A molecular dynamics investigation on effects of nanostructures on thermal conductance across a nanochannel

Lin, Tao; Li, J.; Quan, Xiaojun; Cheng, Ping

doi:10.1016/j.icheatmasstransfer.2018.05.025

Cited by 17 publications

(5 citation statements)

References 29 publications

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“…This is because the ITR on the flat surface is usually higher than that on the nano-structured surface. [44] For ∆ > 0, the temperature of the bulk liquid is close to the high temperature (T L > T R ), which results in a high liquid pressure, as shown in Fig. 6 (wherein the average temperature T and pressure P of the bulk liquid are plotted).…”

Section: Mechanism For Thermal Rectificationmentioning

confidence: 92%

“…Here, the liquid temperature profile is lengthened to the interface, and the temperature difference ∆ T is defined as the difference between the solid temperature and the extended liquid temperature. [44] The thermal resistance of the solid can be neglected owing to its high thermal conductivity with respect to the thermal conductivity of a fluid. As shown in Fig.…”

Section: Mechanism For Thermal Rectificationmentioning

confidence: 99%

“…[38][39][40] For solid-liquid interfacial thermal transport, the interfacial thermal resistance (ITR) plays an important role, which depends on the interfacial properties. [41][42][43][44][45][46][47][48] For a solid-liquid interface with nanostruc-tured groves on the surface, its wettability state can be in the Cassie state and Wenzel state, depending on whether liquid molecules enter into the nanogrooves. [49][50][51] For the Cassie state, there are almost no fluid molecules inside the grooves; while for the Wenzel state, all grooves are filled with fluid molecules.…”

Section: Introductionmentioning

confidence: 99%

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Thermal rectification induced by Wenzel–Cassie wetting state transition on nano-structured solid–liquid interfaces

Li¹,

Wang²

2023

Chinese Phys. B

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Thermal rectification refers to the phenomenon by which the magnitude of the heat flux in one direction is much larger than that in the opposite direction. In this study, we propose to implement the thermal rectification phenomenon in an asymmetric solid-liquid-solid sandwiched system with a nano-structured interface. By using the non-equilibrium molecular dynamics simulations, the thermal transport through the solid-liquid-solid system is examined, and the thermal rectification phenomenon can be observed. It is revealed that the thermal rectification effect can be attributed to the significant difference in the interfacial thermal resistance between Cassie and Wenzel states when reversing the temperature bias. In addition, the effect of the liquid density, solid-liquid bonding strength and nanostructure size on the thermal rectification is also examined. The findings in this paper provide a new way for the design of certain thermal devices.

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Section: Mechanism For Thermal Rectificationmentioning

confidence: 92%

Section: Mechanism For Thermal Rectificationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Thermal rectification induced by Wenzel–Cassie wetting state transition on nano-structured solid–liquid interfaces

Li¹,

Wang²

2023

Chinese Phys. B

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“…The similar size is used in the MD simulation for the heat transfer process across the solid-gas or solid-liquid interface. [22,30] Then the shape of the surface roughness can be sinusoidal function, triangle and rectangle. [31][32][33] To mimic the experimental sample, [34] we use a rectangular pore on the surface of the YSZ to represent the surface roughness.…”

Section: Structure and Simulation Detailsmentioning

confidence: 99%

Solid–gas interface thermal conductance for the thermal barrier coating with surface roughness: The confinement effect

Zhao

Jiang²

2022

Chinese Phys. B

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The yttria-stabilized zirconia (YSZ) is a famous thermal barrier coating material to protect hot-end components of the engine. As a characteristic feature of the YSZ, the surface roughness shall play an important role in the interface thermal conductance between the YSZ and gas, considering that the gas is typically at an extremely high temperature. We investigate the effect of the surface roughness on the thermal conductance of the YSZ-gas interface with surface roughness described by nanoscale pores on the surface of the YSZ. We reveal two competitive mechanisms related to the microstructure of the pore, i.e., the actual contact area effect and the confinement effect. The increase of the pore depth will enlarge the actual contact area between the YSZ and gas, leading to the enhancement of the solid-gas interface thermal conductance. In contrast to the positive actual contact area effect, the geometry-induced confinement effect greatly reduces the interface thermal conductance. These findings shall offer some fundamental understandings for the microscopic mechanisms of the YSZ-gas interface thermal conductance.

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“…The nanoscale heat transfer at the solid-liquid interface can be manipulated by surface wettability, [27][28][29][30] nanostructure, [31][32][33][34][35] surfactant adsorption, [36][37][38] self-assembled monolayer, [39][40][41] atomic surface terminations, 42 nanoparticles, 43 temperature, 44,45 and liquid pressure. 46,47 The thermal conductivity of an ordered liquid layer adjacent to the solid surface increases compared with that of bulk liquid.…”

Section: Introductionmentioning

confidence: 99%

Quasi-Casimir coupling can induce thermal resonance of adsorbed liquid layers in a nanogap

Chen

Nagayama

2022

Phys. Chem. Chem. Phys.

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A molecular dynamics investigation on effects of nanostructures on thermal conductance across a nanochannel

Cited by 17 publications

References 29 publications

Thermal rectification induced by Wenzel–Cassie wetting state transition on nano-structured solid–liquid interfaces

Thermal rectification induced by Wenzel–Cassie wetting state transition on nano-structured solid–liquid interfaces

Solid–gas interface thermal conductance for the thermal barrier coating with surface roughness: The confinement effect

Quasi-Casimir coupling can induce thermal resonance of adsorbed liquid layers in a nanogap

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