this force of interaction with each thermal phonon of the nanotube. It is shown that the magnitude of the force is almost completely determined by the interaction of the particle with long-wave bending phonons of the nanotube, which have a long free run path. Therefore, the speed of the particle movement and the value of the thermophoresis force depend weakly on the length of the nanotube, but are determined by the temperature difference at its ends. Because of this, the mode of thermophoresis of particles inside nanotubes is ballistic, not diffusive.

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Water thermophoresis in carbon nanotubes: the interplay between thermophoretic and friction forces

Cited by 25 publications

References 64 publications

Selective Conduction of Organic Molecules via Free-Standing Graphene

Selective Conduction of Organic Molecules via Free-Standing Graphene

Effect of Nanofluids on Boiling Heat Transfer Performance

Термофорез Одноатомных Частиц В Открытых Нанотрубках

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