Molecular dynamics simulation on the microstructure of absorption layer at the liquid–solid interface in nanofluids

Cui, Wenzheng; Shen, Zhaojie; Yang, Jianguo; Wu, Shaohua

doi:10.1016/j.icheatmasstransfer.2015.12.023

Cited by 57 publications

(17 citation statements)

References 37 publications

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“…Wang et al [23] have explained it satisfactorily. They reported that for a confined monolayer of liquid, the thermal boundary resistance dropped by one order of magnitude compared to larger gap thickness [23], which was also supported by the earlier works of Liang and Tsai [22] and Cui et al [35]. A smaller thermal boundary resistance perpetuates easy flow of thermal energy, decreasing its heat capacity compared to the bulk counterpart.…”

Section: Effect Of Gap Thickness On Heat Capacitymentioning

confidence: 57%

“…This absorbed liquid layer, with much lower mobility compared to the rest of the liquid molecules, is termed as a 'Solid-like-liquid' region as indicated in Figure 3a. Cui et al [35] have reported an entirely different microstructure of such layers absorbed onto the solid walls compared to the bulk liquid. They showed that these layers were more ordered, and close enough to that of the solid material.…”

Section: Effect Of Gap Thickness On Heat Capacitymentioning

confidence: 99%

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Enhanced Specific Heat Capacity of Liquid Entrapped between Two Solid Walls Separated by a Nanogap

2020

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Size and thermal effect on molar heat capacity of liquid at constant volume (Cv) on a nanometer scale have been investigated by controlling the temperature and density of the liquid domain using equilibrium molecular dynamics (EMD) simulations. Lennard-Jones (LJ) type molecular model with confinement gap thickness (h) 0.585 nm to 27.8 nm has been used with the temperature (T) ranging from 100 K to 140 K. The simulation results revealed that the heat capacity of the nanoconfined liquid surpasses that of the bulk liquid within a defined interval of gap thickness; that the temperature at which maximum heat capacity occurs for a nanoconfined liquid vary with gap thickness following a power law, TCv,max = 193.4 × (h/a)−0.3431, ‘a’ being the lattice constant of Argon (solid) at 300 K; and that for a specified gap thickness and temperature, the confined liquid can exhibit a heat capacity that can be more than twice the heat capacity of the bulk liquid. The increase in heat capacity is underpinned by an increase in non-configurational (phonon and anharmonic modes of vibration) and configurational (non-uniform density distribution, enhanced thermal resistance, guided molecular mobility, etc.) contributions.

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Section: Effect Of Gap Thickness On Heat Capacitymentioning

confidence: 57%

Section: Effect Of Gap Thickness On Heat Capacitymentioning

confidence: 99%

Enhanced Specific Heat Capacity of Liquid Entrapped between Two Solid Walls Separated by a Nanogap

2020

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“…when the gap thickness falls below 0.88 nm, C v of the confined liquid becomes slightly lower than the bulk liquid. This was explained by Wang et al [9], Cui et al [30] and Liang and Tsai [26] earlier as the thermal boundary resistance becomes one magnitude smaller compared to larger gap thickness when the confinement contains only one atomic nanolayer.…”

Section: Resultsmentioning

confidence: 94%

Atomistic simulation of size‐dependent heat capacity of liquid in molecular scale confinement at different temperatures

Mahmud

Morshed²,

Paul

2019

Micro & Nano Letters

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An enhancement of heat capacity (C v) of nanoconfined liquid is reported using equilibrium molecular dynamics simulations using Lennard-Jones type solid-liquid molecular model. Liquid molecules are confined in between two solid surfaces with separation distance varying from 0.6 to 17.55 nm and temperature 100 K to 140 K. The obtained heat capacity of the bulk liquid is in excellent agreement with the published literature. However, in case of nanoconfined liquid, for a particular temperature and gap thickness band, a significant enhancement of heat capacity results in. For 100 K temperature and a gap thickness of 4 nm, the obtained molar heat capacity of the nanoconfined liquid is 46.45 J/mol K, i.e. the heat capacity is enhanced by 133% compared to its bulk counterpart (19.95 J/mol K). However, this broad maximum value of heat capacity shifts to a lower value at a higher temperature. At 120 and 140 K, the maximum heat capacity becomes 29.56 and 26.97 J/mol.K and the enhancement becomes 51% and 40%, respectively. The enhancement of heat capacity is attributed to the variation in density distribution, ballistic transport of thermal phonons, reduced molecular motion and a larger contribution of interfacial thermal resistance.

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“…Zhao et al [63] indicated that the electric double layer has an important influence on the flow and heat transfer in the microchannel by using homotopy analysis methods. From the molecular dynamics results, Cui et al [64] found that the specific surface area and the electric double layer should be taken into account when the particle size affects the thermal conductivity. Mitiche et al [65] investigated the effect of the interface layers in enhancing the heat transfer performance of Cu-Ar nanofluids with the linear response theory and equilibrium molecular dynamics simulations.…”

Section: Introductionmentioning

confidence: 99%

A Review on Heat Transfer of Nanofluids by Applied Electric Field or Magnetic Field

et al. 2020

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Nanofluids are considered to be a next-generation heat transfer medium due to their excellent thermal performance. To investigate the effect of electric fields and magnetic fields on heat transfer of nanofluids, this paper analyzes the mechanism of thermal conductivity enhancement of nanofluids, the chaotic convection and the heat transfer enhancement of nanofluids in the presence of an applied electric field or magnetic field through the method of literature review. The studies we searched showed that applied electric field and magnetic field can significantly affect the heat transfer performance of nanofluids, although there are still many different opinions about the effect and mechanism of heat transfer. In a word, this review is supposed to be useful for the researchers who want to understand the research state of heat transfer of nanofluids.

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Molecular dynamics simulation on the microstructure of absorption layer at the liquid–solid interface in nanofluids

Cited by 57 publications

References 37 publications

Enhanced Specific Heat Capacity of Liquid Entrapped between Two Solid Walls Separated by a Nanogap

Enhanced Specific Heat Capacity of Liquid Entrapped between Two Solid Walls Separated by a Nanogap

Atomistic simulation of size‐dependent heat capacity of liquid in molecular scale confinement at different temperatures

A Review on Heat Transfer of Nanofluids by Applied Electric Field or Magnetic Field

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