The Experts below are selected from a list of 1328088 Experts worldwide ranked by ideXlab platform

Hassan Peerhossaini - One of the best experts on this subject based on the ideXlab platform.

  • Underhood thermal management: Temperature and heat flux measurements and Physical Analysis
    Applied Thermal Engineering, 2010
    Co-Authors: Mahmoud Khaled, Fabien Harambat, Hassan Peerhossaini
    Abstract:

    International audienceAerodynamic cooling drag, caused by car underhood cooling, can be reduced by better underhood aerothermal management. This study addresses the aerothermal phenomena encountered in the vehicle underhood compartment by Physical Analysis of the heat transfer modes in complex internal flows. We report here underhood heat flux and temperature measurements on a vehicle in wind tunnel S4 of Saint-Cyr-France using a new experimental method. The underhood is instrumented by 40 surface and air thermocouples and 20 fluxmeters. Measurements are carried out for three thermal functioning points: the engine in operation and the front wheels positioned on the test facility with power-absorption-controlled rollers. The ultimate aim is to reengineer the underhood architecture so as to reduce the cooling air flow rate in the underhood component and hence the aerothermal cooling drag

  • Underhood thermal management: temperature and heat flux measurements and Physical Analysis
    Applied Thermal Engineering, 2009
    Co-Authors: Mahmoud Khaled, Fabien Harambat, Hassan Peerhossaini
    Abstract:

    Aerodynamic cooling drag, caused by car underhood cooling, can be reduced by better underhood aerothermal management. This study addresses the aerothermal phenomena encountered in the vehicle underhood compartment by Physical Analysis of the heat transfer modes in complex internal flows. We report here underhood heat flux and temperature measurements on a vehicle in wind tunnel S4 of Saint-Cyr-France using a new experimental method. The underhood is instrumented by 40 surface and air thermocouples and 20 fluxmeters. Measurements are carried out for three thermal functioning points: the engine in operation and the front wheels positioned on the test facility with power-absorption-controlled rollers. The ultimate aim is to reengineer the underhood architecture so as to reduce the cooling air flow rate in the underhood component and hence the aerothermal cooling drag.

Mahmoud Khaled - One of the best experts on this subject based on the ideXlab platform.

  • Underhood thermal management: Temperature and heat flux measurements and Physical Analysis
    Applied Thermal Engineering, 2010
    Co-Authors: Mahmoud Khaled, Fabien Harambat, Hassan Peerhossaini
    Abstract:

    International audienceAerodynamic cooling drag, caused by car underhood cooling, can be reduced by better underhood aerothermal management. This study addresses the aerothermal phenomena encountered in the vehicle underhood compartment by Physical Analysis of the heat transfer modes in complex internal flows. We report here underhood heat flux and temperature measurements on a vehicle in wind tunnel S4 of Saint-Cyr-France using a new experimental method. The underhood is instrumented by 40 surface and air thermocouples and 20 fluxmeters. Measurements are carried out for three thermal functioning points: the engine in operation and the front wheels positioned on the test facility with power-absorption-controlled rollers. The ultimate aim is to reengineer the underhood architecture so as to reduce the cooling air flow rate in the underhood component and hence the aerothermal cooling drag

  • Underhood thermal management: temperature and heat flux measurements and Physical Analysis
    Applied Thermal Engineering, 2009
    Co-Authors: Mahmoud Khaled, Fabien Harambat, Hassan Peerhossaini
    Abstract:

    Aerodynamic cooling drag, caused by car underhood cooling, can be reduced by better underhood aerothermal management. This study addresses the aerothermal phenomena encountered in the vehicle underhood compartment by Physical Analysis of the heat transfer modes in complex internal flows. We report here underhood heat flux and temperature measurements on a vehicle in wind tunnel S4 of Saint-Cyr-France using a new experimental method. The underhood is instrumented by 40 surface and air thermocouples and 20 fluxmeters. Measurements are carried out for three thermal functioning points: the engine in operation and the front wheels positioned on the test facility with power-absorption-controlled rollers. The ultimate aim is to reengineer the underhood architecture so as to reduce the cooling air flow rate in the underhood component and hence the aerothermal cooling drag.

Fabien Harambat - One of the best experts on this subject based on the ideXlab platform.

  • Underhood thermal management: Temperature and heat flux measurements and Physical Analysis
    Applied Thermal Engineering, 2010
    Co-Authors: Mahmoud Khaled, Fabien Harambat, Hassan Peerhossaini
    Abstract:

    International audienceAerodynamic cooling drag, caused by car underhood cooling, can be reduced by better underhood aerothermal management. This study addresses the aerothermal phenomena encountered in the vehicle underhood compartment by Physical Analysis of the heat transfer modes in complex internal flows. We report here underhood heat flux and temperature measurements on a vehicle in wind tunnel S4 of Saint-Cyr-France using a new experimental method. The underhood is instrumented by 40 surface and air thermocouples and 20 fluxmeters. Measurements are carried out for three thermal functioning points: the engine in operation and the front wheels positioned on the test facility with power-absorption-controlled rollers. The ultimate aim is to reengineer the underhood architecture so as to reduce the cooling air flow rate in the underhood component and hence the aerothermal cooling drag

  • Underhood thermal management: temperature and heat flux measurements and Physical Analysis
    Applied Thermal Engineering, 2009
    Co-Authors: Mahmoud Khaled, Fabien Harambat, Hassan Peerhossaini
    Abstract:

    Aerodynamic cooling drag, caused by car underhood cooling, can be reduced by better underhood aerothermal management. This study addresses the aerothermal phenomena encountered in the vehicle underhood compartment by Physical Analysis of the heat transfer modes in complex internal flows. We report here underhood heat flux and temperature measurements on a vehicle in wind tunnel S4 of Saint-Cyr-France using a new experimental method. The underhood is instrumented by 40 surface and air thermocouples and 20 fluxmeters. Measurements are carried out for three thermal functioning points: the engine in operation and the front wheels positioned on the test facility with power-absorption-controlled rollers. The ultimate aim is to reengineer the underhood architecture so as to reduce the cooling air flow rate in the underhood component and hence the aerothermal cooling drag.

Cédric Duperrier - One of the best experts on this subject based on the ideXlab platform.

  • Electrical and Physical Analysis of Thermal Degradations of AlGaN/GaN HEMT Under Radar-Type Operating Life
    IEEE Transactions on Microwave Theory and Techniques, 2016
    Co-Authors: Farid Temcamani, Jean-baptiste Fonder, Olivier Latry, Cédric Duperrier
    Abstract:

    Failure mechanisms in AlGaN/GaN HEMT RF power amplifiers implemented on silicon substrate and envisaging radar operating conditions are investigated in this paper. Several power amplifier prototypes have been designed, fabricated, characterized, and tested. Ageing tests were performed in conditions as close as possible to real applications. Ageing under increased drain voltage allowed studying both thermal and electrical aspects. Characterization performed before and after ageing tests proved that ageing process is mainly due to thermal stress for the irreversible part and to trapping effects for the reversible one, respectively. This was confirmed by additional Physical Analysis, the results revealing strong changes of the Schottky contact. Photon emission microscopy associated with X radiography gives spatial correlation between gate degradation and evolution of the brazing interface between the transistor chip and its packaging. It also illustrates the appearance of overheating points and acceleration of the Schottky contact degradation.

  • Electrical and Physical Analysis of Thermal Degradations of AlGaN/GaN HEMT Under Radar-Type Operating Life
    IEEE Transactions on Microwave Theory and Techniques, 2016
    Co-Authors: Farid Temcamani, Jean-baptiste Fonder, Olivier Latry, Cédric Duperrier
    Abstract:

    International audienceFailure mechanisms in AlGaN/GaN HEMT RF power amplifiers implemented on silicon substrate and envisaging radar operating conditions are investigated in this paper. Several power amplifier prototypes have been designed, fabricated, characterized, and tested. Ageing tests were performed in conditions as close as possible to real applications. Ageing under increased drain voltage allowed studying both thermal and electrical aspects. Characterization performed before and after ageing tests proved that ageing process is mainly due to thermal stress for the irreversible part and to trapping effects for the reversible one, respectively. This was confirmed by additional Physical Analysis, the results revealing strong changes of the Schottky contact. Photon emission microscopy associated with X radiography gives spatial correlation between gate degradation and evolution of the brazing interface between the transistor chip and its packaging. It also illustrates the appearance of overheating points and acceleration of the Schottky contact degradation

Farid Temcamani - One of the best experts on this subject based on the ideXlab platform.

  • Electrical and Physical Analysis of Thermal Degradations of AlGaN/GaN HEMT Under Radar-Type Operating Life
    IEEE Transactions on Microwave Theory and Techniques, 2016
    Co-Authors: Farid Temcamani, Jean-baptiste Fonder, Olivier Latry, Cédric Duperrier
    Abstract:

    Failure mechanisms in AlGaN/GaN HEMT RF power amplifiers implemented on silicon substrate and envisaging radar operating conditions are investigated in this paper. Several power amplifier prototypes have been designed, fabricated, characterized, and tested. Ageing tests were performed in conditions as close as possible to real applications. Ageing under increased drain voltage allowed studying both thermal and electrical aspects. Characterization performed before and after ageing tests proved that ageing process is mainly due to thermal stress for the irreversible part and to trapping effects for the reversible one, respectively. This was confirmed by additional Physical Analysis, the results revealing strong changes of the Schottky contact. Photon emission microscopy associated with X radiography gives spatial correlation between gate degradation and evolution of the brazing interface between the transistor chip and its packaging. It also illustrates the appearance of overheating points and acceleration of the Schottky contact degradation.

  • Electrical and Physical Analysis of Thermal Degradations of AlGaN/GaN HEMT Under Radar-Type Operating Life
    IEEE Transactions on Microwave Theory and Techniques, 2016
    Co-Authors: Farid Temcamani, Jean-baptiste Fonder, Olivier Latry, Cédric Duperrier
    Abstract:

    International audienceFailure mechanisms in AlGaN/GaN HEMT RF power amplifiers implemented on silicon substrate and envisaging radar operating conditions are investigated in this paper. Several power amplifier prototypes have been designed, fabricated, characterized, and tested. Ageing tests were performed in conditions as close as possible to real applications. Ageing under increased drain voltage allowed studying both thermal and electrical aspects. Characterization performed before and after ageing tests proved that ageing process is mainly due to thermal stress for the irreversible part and to trapping effects for the reversible one, respectively. This was confirmed by additional Physical Analysis, the results revealing strong changes of the Schottky contact. Photon emission microscopy associated with X radiography gives spatial correlation between gate degradation and evolution of the brazing interface between the transistor chip and its packaging. It also illustrates the appearance of overheating points and acceleration of the Schottky contact degradation