Flow boiling of water in a microchannel: The effects of surface wettability on two-phase pressure drop
| Autor: | Jérôme Gavillet, Philippe Marty, Nadia Caney, Hai Trieu Phan, Stéphane Colasson |
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| Přispěvatelé: | Laboratoire des Écoulements Géophysiques et Industriels [Grenoble] (LEGI), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF), Laboratoire d'Innovation pour les Technologies des Energies Nouvelles et les nanomatériaux (LITEN), Institut National de L'Energie Solaire (INES), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Laboratoire Systèmes Thermiques (Greth/LETH), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS), Laboratoire Systèmes Thermiques (GRETh/LETH), Université Joseph Fourier - Grenoble 1 (UJF) |
| Jazyk: | angličtina |
| Rok vydání: | 2011 |
| Předmět: |
Engineering drawing
Materials science 020209 energy Energy Engineering and Power Technology 02 engineering and technology Industrial and Manufacturing Engineering Surface tension Contact angle Boiling 0202 electrical engineering electronic engineering information engineering microchannel Composite material contact angle pressure drop nanocoating Pressure drop Atmospheric pressure flow boiling 021001 nanoscience & nanotechnology surface wettability Subcooling Heat flux Contact angle Flow boiling Pressure drop Microchannel Nanocoating Surface wettability [PHYS.MECA.THER]Physics [physics]/Mechanics [physics]/Thermics [physics.class-ph] [SPI.MECA.THER]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Thermics [physics.class-ph] Wetting 0210 nano-technology |
| Zdroj: | Applied Thermal Engineering Applied Thermal Engineering, Elsevier, 2011, 31, pp.1894-1905. ⟨10.1016/j.applthermaleng.2011.02.036⟩ Applied Thermal Engineering, 2011, 31, pp.1894-1905. ⟨10.1016/j.applthermaleng.2011.02.036⟩ Applied Thermal Engineering, Elsevier, 2011, ⟨10.1016/j.applthermaleng.2011.02.036⟩ |
| ISSN: | 1359-4311 |
| DOI: | 10.1016/j.applthermaleng.2011.02.036⟩ |
| Popis: | International audience; Experiments were performed to study the effects of surface wettability on two-phase pressure drop of flow boiling of water at atmospheric pressure. The test channel is a single rectangular channel 0.5 mm high, 5 mm wide and 180 mm long. The mass flux was set at 100 kg/m2 s and 120 kg/m2 s, respectively. The base heat flux varied from 30 to 80 kW/m2. Water enters the test channel under subcooled conditions. The study has been performed at low exit vapour quality (less than 0.1). The samples are either hydrophilic like Polydimethylsiloxane (SiOx), Titanium (Ti), Diamond-Like Carbon (DLC) or hydrophobic like Polydimethylsiloxane (SiOC). These surfaces have static contact angles of 26 , 49 , 63 and 103 , respectively. It was observed that the total two-phase pressure drop significantly increases with the static contact angle. In particular, the average deviation between the highly-wetted and the unwetted surfaces is about 170%. To explain this observation, the "wetting pressure drop" notion caused by the surface tension forces generated at the triple contact lines is introduced. Afterwards, a model is proposed to predict the wetting pressure drop as a function of the static contact angle. This model shows a good agreement with the experimental data with 86% of the data included within the lines of 20% error. |
| Databáze: | OpenAIRE |
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