期刊
JOURNAL OF MOLECULAR LIQUIDS
卷 364, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.molliq.2022.119925
关键词
Thermal behavior; Hydrophilic surface; Hydrophobic surface; Molecular dynamics simulation; Nanofluid
资金
- 2021 Scientific Research Fund project of Liaoning Provincial Education Department Study on the development of compound juice of small berry and its quality change during storage [LJKZ1127]
- Research and development of complex energy-saving and thermoelectric regenerative systems [FZWG-2020-0034]
This study investigates the thermal and atomic behavior of ammonia/copper nanofluid in aluminum nanochannels with different surface coatings. The results show that hydrophilic surfaces improve the thermal behavior and reduce the phase change time of the nanofluid.
The formation of hydrophilic (HPI) and hydrophobic (HPO) surfaces on the walls of simulated aluminum nanochannels (NC) directly affects the thermal behavior and atomic behavior of nanofluid (NF) flows. In the present study, the thermal behavior and atomic behavior of ammonia/Cu NF in an aluminum NC with the walls that covered with HPI (TiO2) surface, HPO surface (Carboxylic acid), and a combination of these two atomic structures were studied using molecular dynamics simulation (MDS). The quantities of phase change time (PCT), aggregation time (AT) of nanoparticles (NPs), and thermal conductivity (TC) are stud-ied to examine the atomic behavior and thermal behavior of structures. The simulated structure has a higher density (D) in the presence of HPI surface than HPO surface and combined surfaces. Also, using HPI surfaces on the inner surface of aluminum NCs, condensed particles were reduced to 71 % in 2.83 ns, which shows the highest percentage of phase-changed particles in the shortest time. Also, the HPI surface leads to an increase in the TC and AT. According to this simulation, the presence of HPI sur-faces improves the thermal behavior of ammonia/Cu NF.(c) 2022 Elsevier B.V. All rights reserved.
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