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Research on Evaporation and Deposition Characteristics of Suspended Droplets Containing Nanoparticles
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Feng Gao, Yuanyuan Li, Gui Lu
Journal of Refrigeration | 2025, 46(4) : 97 - 105
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Journal of Refrigeration | 2025, 46(4): 97-105
Research on Evaporation and Deposition Characteristics of Suspended Droplets Containing Nanoparticles
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Feng Gao, Yuanyuan Li, Gui Lu
Affiliations
  • School of Energy Power and Mechanical Engineering, North China Electric Power University, Beijing, 102206, China
Published: 2025-08-16 doi: 10.12465/j.issn.0253-4339.2025.04.097
Outline
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Evaporation of functional nanoparticle-containing droplets on solid surfaces plays a key role in applications such as air conditioning, refrigeration, and electronic cooling. In this study, we experimentally investigated the evaporation behavior and particle deposition of nanofluid droplets on solid surfaces. The deposition patterns were photographed, and microscopic characterizations were performed. The results show that the droplets always evaporate in the mode of constant contact radius. Changes in substrate temperature and droplet volume have little influence on the evaporation mode and morphology of the droplets, and the contact angle changes linearly with time. The surfactant can significantly regulate the kinetic behavior of droplet spreading. The addition of only 0.25% of surfactant sodium dodecyl sulfate (SDS) increases the droplet spreading radius from 0.71 mm to 1.12 mm, decreases the initial contact angle from 83° to 54°, and increases the area of spreading by 89%. The substrate temperature and droplet volume significantly affect the deposition patterns after droplet evaporation. The higher the substrate temperature, the larger the droplet volume and the more obvious the coffee-ring pattern formed after evaporation. SDS significantly increases the coffee ring width, which reaches 230 μm when the mass fraction of SDS reaches 1.00%, and the particles have been widely distributed throughout the entire evaporation area, suggesting that the coffee ring effect has been effectively suppressed. By introducing the Ma number, the influence of the Marangoni effect, guided by temperature, volume, and mass fraction changes, on the internal flow of droplets and the mechanism of coffee-ring formation are explained.

nanofluids  /  droplet evaporation  /  particle self-assembly  /  coffee ring
Feng Gao, Yuanyuan Li, Gui Lu. Research on Evaporation and Deposition Characteristics of Suspended Droplets Containing Nanoparticles[J]. Journal of Refrigeration, 2025 , 46 (4) : 97 -105 . DOI: 10.12465/j.issn.0253-4339.2025.04.097
  • National Natural Science Foundation of China(52076074)
  • National Natural Science Foundation of China(52376008)
Year 2025 volume 46 Issue 4
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Article Info
doi: 10.12465/j.issn.0253-4339.2025.04.097
  • Receive Date:2024-05-13
  • Online Date:2026-03-13
  • Published:2025-08-16
Article Data
Affiliations
History
  • Received:2024-05-13
  • Revised:2024-05-29
  • Accepted:2024-05-30
Funding
National Natural Science Foundation of China(52076074)
National Natural Science Foundation of China(52376008)
Affiliations
    School of Energy Power and Mechanical Engineering, North China Electric Power University, Beijing, 102206, China

Corresponding:

Li Yuanyuan, female, professor, School of Energy Power and Mechanical Engineering, North China Electric Power University, 86-15810949982, E-mail: . Research fields: thermodynamics, thermal properties.
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表12种不同金属材料的力学参数

Family
属数
Number of
genus
种数
Number of
species
占总种数比例
Percentage of
total species (%)

Genus
种数
Number of
species
占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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