Drop Spreading and Evaporation on a Heated Substrate Under Variable Gravity Conditions
| Parent link: | 15th International Heat Transfer Conference (IHTC-15): 2014, 10-15 August, Kyoto, Japan. [009504, 15 p.].— , 2014 |
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| Autor Corporativo: | |
| Outros Autores: | , , , , , , , , |
| Resumo: | Title screen In the last decade, evaporation of sessile drops has become an important subject for research in normal gravity and microgravity conditions. We present results of experimental and theoretical study of the evaporation of a sessile water drop to open atmosphere when the temperature difference between the solid substrate and the atmosphere is up to 50?C. Using substrates with different wettability (Spin Teflon, Spray Teflon, HMDS, Anodized Aluminum) we investigate all three modes of drop evaporation: pinning, partial pinning and depinning. One of the main results is that at the final stage of the drop life the specific evaporation rate abruptly increases especially for drops with small and moderate contact angle hysteresis (CAH). The data are compared with two types of models. First one is based on thin layer approximation and valid for drops with small contact angles (CA); the second one is a coupled heat and mass transfer quasi-stationary model valid for any CA. The calculated specific evaporation rate is in good agreement with the experimental data. We also present experimental and theoretical results on the dynamics of sessile water drops, obtained under normal gravity (1g), microgravity (?g) and hypergravity (up to 20g). The microgravity experiments were conducted during the Parabolic Flight campaigns of the European Space Agency. The hypergravity experiment was carried out on the ESA Large Diameter Centrifuge. The goal is to study the effect of the gravity on 1) the shape of a static sessile drop; and 2) on the dynamic advancing CA in a growing sessile drop. Eleven different smooth and rough surfaces are used, with different CA and different CAH. Water is used as the working liquid. The main variable parameters are: temperature (20-80?C); gravity (µg–20g); drop volume (1µl–5ml); liquid flow rate (0.06–16 ml/min); CA (30–130?). The drop shape is visualized from the top with the help of the Phase Schlieren System, and from the side with the help of the shadow technique with resolution of 6 µm/pix. The spreading of a sessile liquid drop under the effect of gravity has been experimentally observed on surfaces with low CAH. In this case good agreement is obtained between the experiment and modeling. For surfaces with high CAH the contact line is pinned while CA adjusts for different gravity levels. The dynamic advancing CA is found to increase with the gravity. |
| Idioma: | inglês |
| Publicado em: |
2014
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| Assuntos: | |
| Acesso em linha: | http://dx.doi.org/10.1615/IHTC15.evp.009504 |
| Formato: | Recurso Eletrônico Capítulo de Livro |
| KOHA link: | https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=650144 |
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| 200 | 1 | |a Drop Spreading and Evaporation on a Heated Substrate Under Variable Gravity Conditions |f O. A. Kabov [et al.] | |
| 203 | |a Text |c electronic | ||
| 300 | |a Title screen | ||
| 330 | |a In the last decade, evaporation of sessile drops has become an important subject for research in normal gravity and microgravity conditions. We present results of experimental and theoretical study of the evaporation of a sessile water drop to open atmosphere when the temperature difference between the solid substrate and the atmosphere is up to 50?C. Using substrates with different wettability (Spin Teflon, Spray Teflon, HMDS, Anodized Aluminum) we investigate all three modes of drop evaporation: pinning, partial pinning and depinning. One of the main results is that at the final stage of the drop life the specific evaporation rate abruptly increases especially for drops with small and moderate contact angle hysteresis (CAH). The data are compared with two types of models. First one is based on thin layer approximation and valid for drops with small contact angles (CA); the second one is a coupled heat and mass transfer quasi-stationary model valid for any CA. The calculated specific evaporation rate is in good agreement with the experimental data. We also present experimental and theoretical results on the dynamics of sessile water drops, obtained under normal gravity (1g), microgravity (?g) and hypergravity (up to 20g). | ||
| 330 | |a The microgravity experiments were conducted during the Parabolic Flight campaigns of the European Space Agency. The hypergravity experiment was carried out on the ESA Large Diameter Centrifuge. The goal is to study the effect of the gravity on 1) the shape of a static sessile drop; and 2) on the dynamic advancing CA in a growing sessile drop. Eleven different smooth and rough surfaces are used, with different CA and different CAH. Water is used as the working liquid. The main variable parameters are: temperature (20-80?C); gravity (µg–20g); drop volume (1µl–5ml); liquid flow rate (0.06–16 ml/min); CA (30–130?). The drop shape is visualized from the top with the help of the Phase Schlieren System, and from the side with the help of the shadow technique with resolution of 6 µm/pix. The spreading of a sessile liquid drop under the effect of gravity has been experimentally observed on surfaces with low CAH. In this case good agreement is obtained between the experiment and modeling. For surfaces with high CAH the contact line is pinned while CA adjusts for different gravity levels. The dynamic advancing CA is found to increase with the gravity. | ||
| 463 | |t 15th International Heat Transfer Conference (IHTC-15) |o 2014, 10-15 August, Kyoto, Japan |v [009504, 15 p.] |d 2014 | ||
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| 610 | 1 | |a кипение | |
| 610 | 1 | |a испарение | |
| 610 | 1 | |a двухфазные потоки | |
| 610 | 1 | |a многофазные потоки | |
| 610 | 1 | |a микрогравитация | |
| 610 | 1 | |a гипергравитация | |
| 610 | 1 | |a условия | |
| 701 | 1 | |a Kabov |b O. A. |c specialist in the field of thermal engineering |c Professor of Tomsk Polytechnic University, doctor of physical and mathematical Sciences |f 1956- |g Oleg Aleksandrovich |3 (RuTPU)RU\TPU\pers\35151 | |
| 701 | 1 | |a Zaytsev |b D. V. |g Dmitry Valerjevich | |
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| 701 | 1 | |a Semenov |b A. A. |g Andrey Aleksandrovich | |
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| 701 | 1 | |a Ajaev |b V. S. |g Vladimir Sergeevich | |
| 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 |3 (RuTPU)RU\TPU\pers\34158 |9 17698 | |
| 701 | 1 | |a Kuznetsov |b G. V. |c Specialist in the field of heat power energy |c Professor of Tomsk Polytechnic University, Doctor of Physical and Mathematical Sciences |f 1949- |g Geny Vladimirovich |3 (RuTPU)RU\TPU\pers\31891 |9 15963 | |
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