Heat and Mass Transfer Processes and Evaporation of a Liquid Droplet on a Structured Surface
The characteristics of water droplet heating and evaporation on structured hydrophobic and hydrophilic surfaces in the range of static contact angles from 73° to 155° were studied experimentally using high-speed video recording. Two fundamentally different technologies for applying coatings on a met...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-11-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/16/22/7505 |
| _version_ | 1827640031135662080 |
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| author | Dmitrii V. Antonov Anastasia G. Islamova Evgeniya G. Orlova |
| author_facet | Dmitrii V. Antonov Anastasia G. Islamova Evgeniya G. Orlova |
| author_sort | Dmitrii V. Antonov |
| collection | DOAJ |
| description | The characteristics of water droplet heating and evaporation on structured hydrophobic and hydrophilic surfaces in the range of static contact angles from 73° to 155° were studied experimentally using high-speed video recording. Two fundamentally different technologies for applying coatings on a metal surface were used in comparison with the results on a polished surface. Microscopic studies were conducted to identify the features of the formed coatings. The wetting properties were characterized by means of the static contact angle and the contact angle hysteresis: on polished surface No. 1 (contact angle—73°, hysteresis—11°), on structured surface No. 2 (contact angle—125°, hysteresis—9°), and on structured surface No 3 (contact angle—155°, hysteresis—7°). The experimental dependences of the droplet evaporation rate on the different surfaces under normal conditions (ambient air temperature—293 K, atmospheric pressure, humidity—35%) were obtained. The evaporation regimes of droplets on the surfaces under study were identified. Water droplets evaporated in the pinning mode on surfaces No. 1 and No. 2. When a water droplet evaporated on surface No 3, the droplet was in the constant contact angle regime for ≈90% of its lifetime. Based on the experimental data obtained, a two-dimensional model of conjugate heat and mass transfer was developed, which describes the heating and evaporation of a liquid droplet on structured hydrophobic and hydrophilic surfaces at a wide range of contact angles. Satisfactory agreement was obtained between the numerical simulation results and experimental data. Using the model, the fields of temperature, concentration and other key characteristics were established at different points in time. Recommendations for its application in the development of gas–vapor–droplet applications were formulated. |
| first_indexed | 2024-03-09T16:52:20Z |
| format | Article |
| id | doaj.art-ef632568438a44eb9aff9b6d3b63c6bd |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-03-09T16:52:20Z |
| publishDate | 2023-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-ef632568438a44eb9aff9b6d3b63c6bd2023-11-24T14:40:01ZengMDPI AGEnergies1996-10732023-11-011622750510.3390/en16227505Heat and Mass Transfer Processes and Evaporation of a Liquid Droplet on a Structured SurfaceDmitrii V. Antonov0Anastasia G. Islamova1Evgeniya G. Orlova2Heat and Mass Transfer Laboratory, National Research Tomsk Polytechnic University, 30 Lenin Avenue, Tomsk 634050, RussiaHeat and Mass Transfer Laboratory, National Research Tomsk Polytechnic University, 30 Lenin Avenue, Tomsk 634050, RussiaHeat and Mass Transfer Laboratory, National Research Tomsk Polytechnic University, 30 Lenin Avenue, Tomsk 634050, RussiaThe characteristics of water droplet heating and evaporation on structured hydrophobic and hydrophilic surfaces in the range of static contact angles from 73° to 155° were studied experimentally using high-speed video recording. Two fundamentally different technologies for applying coatings on a metal surface were used in comparison with the results on a polished surface. Microscopic studies were conducted to identify the features of the formed coatings. The wetting properties were characterized by means of the static contact angle and the contact angle hysteresis: on polished surface No. 1 (contact angle—73°, hysteresis—11°), on structured surface No. 2 (contact angle—125°, hysteresis—9°), and on structured surface No 3 (contact angle—155°, hysteresis—7°). The experimental dependences of the droplet evaporation rate on the different surfaces under normal conditions (ambient air temperature—293 K, atmospheric pressure, humidity—35%) were obtained. The evaporation regimes of droplets on the surfaces under study were identified. Water droplets evaporated in the pinning mode on surfaces No. 1 and No. 2. When a water droplet evaporated on surface No 3, the droplet was in the constant contact angle regime for ≈90% of its lifetime. Based on the experimental data obtained, a two-dimensional model of conjugate heat and mass transfer was developed, which describes the heating and evaporation of a liquid droplet on structured hydrophobic and hydrophilic surfaces at a wide range of contact angles. Satisfactory agreement was obtained between the numerical simulation results and experimental data. Using the model, the fields of temperature, concentration and other key characteristics were established at different points in time. Recommendations for its application in the development of gas–vapor–droplet applications were formulated.https://www.mdpi.com/1996-1073/16/22/7505hydrophobic surfaceshydrophilic surfacessuperhydrophobic surfacesliquid dropletconjugate heat and mass transferevaporation |
| spellingShingle | Dmitrii V. Antonov Anastasia G. Islamova Evgeniya G. Orlova Heat and Mass Transfer Processes and Evaporation of a Liquid Droplet on a Structured Surface Energies hydrophobic surfaces hydrophilic surfaces superhydrophobic surfaces liquid droplet conjugate heat and mass transfer evaporation |
| title | Heat and Mass Transfer Processes and Evaporation of a Liquid Droplet on a Structured Surface |
| title_full | Heat and Mass Transfer Processes and Evaporation of a Liquid Droplet on a Structured Surface |
| title_fullStr | Heat and Mass Transfer Processes and Evaporation of a Liquid Droplet on a Structured Surface |
| title_full_unstemmed | Heat and Mass Transfer Processes and Evaporation of a Liquid Droplet on a Structured Surface |
| title_short | Heat and Mass Transfer Processes and Evaporation of a Liquid Droplet on a Structured Surface |
| title_sort | heat and mass transfer processes and evaporation of a liquid droplet on a structured surface |
| topic | hydrophobic surfaces hydrophilic surfaces superhydrophobic surfaces liquid droplet conjugate heat and mass transfer evaporation |
| url | https://www.mdpi.com/1996-1073/16/22/7505 |
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