Fluid transport in nanochannels induced by temperature gradients

Liu, Chong; Ya, Lv; Li, Zhigang

doi:10.1063/1.3693334

Cited by 23 publications

(20 citation statements)

References 29 publications

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“…As for the high surface energy, the coupling strength of the water-graphene binding energy is relatively strong and the water-graphene interaction is mainly in the form of pressure drop along the x direction due to the coupling of surface effect, temperature gradient, and elastic collisions. 42 Furthermore, the velocity increases with the temperature gradient attributed to the increase in the pressure drop induced by the rise in temperature gradient.…”

Section: Resultsmentioning

confidence: 99%

Wetting and motion behaviors of water droplet on graphene under thermal-electric coupling field

Zhang

Dong

et al. 2015

Journal of Applied Physics

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Articles you may be interested inLinear relationship between water wetting behavior and microscopic interactions of super-hydrophilic surfaces Ab initio and classical molecular dynamics studies of the structural and dynamical behavior of water near a hydrophobic graphene sheet J. Chem. Phys. 138, 204702 (2013); 10.1063/1.4804300Droplet contact angle behavior on a hybrid surface with hydrophobic and hydrophilic properties A study on the dynamic behaviors of water droplets impacting nanostructured surfaces Wetting dynamics and motion behaviors of a water droplet on graphene are characterized under the electric-thermal coupling field using classical molecular dynamics simulation method. The water droplet on graphene can be driven by the temperature gradient, while the moving direction is dependent on the electric field intensity. Concretely, the water droplet on graphene moves from the low temperature region to the high temperature region for the relatively weak electric field intensity. The motion acceleration increases with the electric field intensity on graphene, whereas the moving direction switches when the electric field intensity increases up to a threshold. The essence is the change from hydrophilic to hydrophobic for the water droplet on graphene at a threshold of the electric field intensity. Moreover, the driven force of the water droplet caused by the overall oscillation of graphene has important influence on the motion behaviors. The results are helpful to control the wettability of graphene and further develop the graphene-based fluidic nanodevices.

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Section: Resultsmentioning

confidence: 99%

Wetting and motion behaviors of water droplet on graphene under thermal-electric coupling field

Zhang

Dong

et al. 2015

Journal of Applied Physics

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“…Similar observations have been already reported in the literature. 15 The variation of mean velocity of fluid inside the (10, 10) CNT with fluid-fluid interaction strength, ε ff , is shown in Fig. 15.…”

Section: Cntsmentioning

confidence: 99%

“…The interaction parameters, ε Ar−Ar = 0.0098 eV and σ Ar = 3.47 Å were used for liquid argon. 15 For C-C interaction in the CNT, ε C−C = 0.0037 eV and σ C = 3.4 Å were used as LJ parameters. 22 ε C−C = 0.024 eV and σ C = 3.34 Å were used as LJ parameters for C-C interactions in graphene.…”

Section: Simulation Detailsmentioning

confidence: 99%

“…MD studies on the mechanism of fluid transport driven by a temperature gradient in nanochannels have shown that the fluid−wall interaction plays a critical role in determining the flow direction. 15 They have reported that for channels of very low surface energy fluid moves from high to low temperature, while for channels with high surface energy the fluid is pumped from low to high temperature. Computational studies have shown that a fluid can be continuously circulated by a symmetric temperature gradient in nanochannels of heterogeneous surface energies.…”

Section: Introductionmentioning

confidence: 99%

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Thermal transpiration through single walled carbon nanotubes and graphene channels

Thekkethala

Sathian

2013

The Journal of Chemical Physics

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Thermal transpiration through carbon nanotubes (CNTs) and graphene channels is studied using molecular dynamics (MD) simulations. The system consists of two reservoirs connected by a CNT. It is observed that a flow is developed inside the CNT from the low temperature reservoir to the high temperature reservoir when the two reservoirs are maintained at different temperatures. The influence of channel size and temperature gradient on the mean velocity is analysed by varying the CNT diameter and the temperature of one of the reservoirs. Larger flow rate is observed in the smaller diameter CNTs showing an increase in the mean velocity with increase in the temperature gradient. For the flow developed inside the CNTs, slip boundaries occur and the slip length is calculated using the velocity profile. We examine the effect of fluid-wall interaction strength (ε(fw)), diffusivity (D), and viscosity of the fluid (μ) on the temperature induced fluid transport through the CNTs. Similar investigations are also carried out by replacing the CNT with a graphene channel. Results show that the mean velocity of the fluid atoms in the graphene channel is lower than that through the CNTs. This can be attributed to the higher degree of confinement observed in the CNTs.

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“…(1) has been m odified by incorporating a disjoining pressure [16] or colum n resistance [17], It has been shown that the infiltration pressure depends on the surface properties, tem perature, and geom etry o f nanopores [11,12,14,15,[19][20][21][22][23], M olecular dynam ics sim ulations have m ainly been used to study how the pore size and tem perature affect the fluid infiltration in CN Ts, w here the surface properties are invariant [11,12,21,22], The general effects o f surface properties have been exam ined by experim ents, w hich have dem onstrated that p\"{ can be changed through surface treatm ent; however, the detailed dependence o f p mt on the surface properties or contact angle still rem ains unknow n [19,20]. O ur previous w ork on the flows in nanochannels reveals that the m olecular interactions betw een fluid m olecules and wall atom s play a critical role and m ake the classic N avier-Stokes equation invalid in certain conditions [6,24,25]. Given the fluid, such m olecular interactions are m ainly dependent on the surface energy, w hich is also expected to be im portant in affecting the fluid infiltration into nanochannels because the fluid contact angle is largely determ ined by the surface energy.…”

Section: Introductionmentioning

confidence: 97%

Fluid infiltration pressure for hydrophobic nanochannels

Zhou

et al. 2015

Phys. Rev. E

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We investigate water infiltration pressure for hydrophobic nanochannels through molecular dynamics simulations. It is found that the entrance energy barrier significantly raises the infiltration pressure, which makes the classic Young-Laplace equation invalid for nanochannels. As the channel surface is tuned from superhydrophobic to hydrophobic, the infiltration pressure is greatly reduced mainly due to the decrease of the capillary pressure (Young-Laplace equation) caused by the contact angle change, while the contribution of the entrance energy barrier to the infiltration pressure, which is termed entrance barrier pressure, increases from 25% to 60%.

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Fluid transport in nanochannels induced by temperature gradients

Cited by 23 publications

References 29 publications

Wetting and motion behaviors of water droplet on graphene under thermal-electric coupling field

Wetting and motion behaviors of water droplet on graphene under thermal-electric coupling field

Thermal transpiration through single walled carbon nanotubes and graphene channels

Fluid infiltration pressure for hydrophobic nanochannels

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