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Jérôme Gavillet - One of the best experts on this subject based on the ideXlab platform.

  • Flow boiling of water in a minichannel: The effects of surface wettability on two-Phase Pressure Drop
    Applied Thermal Engineering, 2011
    Co-Authors: Hai Trieu Phan, Nadia Caney, Philippe Marty, Stéphane Colasson, Jérôme Gavillet
    Abstract:

    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/m s and 120 kg/m s, respectively. The base heat flux varied from 30 to 80 kW/m. 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.

  • Flow boiling of water in a microchannel: The effects of surface wettability on two-Phase Pressure Drop
    Applied Thermal Engineering, 2011
    Co-Authors: Hai Trieu Phan, Nadia Caney, Philippe Marty, Stéphane Colasson, Jérôme Gavillet
    Abstract:

    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.

  • Flow boiling of water in a minichannel: The effects of surface wettability on two-Phase Pressure Drop
    Applied Thermal Engineering, 2011
    Co-Authors: Hai Trieu Phan, Nadia Caney, Philippe Marty, Stéphane Colasson, Jérôme Gavillet
    Abstract:

    International audienceExperiments 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

Hai Trieu Phan - One of the best experts on this subject based on the ideXlab platform.

  • Flow boiling of water in a minichannel: The effects of surface wettability on two-Phase Pressure Drop
    Applied Thermal Engineering, 2011
    Co-Authors: Hai Trieu Phan, Nadia Caney, Philippe Marty, Stéphane Colasson, Jérôme Gavillet
    Abstract:

    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/m s and 120 kg/m s, respectively. The base heat flux varied from 30 to 80 kW/m. 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.

  • Flow boiling of water in a microchannel: The effects of surface wettability on two-Phase Pressure Drop
    Applied Thermal Engineering, 2011
    Co-Authors: Hai Trieu Phan, Nadia Caney, Philippe Marty, Stéphane Colasson, Jérôme Gavillet
    Abstract:

    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.

Gabriel Wild - One of the best experts on this subject based on the ideXlab platform.

  • Influence of gas density on the hydrodynamics of cocurrent gas-liquid upflow fixed bed reactors
    Industrial & Engineering Chemistry Research, 1994
    Co-Authors: Faïçal Larachi, Gabriel Wild, André Laurent, Noël Midoux
    Abstract:

    The effect of Pressure on the frictional two-Phase Pressure Drop and the gas holdup in a flooded fixed bed reactor with cocurrent upflow of gas and liquid is presented. It has been found that Pressure and gas molecular weight influence the Pressure Drop only via gas density. An increase of gas density results in an increase of two-Phase Pressure Drop and gas holdup at given fluid superficial velocities. Two extrapolation tools for the estimation of Pressure Drops in pressurized flooded beds exclusively from experiments conducted in nearly atmospheric conditions are proposed. A new two-Phase Pressure Drop correlation based upon more than 1800 measurements (including the authors' data and that from the literature) carried out within broad ranges of gas densities, liquid properties, particle sizes, and column diameters is developed

  • Experimental study of a trickle-bed reactor operating at high Pressure: two-Phase Pressure Drop and liquid saturation
    Chemical Engineering Science, 1991
    Co-Authors: Faïçal Larachi, Noël Midoux, A. Laurent, Gabriel Wild
    Abstract:

    The effect of Pressure on the hydrodynamics of trickle-bed reactors is investigated. The two-Phase Pressure Drop and the liquid hold-up (liquid RTD determination) were measured for Pressures up to 8.1 MPa. The influence of Pressure, gas and liquid flow rates, viscosity, the coalescence behaviour of the liquid, and the particle size was examined. The experimental results were compared to correlations from the literature and two new correlations for the Pressure Drop and the liquid hold-up for non-foaming liquids are proposed; they are based on 1500 experimental results. Consideration of systems exhibiting non-foaming behaviour shows that the two-Phase Pressure Drop is correctly described by the introduction of the modified Lockhart and Martinelli parameter. The liquid saturation data analysis shows that this hydrodynamic parameter is Pressure-independent for very low gas superficial velocities allowing for an acceptable estimation at atmospheric Pressure.

Stéphane Colasson - One of the best experts on this subject based on the ideXlab platform.

  • Flow boiling of water in a minichannel: The effects of surface wettability on two-Phase Pressure Drop
    Applied Thermal Engineering, 2011
    Co-Authors: Hai Trieu Phan, Nadia Caney, Philippe Marty, Stéphane Colasson, Jérôme Gavillet
    Abstract:

    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/m s and 120 kg/m s, respectively. The base heat flux varied from 30 to 80 kW/m. 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.

  • Flow boiling of water in a microchannel: The effects of surface wettability on two-Phase Pressure Drop
    Applied Thermal Engineering, 2011
    Co-Authors: Hai Trieu Phan, Nadia Caney, Philippe Marty, Stéphane Colasson, Jérôme Gavillet
    Abstract:

    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.

  • Flow boiling of water in a minichannel: The effects of surface wettability on two-Phase Pressure Drop
    Applied Thermal Engineering, 2011
    Co-Authors: Hai Trieu Phan, Nadia Caney, Philippe Marty, Stéphane Colasson, Jérôme Gavillet
    Abstract:

    International audienceExperiments 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

Nadia Caney - One of the best experts on this subject based on the ideXlab platform.

  • Flow boiling of water in a minichannel: The effects of surface wettability on two-Phase Pressure Drop
    Applied Thermal Engineering, 2011
    Co-Authors: Hai Trieu Phan, Nadia Caney, Philippe Marty, Stéphane Colasson, Jérôme Gavillet
    Abstract:

    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/m s and 120 kg/m s, respectively. The base heat flux varied from 30 to 80 kW/m. 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.

  • Flow boiling of water in a microchannel: The effects of surface wettability on two-Phase Pressure Drop
    Applied Thermal Engineering, 2011
    Co-Authors: Hai Trieu Phan, Nadia Caney, Philippe Marty, Stéphane Colasson, Jérôme Gavillet
    Abstract:

    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.

  • Flow boiling of water in a minichannel: The effects of surface wettability on two-Phase Pressure Drop
    Applied Thermal Engineering, 2011
    Co-Authors: Hai Trieu Phan, Nadia Caney, Philippe Marty, Stéphane Colasson, Jérôme Gavillet
    Abstract:

    International audienceExperiments 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