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10 results on '"Hai Trieu Phan"'

1. A model to predict the effect of surface wettability on critical heat flux

Author

Stéphane Colasson, Nadia Caney, Rémi Bertossi, Hai Trieu Phan, Philippe Marty, Laboratoire des Écoulements Géophysiques et Industriels [Grenoble] (LEGI), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS), 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), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF), and Laboratoire Systèmes Thermiques (Greth/LETH)

Subjects
Materials science, General Chemical Engineering, Thermal resistance, wettability, Thermodynamics, 02 engineering and technology, Heat transfer coefficient, 01 natural sciences, 010305 fluids & plasmas, Physics::Fluid Dynamics, Boiling, 0103 physical sciences, Contact angle, Critical heat flux, Thermal contact, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Atomic and Molecular Physics, and Optics, Heat flux, Pool boiling, Heat transfer, [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], 0210 nano-technology, Nucleate boiling
Abstract

International audience; Critical heat flux (CHF) in pool boiling experiments corresponds to the heat flux at which a vapor film is formed on the heated surface resulting from the replacement of liquid by vapor adjacent to this surface. Poor thermal conductivity of vapor can severely deteriorate heat transfer. It is important that systems operate below this limit which is a strong limitation to heat transfer due to the huge increase of the thermal resistance near the wall. The concept of macro- and micro-contact angles has been introduced in a previous paper (Phan et al., 2010 [28]) to describe the bubble growth processes. In this paper, an explicit relation between the bubble departure diameter and the contact angle has been presented. Based on these results, we propose a model of critical heat flux, taking into account the effects of the wettability of the fluid, whose property is known to strongly influence boiling heat transfer. A new correlation for CHF, dependent on the contact angle, is proposed. It is found in fair agreement with existing experimental results concerning subcooled boiling to describe the variation of CHF with wettability.

Published
2012
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2. How does surface wettability influence nucleate boiling?

Author

Jérôme Gavillet, Philippe Marty, Nadia Caney, Hai Trieu Phan, and Stéphane Colasson

Subjects
Marketing, Nanostructure, 020209 energy, Strategy and Management, Nucleation, Thermodynamics, 02 engineering and technology, 01 natural sciences, 010305 fluids & plasmas, Contact angle, Surface coating, Boiling, 0103 physical sciences, Heat transfer, 0202 electrical engineering, electronic engineering, information engineering, Media Technology, General Materials Science, Wetting, Nucleate boiling
Abstract

Although the boiling process has been a major subject of research for several decades, its physics still remain unclear and require further investigation. This study aims at highlighting the effects of surface wettability on pool boiling heat transfer. Nanocoating techniques were used to vary the water contact angle from 20 ◦ to 110 ◦ by modifying nanoscale surface topography and chemistry. The experimental results obtained disagree with the predictions of the classical models. A new approach of nucleation mechanism is established to clarify the nexus between the surface wettability and the nucleate boiling heat transfer. In this approach, we introduce the concept of macro- and micro-contact angles to explain the observed phenomenon. To cite this article: H.T. Phan et al., C. R. Mecanique 337 (2009).

Published
2009
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3. Flow Boiling of Water on Titanium and Diamond-like carbon coated Surfaces in a Microchannel

Author

Philippe Marty, Je´roˆme Gavillet, Hai Trieu Phan, Nadia Caney, Ste´phane Colasson, Laboratoire des Écoulements Géophysiques et Industriels [Grenoble] (LEGI), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS), 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), Commissariat à l'énergie atomique et aux énergies alternatives - Laboratoire d'Electronique et de Technologie de l'Information (CEA-LETI), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF), and Laboratoire Systèmes Thermiques (Greth/LETH)

Subjects
Materials science, Diamond-like carbon, 020209 energy, Thermodynamics, General Physics and Astronomy, chemistry.chemical_element, Heat transfer coefficient, 02 engineering and technology, 01 natural sciences, 010305 fluids & plasmas, Contact angle, boiling, Boiling, 0103 physical sciences, heat transfer, 0202 electrical engineering, electronic engineering, information engineering, General Materials Science, Composite material, 010306 general physics, contact angle, nanocoating, wetting, Microchannel, Critical heat flux, General Engineering, 021001 nanoscience & nanotechnology, Subcooling, Heat flux, chemistry, Heat transfer, [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], 0210 nano-technology, Nucleate boiling, Titanium
Abstract

International audience; Experiments were performed to study the effects of surface wettability on 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 and 120 kg/m² s and the base heat flux was varied from 30 to 80 kW/m². Water enters the test channel under subcooled conditions. The sample surfaces are titanium (Ti) and diamond-like carbon (DLC) surfaces having a contact angle of 49° and 63°, respectively. The experimental results show different flow patterns that impact the heat transfer significantly. Compared to the Ti surface, the DLC surface shows a deterioration of 10% in heat transfer.

Published
2011
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4. Flow boiling of water in a microchannel: The effects of surface wettability on two-phase pressure drop

Author

Jérôme Gavillet, Philippe Marty, Nadia Caney, Hai Trieu Phan, Stéphane Colasson, 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), and Université Joseph Fourier - Grenoble 1 (UJF)

Subjects
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
Abstract

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.

Published
2011
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5. Surface Coating with Nanofluids: The Effects on Pool Boiling Heat Transfer

Author

Philippe Marty, Nadia Caney, Stéphane Colasson, Hai Trieu Phan, Jérôme Gavillet, 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), Commissariat à l'énergie atomique et aux énergies alternatives - Laboratoire d'Electronique et de Technologie de l'Information (CEA-LETI), Direction de Recherche Technologique (CEA) (DRT (CEA)), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)

Subjects
pool boiling, Materials science, Critical heat flux, adhesion energy, 020209 energy, Heat transfer enhancement, Thermodynamics, wettability, 02 engineering and technology, Heat transfer coefficient, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Atomic and Molecular Physics, and Optics, Surface coating, Nanofluid, Chemical engineering, Mechanics of Materials, Boiling, Heat transfer, heat transfer, 0202 electrical engineering, electronic engineering, information engineering, General Materials Science, nanofluid, 0210 nano-technology, Nucleate boiling
Abstract

International audience; Recent research has confirmed a buildup of a thin layer of nanoparticles on the heated surface during nucleate boiling in nanofluids. Most of these studies report no change of heat transfer and, even worse, the presence of heat transfer deterioration. However, a few others report a heat transfer enhancement. In order to understand these controversial results, experiments were performed to explore the mechanism of surface coating during nucleate boiling in nanofluids. The thickness of the nanoparticle layer was observed to depend on the nanoparticles concentration and the experiment duration. Compared to a clean surface, the wettability of the surfaces with a TiO2 nanoparticle layer has been significantly improved. However, up to 50% of heat transfer coefficient deterioration was observed with TiO2-coated surfaces in water pool boiling. An explanation is proposed that involves the role of adhesion energy on heat transfer.

Published
2010
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6. A model to predict the effect of contact angle on the bubble departure diameter during heterogeneous boiling

Author

Jérôme Gavillet, Stéphane Colasson, Hai Trieu Phan, Philippe Marty, Nadia Caney, 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), Commissariat à l'énergie atomique et aux énergies alternatives - Laboratoire d'Electronique et de Technologie de l'Information (CEA-LETI), Direction de Recherche Technologique (CEA) (DRT (CEA)), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)

Subjects
Materials science, Meteorology, General Chemical Engineering, Bubble, Mechanics, Condensed Matter Physics, 01 natural sciences, Atomic and Molecular Physics, and Optics, 010305 fluids & plasmas, Contact angle, Physics::Fluid Dynamics, Boiling, 0103 physical sciences, Wettability, Current (fluid), Bubble departure, 010306 general physics
Abstract

International audience; Over the past eighty years, bubble release during heterogeneous boiling has been the subject of numerous investigations. However, current understanding of factors that influence this process is still incomplete. In this paper, a model is developed to describe the effect of contact angle on the bubble departure from an upward-facing horizontal surface. Based on the concept of macro- and micro-contact angles, this model gives an explicit theoretical relation between the bubble departure diameter and the contact angle. Agreement with previous experimental data confirms the predictive ability of the present model.

Published
2010
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7. Flow boiling of water on nanocoated surfaces in a microchannel

Author

Ste´phane Colasson, Philippe Marty, Je´roˆme Gavillet, Nadia Caney, Hai Trieu Phan, 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), and Laboratoire Systèmes Thermiques (GRETh/LETH)

Subjects
Mass flux, Materials science, 020209 energy, Analytical chemistry, FOS: Physical sciences, Thermodynamics, 02 engineering and technology, Heat transfer coefficient, convective boiling, 01 natural sciences, 010305 fluids & plasmas, Boiling, Latent heat, 0103 physical sciences, 0202 electrical engineering, electronic engineering, information engineering, General Materials Science, microchannel, Composite material, Silicon oxide, contact angle, nanocoating, Hydrology, Microchannel, Mechanical Engineering, Fluid Dynamics (physics.flu-dyn), Physics - Fluid Dynamics, 021001 nanoscience & nanotechnology, Condensed Matter Physics, surface wettability, Subcooling, Heat flux, Mechanics of Materials, Heat transfer, [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], 0210 nano-technology, Nucleate boiling
Abstract

Experiments were performed to study the effects of surface wettability on 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 the base heat flux varied from 30 to 80 kW/m2. Water enters the test channel under subcooled conditions. The samples are silicone oxide (SiOx), titanium (Ti), diamond-like carbon (DLC) and carbon-doped silicon oxide (SiOC) surfaces with static contact angles of 26{\deg}, 49{\deg}, 63{\deg} and 103{\deg}, respectively. The results show significant impacts of surface wettability on heat transfer coefficient., Comment: Papers in ICNMM10 conference, Montreal, Canada

Published
2010
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8. A new approach to understanding the effects of surface wettability on nucleate boiling

Author

Philippe Marty, Hai Trieu Phan, Nadia Caney, Stéphane Colasson, Jérôme Gavillet, 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), and Laboratoire Systèmes Thermiques (GRETh/LETH)

Subjects
Surface (mathematics), 020209 energy, Nucleation, Thermodynamics, 02 engineering and technology, Boiling heat transfer, 01 natural sciences, Industrial and Manufacturing Engineering, 010305 fluids & plasmas, Contact angle, boiling, 0103 physical sciences, heat transfer, 0202 electrical engineering, electronic engineering, information engineering, General Materials Science, contact angle, nanocoating, Mechanical Engineering, Mechanics, Heat transfer, Boiling process, 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, Nucleate boiling
Abstract

International audience; Although boiling process has been a major subject of research for several decades, its physics still remain unclear and require further investigation. This study aims at highlighting the effects of surface wettability on pool boiling heat transfer. Nanocoating techniques were used to vary the water contact angle from 20 to 110 ◦ by modifying nanoscale surface topography and chemistry. The experimental results obtained disagree with the predictions of the classical models. A new approach of nucleation mechanism is established to clarify the nexus between the surface wettability and the nucleate boiling heat transfer. In this approach, we introduce the concept of macro- and micro- contact angles to explain the observed phenomenon

Published
2009
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9. Effects of Surface Wettability on Heterogeneous Boiling

Author

Nadia Caney, Ste´phane Colasson, Je´roˆme Gavillet, Hai Trieu Phan, and Philippe Marty

Subjects
Surface (mathematics), Contact angle, Chemistry, Boiling, Heat transfer, Nanoscale Phenomena, Nucleation, Thermodynamics, Mechanics, Wetting, Nucleate boiling
Abstract

Although boiling process has been a major subject of research for several decades, its physics still remain unclear and require further investigation. This study aims at highlighting the effects of the surface wettability on pool boiling heat transfer. Nanocoating techniques were used to vary the water contact angle from 20 to 110° by modifying nanoscale surface topography and chemistry. The experimental results obtained disagree with the predictions of the classical models. A new approach of nucleation mechanism is established to clarify the nexus between the surface wettability and the nucleate boiling heat transfer. In this approach, we introduce the concept of macro- and micro-contact angles to explain the observed phenomenon.

Published
2009
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10. A new approach to understanding the effects of surface wettability on nucleate boiling.

Author

Hai Trieu Phan, Caney, Nadia, Marty, Philippe, Colasson, Stéphane, and Gavillet, Jerome

Subjects
*NUCLEATE boiling, *SURFACE chemistry, *HEAT transfer, *SURFACE coatings, *NUCLEATION
Abstract

Although boiling process has been a major subject of research for several decades, its physics still remain unclear and require further investigation. This study aims at highlighting the effects of surface wettability on pool boiling heat transfer. Nanocoating techniques were used to vary the water contact angle from 20 to 1100 by modifying nanoscale surface topography and chemistry. The experimental results obtained disagree with the predictions of the classical models. A new approach of nucleation mechanism is established to clarify the nexus between the surface wettability and the nucleate boiling heat transfer. In this approach, we introduce the concept of macro- and micro- contact angles to explain the observed phenomenon. [ABSTRACT FROM AUTHOR]

Published
2009
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