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M Ibanez - One of the best experts on this subject based on the ideXlab platform.
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numerical study of a hybrid jet impingement micro channel Cooling Scheme
Applied Thermal Engineering, 2012Co-Authors: Jerome Barrau, Daniel Chemisana, M Ibanez, Mohammed Omri, J R Rosell, Lounes TadristAbstract: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.
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effect of a hybrid jet impingement micro channel Cooling device on the performance of densely packed pv cells under high concentration
Solar Energy, 2011Co-Authors: Jerome Barrau, J I Rosell, Daniel Chemisana, Lounes Tadrist, M IbanezAbstract: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.
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an experimental study of a new hybrid jet impingement micro channel Cooling Scheme
Applied Thermal Engineering, 2010Co-Authors: Jerome Barrau, Daniel Chemisana, Lounes Tadrist, J R Rosell, M IbanezAbstract: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.
Lounes Tadrist - One of the best experts on this subject based on the ideXlab platform.
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numerical study of a hybrid jet impingement micro channel Cooling Scheme
Applied Thermal Engineering, 2012Co-Authors: Jerome Barrau, Daniel Chemisana, M Ibanez, Mohammed Omri, J R Rosell, Lounes TadristAbstract: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.
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effect of a hybrid jet impingement micro channel Cooling device on the performance of densely packed pv cells under high concentration
Solar Energy, 2011Co-Authors: Jerome Barrau, J I Rosell, Daniel Chemisana, Lounes Tadrist, M IbanezAbstract: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.
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an experimental study of a new hybrid jet impingement micro channel Cooling Scheme
Applied Thermal Engineering, 2010Co-Authors: Jerome Barrau, Daniel Chemisana, Lounes Tadrist, J R Rosell, M IbanezAbstract: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.
Jerome Barrau - One of the best experts on this subject based on the ideXlab platform.
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numerical study of a hybrid jet impingement micro channel Cooling Scheme
Applied Thermal Engineering, 2012Co-Authors: Jerome Barrau, Daniel Chemisana, M Ibanez, Mohammed Omri, J R Rosell, Lounes TadristAbstract: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.
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effect of a hybrid jet impingement micro channel Cooling device on the performance of densely packed pv cells under high concentration
Solar Energy, 2011Co-Authors: Jerome Barrau, J I Rosell, Daniel Chemisana, Lounes Tadrist, M IbanezAbstract: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.
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an experimental study of a new hybrid jet impingement micro channel Cooling Scheme
Applied Thermal Engineering, 2010Co-Authors: Jerome Barrau, Daniel Chemisana, Lounes Tadrist, J R Rosell, M IbanezAbstract: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.
Issam Mudawar - One of the best experts on this subject based on the ideXlab platform.
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single phase hybrid micro channel micro jet impingement Cooling
International Journal of Heat and Mass Transfer, 2008Co-Authors: Myung Ki Sung, Issam MudawarAbstract:Abstract A new hybrid Cooling Scheme is proposed for high-flux thermal management of electronic and power devices. This Scheme combines the Cooling benefits of micro-channel flow and micro-jet impingement with those of indirect refrigeration Cooling. Experiments were performed to assess single-phase Cooling performance using HFE 7100 as working fluid. Excellent predictions were achieved using the standard k–e model. The proposed Cooling Scheme is shown to involve complex interactions of impinging jets with micro-channel flow. Increasing jet velocity allows jets to penetrate the micro-channel flow toward the heated surface, especially in shallow micro-channels, greatly decreasing wall temperature. Despite the relatively poor thermophysical properties of HFE 7100, the proposed Cooling Scheme facilitated the dissipation of 304.9 W/cm2 without phase change; further improvement is possible by increasing jet velocity and/or decreasing coolant temperature. In addition to the numerical predictions, a superpositioning technique is introduced that partitions the heat transfer surface into zones that are each dominated by a different heat transfer mechanism, and assigning a different heat transfer coefficient value to each zone. Using this technique, a new correlation is developed that fits the data with a mean absolute error of 6.04%.
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fluid flow and heat transfer characteristics of low temperature two phase micro channel heat sinks part 2 subcooled boiling pressure drop and heat transfer
International Journal of Heat and Mass Transfer, 2008Co-Authors: Issam MudawarAbstract:This second part of a two-part study explores the performance of a new Cooling Scheme in which the primary working fluid flowing through a micro-channel heat sink is indirectly cooled by a refrigeration Cooling system. The objective of this part of study is to explore the pressure drop and heat transfer characteristics of the heat sink. During single-phase Cooling, pressure drop decreased with increasing heat flux because of decreased liquid viscosity. However, pressure drop began increasing with increasing heat flux following bubble departure. These opposite trends produced a minimum in the variation of pressure drop with heat flux. Increasing liquid subCooling decreased two-phase pressure drop because of decreased void fraction caused by strong condensation at bubble interfaces as well as decreased likelihood of bubble coalescence. It is shown macro-channel subcooled boiling pressure drop and heat transfer correlations are unsuitable for micro-channel flows. However, two new modified correlations produced good predictions of the present heat transfer data.
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fluid flow and heat transfer characteristics of low temperature two phase micro channel heat sinks part 1 experimental methods and flow visualization results
International Journal of Heat and Mass Transfer, 2008Co-Authors: Jaeseon Lee, Issam MudawarAbstract:Abstract A new Cooling Scheme is proposed where the primary working fluid flowing through a micro-channel heat sink is pre-cooled to low temperature using an indirect refrigeration Cooling system. Cooling performance was explored using HFE 7100 as working fluid and four different micro-channel sizes. High-speed video imaging was employed to help explain the complex interrelated influences of hydraulic diameter, micro-channel width, mass velocity and subCooling on Cooling performance. Unlike most prior two-phase micro-channel heat sink studies, which involved annular film evaporation due high void fraction, the low coolant temperatures used in this study produced subcooled flow boiling conditions. Decreasing coolant temperature delayed the onset of boiling, reduced bubble size and coalescence effects, and enhanced CHF. Heat fluxes in excess of 700 W/cm 2 could be managed without burnout. Premature CHF occurred at low mass velocities and was caused by vapor flow reversal toward the inlet plenum. This form of CHF was eliminated by decreasing coolant temperature and/or increasing flow rate.
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correlation of critical heat flux in hybrid jet impingement micro channel Cooling Scheme
International Journal of Heat and Mass Transfer, 2006Co-Authors: Myung Ki Sung, Issam MudawarAbstract:Experiments were performed to investigate the two-phase Cooling characteristics of a new hybrid Cooling Scheme combining the Cooling attributes of slot jets and micro-channel flow. A test module was constructed in which dielectric PF-5052 liquid was introduced through five 0.48 mm wide and 12.7 mm long slot jets, each leading to a 1.59 mm wide and 1.02 mm deep channel. Increases in flow rate and subCooling yielded similar trends of delaying the inception of boiling and increasing critical heat flux (CHF). A previous channel flow correlation predicted CHF values far smaller than measured, while those for slot jets yielded closer predictions. This proves the Cooling performance of the hybrid configuration is dominated more by jet impingement than by micro-channel flow. By dividing the test surface into a portion that is dominated by jet impingement and another by micro-channel flow, and applying the appropriate CHF correlation for each portion, the CHF data for this hybrid Cooling configuration are predicted with a mean absolute error of 8.42%.
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experimental and numerical investigation of single phase heat transfer using a hybrid jet impingement micro channel Cooling Scheme
International Journal of Heat and Mass Transfer, 2006Co-Authors: Myung Ki Sung, Issam MudawarAbstract:Abstract Experimental and numerical methods were used to explore the Cooling performance of a new hybrid device consisting of a slot jet impinging into a micro-channel, thus capitalizing upon the merits of both Cooling configurations. The three-dimensional heat transfer characteristics of this device were analyzed using the standard k–e turbulent model. Numerical predictions for liquid PF-5052 show excellent agreement with experimental measurements. Vorticity effects are shown to greatly influence Cooling performance outside the impingement zone. Higher jet Reynolds numbers yielded stronger attachment to the heated surface and lower surface temperatures. The model was also used to optimize the Cooling performance for a water-cooled device. Lower surface temperatures were achieved by decreasing jet width and micro-channel height. These findings are used to recommend a simplified hybrid Cooling geometry in pursuit of both lower surface temperatures and smaller temperature gradients across the heated surface.
Daniel Chemisana - One of the best experts on this subject based on the ideXlab platform.
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numerical study of a hybrid jet impingement micro channel Cooling Scheme
Applied Thermal Engineering, 2012Co-Authors: Jerome Barrau, Daniel Chemisana, M Ibanez, Mohammed Omri, J R Rosell, Lounes TadristAbstract: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.
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effect of a hybrid jet impingement micro channel Cooling device on the performance of densely packed pv cells under high concentration
Solar Energy, 2011Co-Authors: Jerome Barrau, J I Rosell, Daniel Chemisana, Lounes Tadrist, M IbanezAbstract: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.
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an experimental study of a new hybrid jet impingement micro channel Cooling Scheme
Applied Thermal Engineering, 2010Co-Authors: Jerome Barrau, Daniel Chemisana, Lounes Tadrist, J R Rosell, M IbanezAbstract: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.