Heat-transfer enhancement and evaporation mechanisms on roughness-controlled wettability-contrast surfaces; International Journal of Heat and Mass Transfer; Vol. 260
| Parent link: | International Journal of Heat and Mass Transfer.— .— Amsterdam: Elsevier Science Publishing Company Inc. Vol. 260.— 2026.— Article number 128413, 29 p. |
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| Otros Autores: | , , , , , , |
| Sumario: | Title screen The problem of efficiently removing high heat fluxes (>100 W/cm2) from integrated circuits is particularly relevant. Its solution requires beyond heat-transfer surfaces with specified functional properties. In this study, the mechanisms of water droplet evaporation on biphilic aluminum heat-transfer surfaces with spatially controlled wetting regions were investigated. For this purpose, a novel approach for creating heat-transfer surfaces was developed based on a combination of laser processing of metal surfaces and hydrophobization by grafting alkyl groups (-CH2- and -CH3-) from oil thermolysis products to the textured surface. Experimental data on the influence of wettability, as an independent factor, on the droplet evaporation characteristics in the surface heating temperature range of 80–300 °C were obtained. Heat transfer mechanisms were studied using high-speed optical visualization, particle image velocimetry (PIV), and planar laser-induced fluorescence (PLIF). Direct temperature measurements were also conducted in the near-surface layer of the sample at a depth of 500 μm from the heat transfer surface using microscale thermocouples. The results show that slower evaporation on biphilic surfaces promotes enhanced local cooling. Wettability contrast induces complex internal thermocapillary (Marangoni) flows and significantly increases the length of the three-phase contact line due to the formation of air pockets under the droplet on superhydrophobic regions of the heat-transfer surface. At a temperature of 80 °C, biphilic surfaces with a superhydrophobic region fraction of 30–45 % provide a 79–81 % greater temperature reduction in the near-surface layer of the sample than a polished surface, despite a lower evaporation rate (29–74 % lower). Moreover, optimal wetting contrast shifts the maximum cooling efficiency to higher temperatures (160 °C versus 140 °C for a polished surface), thereby delaying the onset of the Leidenfrost effect. For surfaces combining high roughness (Sdr ≈ 700 %) with hydrophilic/superhydrophilic regions, the cooling efficiency at moderate temperatures increases up to 20 times Текстовый файл AM_Agreement |
| Lenguaje: | inglés |
| Publicado: |
2026
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| Materias: | |
| Acceso en línea: | https://doi.org/10.1016/j.ijheatmasstransfer.2026.128413 |
| Formato: | Electrónico Capítulo de libro |
| KOHA link: | https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=686477 |
MARC
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| 200 | 1 | |a Heat-transfer enhancement and evaporation mechanisms on roughness-controlled wettability-contrast surfaces |f D. V. Feoktistov, E. G. Orlova, E. Yu. Laga [et al.] | |
| 203 | |a Текст |b визуальный |c электронный | ||
| 283 | |a online_resource |2 RDAcarrier | ||
| 300 | |a Title screen | ||
| 320 | |a References: 66 tit | ||
| 330 | |a The problem of efficiently removing high heat fluxes (>100 W/cm2) from integrated circuits is particularly relevant. Its solution requires beyond heat-transfer surfaces with specified functional properties. In this study, the mechanisms of water droplet evaporation on biphilic aluminum heat-transfer surfaces with spatially controlled wetting regions were investigated. For this purpose, a novel approach for creating heat-transfer surfaces was developed based on a combination of laser processing of metal surfaces and hydrophobization by grafting alkyl groups (-CH2- and -CH3-) from oil thermolysis products to the textured surface. Experimental data on the influence of wettability, as an independent factor, on the droplet evaporation characteristics in the surface heating temperature range of 80–300 °C were obtained. Heat transfer mechanisms were studied using high-speed optical visualization, particle image velocimetry (PIV), and planar laser-induced fluorescence (PLIF). Direct temperature measurements were also conducted in the near-surface layer of the sample at a depth of 500 μm from the heat transfer surface using microscale thermocouples. The results show that slower evaporation on biphilic surfaces promotes enhanced local cooling. Wettability contrast induces complex internal thermocapillary (Marangoni) flows and significantly increases the length of the three-phase contact line due to the formation of air pockets under the droplet on superhydrophobic regions of the heat-transfer surface. At a temperature of 80 °C, biphilic surfaces with a superhydrophobic region fraction of 30–45 % provide a 79–81 % greater temperature reduction in the near-surface layer of the sample than a polished surface, despite a lower evaporation rate (29–74 % lower). Moreover, optimal wetting contrast shifts the maximum cooling efficiency to higher temperatures (160 °C versus 140 °C for a polished surface), thereby delaying the onset of the Leidenfrost effect. For surfaces combining high roughness (Sdr ≈ 700 %) with hydrophilic/superhydrophilic regions, the cooling efficiency at moderate temperatures increases up to 20 times | ||
| 336 | |a Текстовый файл | ||
| 371 | 0 | |a AM_Agreement | |
| 461 | 1 | |t International Journal of Heat and Mass Transfer |c Amsterdam |n Elsevier Science Publishing Company Inc. | |
| 463 | 1 | |t Vol. 260 |v Article number 128413, 29 p. |d 2026 | |
| 610 | 1 | |a электронный ресурс | |
| 610 | 1 | |a труды учёных ТПУ | |
| 610 | 1 | |a Droplet | |
| 610 | 1 | |a Evaporation | |
| 610 | 1 | |a Laser texturing | |
| 610 | 1 | |a Contrast wettability | |
| 610 | 1 | |a Cooling phenomenon | |
| 701 | 1 | |a Feoktistov |b D. V. |c Specialist in the field of thermal engineering |c Associate Professor; Deputy Director of Tomsk Polytechnic University, Candidate of technical sciences |f 1983- |g Dmitriy Vladimirovich |9 17698 | |
| 701 | 1 | |a Orlova |b E. G. |c specialist in the field of thermal engineering |c Associate Professor of Tomsk Polytechnic University, Candidate of Physical and Mathematical Sciences |f 1991- |g Evgeniya Georgievna |9 17697 | |
| 701 | 1 | |a Laga |b E. Yu. |c physicist |c Engineer of Tomsk Polytechnic University |f 1992- |g Ekaterina Yurjevna |9 88616 | |
| 701 | 1 | |a Klepikov |b D. M. |g Dmitry Mikhaylovich | |
| 701 | 1 | |a Paushkina |b K. K. |c specialist in the field of heat and power engineering |c Engineer of Tomsk Polytechnic University, assistant |f 1998- |g Kristina Konstantinovna |9 22949 | |
| 701 | 1 | |a Pleshko |g Andrey Olegovich |b A. O. |f 1998- |c specialist in the field of heat and power engineering and thermal engineering |c Assistant of assistant of the department Tomsk Polytechnic University |9 88770 | |
| 701 | 1 | |a Glushkov |b D. O. |c specialist in the field of power engineering |c Professor, Director of the ISHFVP of the Tomsk Polytechnic University, Doctor of Technical Sciences |f 1988- |g Dmitry Olegovich |9 16419 | |
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