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Martine Baelmans - One of the best experts on this subject based on the ideXlab platform.

  • Demonstration of Package Level 3D-printed Direct Jet Impingement Cooling applied to High power, Large Die Applications
    2020 IEEE 70th Electronic Components and Technology Conference (ECTC), 2020
    Co-Authors: T.-w. Wei, Herman Oprins, Vladimir Cherman, Eric Beyne, Z. Yang, K. Rivera, G. Van Der Plas, B. J. Pawlak, L. England, Martine Baelmans
    Abstract:

    This work presents, for the first time, a package- level, bare die liquid Jet Impingement 3D polymer microfluidics heatsink fabricated using 3D printing, or additive manufacturing for large die size and high-power applications. The heatsink achieves a chip temperature increase of 17.5°C at a chip power of 285 W for a coolant flow rate of 3.25 LPM, demonstrating that 3D printing enables the design for low-cost, high efficiency direct on-chip microfluidic heatsink with complex internal 3D manifold liquid delivery channels. The measurement results show that the Jet Impingement cooling performance can be successfully described using a unit cell approach, allowing an easy scaling of the thermal performance for arbitrary die size applications. Long term thermal tests of 1000h show a constant thermal performance and no degradation of the cooler material.

  • experimental characterization and model validation of liquid Jet Impingement cooling using a high spatial resolution and programmable thermal test chip
    Applied Thermal Engineering, 2019
    Co-Authors: Tiwei Wei, Herman Oprins, Vladimir Cherman, Eric Beyne, G. Van Der Plas, I De Wolf, Martine Baelmans
    Abstract:

    Abstract High efficiency direct liquid Jet Impingement cooling with locally distributed outlets is very promising in high power electronic devices. In order to elucidate the flow-thermal interaction for micro-scale Jet Impingement cooling, sensitive temperature measurements with high spatial and temporal resolution are required. In this work, a programmable thermal test chip with 832 heater cells with 75% heater uniformity and 32 × 32 array of temperature sensors is introduced. The detailed measured temperature maps for different power dissipation patterns allow the in-depth study of the thermal performance of liquid Jet Impingement coolers and the detailed experimental validation of complex CFD models. The modeling and measurement study is applied to two Jet Impingement cooling implementations: (1) a single Jet cooler with a 2 mm diameter nozzle, and (2) a multi-Jet cooler with a 4 × 4 array of 500 µm inlet nozzles and distributed outlet nozzles. For both cooler configurations, the temperature measurements and CFD modeling results are investigated and compared for uniform and hot spot power dissipation patterns.

  • High-Efficiency Polymer-Based Direct Multi-Jet Impingement Cooling Solution for High-Power Devices
    IEEE Transactions on Power Electronics, 2019
    Co-Authors: Tiwei Wei, Ingrid De Wolf, Herman Oprins, Vladimir Cherman, Eric Beyne, Jun Qian, Martine Baelmans
    Abstract:

    A high-efficiency three-dimensionally (3-D) shaped polymer multi-Jet Impingement cooler based on cost-efficient fabrication techniques is introduced for the cooling of high-power applications. State-of-the-art highly efficient multi-Jet cooling solutions rely on expensive Si or ceramic fabrication techniques, while low-cost cooling solutions have been proposed for less performant single-Jet Impingement. In this paper, we present the concept, modeling, design, fabrication, experimental characterization, and benchmarking with literature data of a multi-Jet Impingement based liquid cooling solution, fabricated using low-cost polymer fabrication techniques, targeted to directly cool the backside of high-power devices. For the modeling study, unit cell model and full system level models are used to study the nozzle array scaling trends and thermal and fluidic Jet-to-Jet interactions. Furthermore, design guidelines for high-power electronics cooling are provided, including geometry selections, material selection, and fabrication techniques. Based on the design guidelines and cooling concept, this paper demonstrates a 3-D-shaped polymer Impingement cooler with a 4 × 4 nozzle array, showing a very good thermal performance with low required pumping power. The multi-Jet cooler can achieve heat transfer coefficients up to 6.25 × 104 W/m2·K with a pump power as low as 0.3 W. The benchmarking study confirms furthermore that multi-Jet cooling is more efficient than single-Jet cooling and that direct cooling on the backside of the semiconductor device is more efficient than cooling the substrate or base plate.

  • 3D Printed Liquid Jet Impingement Cooler: Demonstration, Opportunities and Challenges
    2018 IEEE 68th Electronic Components and Technology Conference (ECTC), 2018
    Co-Authors: Tiwei Wei, Ingrid De Wolf, Herman Oprins, Vladimir Cherman, Eric Beyne, Martine Baelmans
    Abstract:

    Liquid Jet Impingement cooling is a very efficient cooling technology for high performance devices. Previous studies demonstrated that polymers can be used as a cost effective alternative for Si for the fabrication of Impingement coolers. The recent developments in additive manufacturing or 3D printing technology enable the potential to fabricate low cost polymer coolers with complex internal channels. In this paper, the use of 3D printing is discussed for the fabrication of a chip level polymer Impingement cooler. The paper presents the cooler design, the manufacturability aspects and the characterization of several 3D printed coolers with different nozzles arrays. The challenges and opportunities for the use of 3D printing for this applications are discussed. A methodology to provide design guidelines for 3D printed liquid Impingement Jet coolers is elaborated.

  • high efficiency direct liquid Jet Impingement cooling of high power devices using a 3d shaped polymer cooler
    International Electron Devices Meeting, 2017
    Co-Authors: T Tiwei, Herman Oprins, Vladimir Cherman, Eric Beyne, G. Van Der Plas, I De Wolf, Martine Baelmans
    Abstract:

    A novel 3D-shaped polymer multi-Jet Impingement cooler based on low cost fabrication techniques is introduced for high performance applications. This paper presents the modeling study, design, fabrication, experimental characterization and benchmarking of this cooling concept, showing a very good thermal performance with low required pumping power.

Jerome Barrau - One of the best experts on this subject based on the ideXlab platform.

  • nozzle to plate optimization of the Jet Impingement inlet of a tailored width microchannel heat exchanger
    Experimental Thermal and Fluid Science, 2015
    Co-Authors: Jerome Barrau, Sara Riera, Etienne Leveille, Luc G Frechette, J I Rosell
    Abstract:

    Abstract This work presents an experimental study on the effect of the nozzle geometry on the performance of a hybrid Jet-Impingement/microchannels cooling system. The proposed heat sink is designed so as to maintain the temperature of the cooled surface uniform, even with the coolant flow temperature increasing along the flow path. Previous results showed quite uniform temperature distributions with the exception of the zone located just below the Jet Impingement, where the temperature is higher. In the present work, several nozzle to plate spacings (z/b) are experimentally studied. The impact of nozzle to plate spacing on the stagnation point Nusselt number and the overall temperature distribution varies as a function of the coolant flow rate. A strong coupling between the slot Jet geometry, the heat exchange in the varying width microchannel sections and the flow regime is demonstrated. The global thermal resistance, the temperature uniformity and the pressure drops show distinct behavior as a function of the nozzle to plate spacing, implying that the design procedure may weight up these parameters according to the cooling needs.

  • numerical study of a hybrid Jet Impingement micro channel cooling scheme
    Applied Thermal Engineering, 2012
    Co-Authors: Jerome Barrau, Daniel Chemisana, M Ibanez, Mohammed Omri, J R Rosell, Lounes Tadrist
    Abstract:

    Abstract A new hybrid Jet Impingement/micro-channel cooling scheme is studied numerically for use in high-heat-flux thermal management of electronic and power devices. The device is developed with the objective of improving the temperature uniformity of the cooled object. A numerical model based on the k – ω SST turbulent model is developed and validated experimentally. This model is used to carry out a parametrical characterization of the heat sink. The study shows that variations in key parameters of Jet Impingement and micro-channel technologies allow for the cooling scheme to obtain a wide range of temperature profiles for the cooled object.

  • effect of a hybrid Jet Impingement micro channel cooling device on the performance of densely packed pv cells under high concentration
    Solar Energy, 2011
    Co-Authors: Jerome Barrau, J I Rosell, Daniel Chemisana, Lounes Tadrist, M Ibanez
    Abstract:

    Abstract This paper studies in deep the performance of a new hybrid Jet Impingement/micro-channel cooling scheme for densely packed PV cells under high concentration. The device combines a slot Jet Impingement with a non-uniform distribution of micro-channels. The Net PV output of the concentrator system, defined as the PV output less the pumping power, and its temperature uniformity are analyzed. The hybrid cooling scheme offers a minimum thermal resistance coefficient of 2.18 × 10−5 K m2/W with a pressure drop lower than in micro-channel devices. This characteristic involves that the Net PV Output of the PV receiver is higher when cooled by the hybrid design than when cooled by the micro-channel one. The chance to modify, at the design stage, the internal geometry of the hybrid cooling scheme allows improving the temperature uniformity of the PV receiver through the adequate distribution of the local heat removal capacity.

  • an experimental study of a new hybrid Jet Impingement micro channel cooling scheme
    Applied Thermal Engineering, 2010
    Co-Authors: Jerome Barrau, Daniel Chemisana, Lounes Tadrist, J R Rosell, M Ibanez
    Abstract:

    A new hybrid cooling scheme is proposed for high heat flux management and power devices. This scheme combines the benefits of micro-channel and Jet Impingement cooling technologies, with the additional objective of improving the temperature uniformity of the cooled object. The geometry is tested experimentally to characterize its performances and to assess its capacity to provide this characteristic. The temperature distribution of the heat sink has been measured through a matrix of thermocouples. The hybrid cooling scheme is shown to have the capacity to optimize the temperature uniformity of the cooled object, since the experimental design provides a global decrease of the temperature of the heat sink in the direction of the fluid flow.

M Ibanez - One of the best experts on this subject based on the ideXlab platform.

  • numerical study of a hybrid Jet Impingement micro channel cooling scheme
    Applied Thermal Engineering, 2012
    Co-Authors: Jerome Barrau, Daniel Chemisana, M Ibanez, Mohammed Omri, J R Rosell, Lounes Tadrist
    Abstract:

    Abstract A new hybrid Jet Impingement/micro-channel cooling scheme is studied numerically for use in high-heat-flux thermal management of electronic and power devices. The device is developed with the objective of improving the temperature uniformity of the cooled object. A numerical model based on the k – ω SST turbulent model is developed and validated experimentally. This model is used to carry out a parametrical characterization of the heat sink. The study shows that variations in key parameters of Jet Impingement and micro-channel technologies allow for the cooling scheme to obtain a wide range of temperature profiles for the cooled object.

  • effect of a hybrid Jet Impingement micro channel cooling device on the performance of densely packed pv cells under high concentration
    Solar Energy, 2011
    Co-Authors: Jerome Barrau, J I Rosell, Daniel Chemisana, Lounes Tadrist, M Ibanez
    Abstract:

    Abstract This paper studies in deep the performance of a new hybrid Jet Impingement/micro-channel cooling scheme for densely packed PV cells under high concentration. The device combines a slot Jet Impingement with a non-uniform distribution of micro-channels. The Net PV output of the concentrator system, defined as the PV output less the pumping power, and its temperature uniformity are analyzed. The hybrid cooling scheme offers a minimum thermal resistance coefficient of 2.18 × 10−5 K m2/W with a pressure drop lower than in micro-channel devices. This characteristic involves that the Net PV Output of the PV receiver is higher when cooled by the hybrid design than when cooled by the micro-channel one. The chance to modify, at the design stage, the internal geometry of the hybrid cooling scheme allows improving the temperature uniformity of the PV receiver through the adequate distribution of the local heat removal capacity.

  • an experimental study of a new hybrid Jet Impingement micro channel cooling scheme
    Applied Thermal Engineering, 2010
    Co-Authors: Jerome Barrau, Daniel Chemisana, Lounes Tadrist, J R Rosell, M Ibanez
    Abstract:

    A new hybrid cooling scheme is proposed for high heat flux management and power devices. This scheme combines the benefits of micro-channel and Jet Impingement cooling technologies, with the additional objective of improving the temperature uniformity of the cooled object. The geometry is tested experimentally to characterize its performances and to assess its capacity to provide this characteristic. The temperature distribution of the heat sink has been measured through a matrix of thermocouples. The hybrid cooling scheme is shown to have the capacity to optimize the temperature uniformity of the cooled object, since the experimental design provides a global decrease of the temperature of the heat sink in the direction of the fluid flow.

Dongsheng Wen - One of the best experts on this subject based on the ideXlab platform.

  • Jet Impingement heat transfer on a concave surface in a wing leading edge experimental study and correlation development
    Experimental Thermal and Fluid Science, 2016
    Co-Authors: Long Peng, Guiping Lin, Lizhan Bai, Dongsheng Wen
    Abstract:

    Extensive experimental studies of the heat transfer characteristics of Jet Impingement on a variable-curvature concave surface in a wing leading edge were conducted for aircraft anti-icing applications. The experiments were performed using a piccolo tube with three rows of aligned Jet holes over a wide range of parameters: the Jet Reynolds number (Rej) from 50,000 to 90,000, the relative tube-to-surface distance (H/d) from 1.74 to 20.0, the Jet Impingement angle (α) from 66° to 90°, and the relative chordwise arc length in the Jet Impingement zone (r/d) from 13.2 to 34.8. Experimental results indicated that the heat transfer performance at the stagnation point was enhanced with increasing Rej and α, and an optimal H/d existed to achieve the best heat transfer performance at the stagnation point corresponding to specific operating parameters. It was found that the attenuation coefficient curve of Jet Impingement heat transfer in the chordwise direction exhibited an approximate bell shape with the peak located at the stagnation point, affected only by r/d in the peak zone. In the non-peak zone, however it was affected significantly by a variety of factors including Rej, H/d and r/d. Experimental data-based correlations of the Nusselt number at the stagnation point and the distribution of the attenuation coefficient in the chordwise direction were developed and validated, which contributes significantly to the future design of a wing anti-icing system with three rows of aligned Jet holes.

  • experimental study of Jet Impingement heat transfer on a variable curvature concave surface in a wing leading edge
    International Journal of Heat and Mass Transfer, 2015
    Co-Authors: Long Peng, Guiping Lin, Lizhan Bai, Dongsheng Wen
    Abstract:

    In this paper, extensive experimental investigation of the heat transfer characteristics of Jet Impingement on a variable-curvature concave surface in a wing leading edge was conducted for aircraft anti-icing applications. The experiments were carried out over a wide range of parameters: the Jet Reynolds number, Rej, from 51,021 to 85,340, the relative tube-to-surface distance, H/d, from 1.736 to 19.76, and the circumferential angle of Jet holes on the piccolo tube, θ, from −60° to 60°. In addition, Jet Impingements with single one, two and three rows of aligned Jet holes were all investigated. Experimental results revealed the effects of various parameters on the performance and characteristics of Jet Impingement heat transfer in the specific structure adopted here, and our insufficient understanding on the corresponding physical mechanism was presented. It was found that the Jet Impingement heat transfer performance was enhanced with the increase of Jet Reynolds number. For single one row of Jet holes, an optimal H/d of 4.5 was determined under Rej = 51,021 and d = 2 mm, for which the Jet Impingement achieved the best heat transfer performance. For two and three rows of aligned Jet holes, the Nux curves in the chordwise direction exhibited much different shapes due to different intensity of the interference between adjacent air Jets. This work contributes to a better understanding of the Jet Impingement heat transfer on a concave surface in a wing leading edge, which can lead to optimal design of the aircraft anti-icing system.

Lizhan Bai - One of the best experts on this subject based on the ideXlab platform.

  • Jet Impingement heat transfer on a concave surface in a wing leading edge experimental study and correlation development
    Experimental Thermal and Fluid Science, 2016
    Co-Authors: Long Peng, Guiping Lin, Lizhan Bai, Dongsheng Wen
    Abstract:

    Extensive experimental studies of the heat transfer characteristics of Jet Impingement on a variable-curvature concave surface in a wing leading edge were conducted for aircraft anti-icing applications. The experiments were performed using a piccolo tube with three rows of aligned Jet holes over a wide range of parameters: the Jet Reynolds number (Rej) from 50,000 to 90,000, the relative tube-to-surface distance (H/d) from 1.74 to 20.0, the Jet Impingement angle (α) from 66° to 90°, and the relative chordwise arc length in the Jet Impingement zone (r/d) from 13.2 to 34.8. Experimental results indicated that the heat transfer performance at the stagnation point was enhanced with increasing Rej and α, and an optimal H/d existed to achieve the best heat transfer performance at the stagnation point corresponding to specific operating parameters. It was found that the attenuation coefficient curve of Jet Impingement heat transfer in the chordwise direction exhibited an approximate bell shape with the peak located at the stagnation point, affected only by r/d in the peak zone. In the non-peak zone, however it was affected significantly by a variety of factors including Rej, H/d and r/d. Experimental data-based correlations of the Nusselt number at the stagnation point and the distribution of the attenuation coefficient in the chordwise direction were developed and validated, which contributes significantly to the future design of a wing anti-icing system with three rows of aligned Jet holes.

  • experimental study of Jet Impingement heat transfer on a variable curvature concave surface in a wing leading edge
    International Journal of Heat and Mass Transfer, 2015
    Co-Authors: Long Peng, Guiping Lin, Lizhan Bai, Dongsheng Wen
    Abstract:

    In this paper, extensive experimental investigation of the heat transfer characteristics of Jet Impingement on a variable-curvature concave surface in a wing leading edge was conducted for aircraft anti-icing applications. The experiments were carried out over a wide range of parameters: the Jet Reynolds number, Rej, from 51,021 to 85,340, the relative tube-to-surface distance, H/d, from 1.736 to 19.76, and the circumferential angle of Jet holes on the piccolo tube, θ, from −60° to 60°. In addition, Jet Impingements with single one, two and three rows of aligned Jet holes were all investigated. Experimental results revealed the effects of various parameters on the performance and characteristics of Jet Impingement heat transfer in the specific structure adopted here, and our insufficient understanding on the corresponding physical mechanism was presented. It was found that the Jet Impingement heat transfer performance was enhanced with the increase of Jet Reynolds number. For single one row of Jet holes, an optimal H/d of 4.5 was determined under Rej = 51,021 and d = 2 mm, for which the Jet Impingement achieved the best heat transfer performance. For two and three rows of aligned Jet holes, the Nux curves in the chordwise direction exhibited much different shapes due to different intensity of the interference between adjacent air Jets. This work contributes to a better understanding of the Jet Impingement heat transfer on a concave surface in a wing leading edge, which can lead to optimal design of the aircraft anti-icing system.