The Experts below are selected from a list of 6 Experts worldwide ranked by ideXlab platform
Yongping Chen - One of the best experts on this subject based on the ideXlab platform.
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role of surface roughness on thermal conductance at Liquid solid interfaces
International Journal of Heat and Mass Transfer, 2014Co-Authors: Yongping Chen, Chengbin ZhangAbstract:Abstract The fractal Cantor structure is introduced to characterize the surface topography of solid wall. By this fractal characterization, a molecular dynamics simulation of heat conduction in rough nanochannels is conducted to investigate how surface topography affects the thermal conductance at Liquid–solid interfaces. The role of surface roughness on temperature profiles, Liquid Atom trajectories, interfacial interaction energy and interfacial conductance are all examined and analyzed. The results indicate that, the temperature jump at Liquid–solid interfaces is observed irrespective of surface condition, and the existence of surface roughness reduces the interfacial temperature jump. When compared with smooth surface, the presence of surface roughness diminishes the motion capability of Liquid Atoms in the wall-neighboring region and these Atoms could maintain contact with the solid surface for a long time, which intensifies the energy transfer between the Liquids and solid surface and hence contribute to large thermal conductance at a Liquid–solid interface. Interestingly, it is found that the thermal conductance at a rough Liquid–solid interface is affected by more than just statistical roughness height, but also fractal dimension (topographical irregularity). In addition, increases in Liquid–solid interaction strength, roughness height and fractal dimension are all beneficial to enhance thermal conduction at Liquid–solid interfaces. In particular, a longer trapping time of Liquid Atoms inside the valley of the fractal surfaces is observed for a larger fractal dimension.
Chengbin Zhang - One of the best experts on this subject based on the ideXlab platform.
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role of surface roughness on thermal conductance at Liquid solid interfaces
International Journal of Heat and Mass Transfer, 2014Co-Authors: Yongping Chen, Chengbin ZhangAbstract:Abstract The fractal Cantor structure is introduced to characterize the surface topography of solid wall. By this fractal characterization, a molecular dynamics simulation of heat conduction in rough nanochannels is conducted to investigate how surface topography affects the thermal conductance at Liquid–solid interfaces. The role of surface roughness on temperature profiles, Liquid Atom trajectories, interfacial interaction energy and interfacial conductance are all examined and analyzed. The results indicate that, the temperature jump at Liquid–solid interfaces is observed irrespective of surface condition, and the existence of surface roughness reduces the interfacial temperature jump. When compared with smooth surface, the presence of surface roughness diminishes the motion capability of Liquid Atoms in the wall-neighboring region and these Atoms could maintain contact with the solid surface for a long time, which intensifies the energy transfer between the Liquids and solid surface and hence contribute to large thermal conductance at a Liquid–solid interface. Interestingly, it is found that the thermal conductance at a rough Liquid–solid interface is affected by more than just statistical roughness height, but also fractal dimension (topographical irregularity). In addition, increases in Liquid–solid interaction strength, roughness height and fractal dimension are all beneficial to enhance thermal conduction at Liquid–solid interfaces. In particular, a longer trapping time of Liquid Atoms inside the valley of the fractal surfaces is observed for a larger fractal dimension.
Dongxu Han - One of the best experts on this subject based on the ideXlab platform.
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nanoscale study of bubble nucleation on a cavity substrate using molecular dynamics simulation
Langmuir, 2018Co-Authors: Yujie Chen, Dongliang Sun, Yu Zou, Dongxu HanAbstract:In this paper, the molecular dynamics simulation method is utilized to investigate the phase transition behavior of an argon film placed on cavity substrates with different wettability conditions. A simple Lennard-Jones Liquid is heated by a metal platinum substrate at different temperatures, and a complete process of bubble nucleation is successfully visualized on the cavity substrate at temperatures of 150 and 160 K. Moreover, the bubble nucleation behavior shows dependence on cavity wettability. A layer of Liquid Atom is attracted to the strongly hydrophilic cavity and obtains more energy to nucleate first. In contrast, the Liquid Atom suffers a large repulsive force from the metal Atom in the hydrophobic cavity, thus an original small bubble nucleus stably stays inside before the incipient boiling time. With an increase in the heating time, the original bubble nucleus grows up from the hydrophobic cavity. This bubble nucleation behavior on a hydrophobic cavity is in agreement with macro theory, which ...
Yujie Chen - One of the best experts on this subject based on the ideXlab platform.
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nanoscale study of bubble nucleation on a cavity substrate using molecular dynamics simulation
Langmuir, 2018Co-Authors: Yujie Chen, Dongliang Sun, Yu Zou, Dongxu HanAbstract:In this paper, the molecular dynamics simulation method is utilized to investigate the phase transition behavior of an argon film placed on cavity substrates with different wettability conditions. A simple Lennard-Jones Liquid is heated by a metal platinum substrate at different temperatures, and a complete process of bubble nucleation is successfully visualized on the cavity substrate at temperatures of 150 and 160 K. Moreover, the bubble nucleation behavior shows dependence on cavity wettability. A layer of Liquid Atom is attracted to the strongly hydrophilic cavity and obtains more energy to nucleate first. In contrast, the Liquid Atom suffers a large repulsive force from the metal Atom in the hydrophobic cavity, thus an original small bubble nucleus stably stays inside before the incipient boiling time. With an increase in the heating time, the original bubble nucleus grows up from the hydrophobic cavity. This bubble nucleation behavior on a hydrophobic cavity is in agreement with macro theory, which ...
Dongliang Sun - One of the best experts on this subject based on the ideXlab platform.
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nanoscale study of bubble nucleation on a cavity substrate using molecular dynamics simulation
Langmuir, 2018Co-Authors: Yujie Chen, Dongliang Sun, Yu Zou, Dongxu HanAbstract:In this paper, the molecular dynamics simulation method is utilized to investigate the phase transition behavior of an argon film placed on cavity substrates with different wettability conditions. A simple Lennard-Jones Liquid is heated by a metal platinum substrate at different temperatures, and a complete process of bubble nucleation is successfully visualized on the cavity substrate at temperatures of 150 and 160 K. Moreover, the bubble nucleation behavior shows dependence on cavity wettability. A layer of Liquid Atom is attracted to the strongly hydrophilic cavity and obtains more energy to nucleate first. In contrast, the Liquid Atom suffers a large repulsive force from the metal Atom in the hydrophobic cavity, thus an original small bubble nucleus stably stays inside before the incipient boiling time. With an increase in the heating time, the original bubble nucleus grows up from the hydrophobic cavity. This bubble nucleation behavior on a hydrophobic cavity is in agreement with macro theory, which ...