JET IMPINGEMENT-COOLED MODULE FOR AUTOMOTIVE POWER ELECTRONICS USING WATER-ETHYLENE GLYCOL

2017 ◽  
Author(s):  
Michael A. Henry ◽  
John F. Maddox ◽  
Sushil Bhavnani ◽  
Roy W. Knight ◽  
James Pool
Keyword(s):  
Ethylene Glycol ◽  
Power Electronics ◽  
Jet Impingement

Erosion-Corrosion Wear of Heat-Exchanger Materials by Water/Ethylene-Glycol/Alumina Nanofluids

2018 ◽  
Vol 6 (2) ◽  
pp. 1-22
Author(s):  
Gustavo J. Molina ◽  
Fnu Aktaruzzaman ◽  
Valentin Soloiu ◽  
Mosfequr Rahman
Keyword(s):  
Heat Exchanger ◽  
Ethylene Glycol ◽  
Water Solution ◽  
Jet Impingement ◽  
Distilled Water ◽  
Corrosion Wear ◽  
Anticorrosion Protection ◽  
Erosion Corrosion ◽  
Alumina Nanofluid ◽  
Water Base

Nanofluids are suspensions of nanoparticles in ordinary coolants, but their tribological effects on heat-exchanger materials are unknown. Previous research has explored wear from distilled-water-base nanofluids only, while most engine-coolants are alcohol solutions in water. This article presents testing of aluminum and copper by jet impingement of 50%-ethylene-glycol in water solution and of its 2%-alumina nanofluid. The effects are investigated of nanoparticle addition on the anticorrosion protection provided by ethylene glycol. The observed modifications showed that ethylene-glycol in water nanofluid led to wear patterns that were different than those obtained with the base-fluid; nanoalumina addition enhanced erosion and corrosion on aluminum and copper. Comparing the effects of ethylene glycol and its nanofluid solutions to those from same tests performed with distilled-water and its nanofluid suggests that nanopowders can substantially enhance wear by decreasing the anticorrosion action of ethylene glycol by a synergetic mechanism of erosion-corrosion

scholarly journals Jet-Impingement Effects of Alumina-Nanofluid on Aluminum and Copper

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Gustavo J. Molina ◽  
Fnu Aktaruzzaman ◽  
Whitney Stregles ◽  
Valentin Soloiu ◽  
Mosfequr Rahman
Keyword(s):  
Ethylene Glycol ◽  
Base Fluid ◽  
Cooling System ◽  
Jet Impingement ◽  
Surface Modifications ◽  
Optical Microscope ◽  
Cooling Fluid ◽  
Nanosize Powder ◽  
Alumina Nanofluid ◽  
Surface Changes

Nanofluids are nanosize-powder suspensions that are of interest for their enhanced thermal transport properties. They are studied as promising alternatives to ordinary cooling fluids, but the tribiological effects of nanofluids on cooling-system materials are largely unknown. The authors have developed methodology that uses jet impingement on typical cooling-system materials to test such effects. The work is presented of the authors’ research on the interactions of a typical nanofluid (2% volume of alumina nanopowders in a solution of ethylene glycol in water) which is impinged on aluminum and copper specimens for tests as long as 112 hours. The surface changes were assessed by roughness measurements and optical-microscope studies. Comparative roughness indicate that both the reference cooling fluid of ethylene glycol and water and its nanofluid with 2% alumina produce roughness changes in aluminum (even for the shortest 3-hour test), but no significant roughness differences were observed between them. No significant roughness changes were observed for copper. Microscopy observations, however, show different surface modifications in both aluminum and copper by both the nanofluid and its base fluid. The possible mechanisms of early erosion are discussed. These investigations demonstrate suitable methods for the testing of nanofluid effects on cooling system-materials.

Local Thermal Measurements of Impinging Liquid Jets With an Angled Confining Wall for Power Electronics Cooling

2015 ◽  
Author(s):  
John F. Maddox ◽  
Roy W. Knight ◽  
Sushil H. Bhavnani
Keyword(s):  
Heat Transfer ◽  
Reynolds Number ◽  
Nusselt Number ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Power Electronics ◽  
Electronics Cooling ◽  
Jet Impingement ◽  
Liquid Jets ◽  
Local Surface Temperature

The local surface temperature, heat flux, heat transfer coefficient, and Nusselt number were measured for an inline array of circular, normal jets of single-phase, liquid water impinging on a copper block with a common outlet for spent flow, and an experimental 2-D surface map was obtained by translating the jet array relative to the sensors. The effects of variation in jet height, jet pitch, confining wall angle, and average jet Reynolds number were investigated. A strong interaction between the effects of the geometric parameters was observed, and a 5° confining wall was seen to be an effective method of managing the spent flow for jet impingement cooling of power electronics. The maximum average heat transfer coefficient of 13,100W=m2K and average Nusselt number of 67.7 were measured at an average jet Reynolds number of 14,000.

Comparison of Different Single-Phase Liquid Jet Impingement Cooling Configurations in the Context of Thermal Management in Power Electronics

2005 ◽  
Author(s):  
Sreekant V. J. Narumanchi ◽  
Desikan Bharathan ◽  
Vahab Hassani
Keyword(s):  
Heat Transfer ◽  
Free Surface ◽  
Power Electronics ◽  
Single Phase ◽  
Numerical Study ◽  
Jet Impingement ◽  
Cooling Power ◽  
Practical Implementation ◽  
Chip Surface ◽  
The Past

Jet impingement has been an attractive cooling option in a number of industries over the past few decades. Over the past fifteen years, jet impingement has been explored as a cooling option in microelectronics. Recently, interest has also been expressed by the automotive industry in exploring jet impingement as an option for cooling power electronics components. The main purpose of this paper is to compare the different single-phase jet impingement configurations, which have been reported in the literature, primarily from a heat transfer viewpoint. The discussion is also from the viewpoint of the cooling of IGBTs (insulated-gate bipolar transistors), which are found in inverters in hybrid automobiles. In the literature, single and multiple submerged as well as free-surface jets have been investigated. A number of correlations for heat transfer from the simulated chip surface have been presented. These correlations, as well as the results from them will be discussed in detail. We will also present results for the average heat transfer coefficient on the chip surface as a function of both coolant mass flow rate as well as velocity. All the results presented are for water jets. A numerical study of some of the single-jet cooling configurations (free-surface as well as submerged) is also performed and the CFD results are compared to the results obtained from the empirical correlations. The pressure drop associated with these jet impingement systems is also examined briefly. From the standpoint of practical implementation, high velocity jets have the potential to erode the material on which they impinge. This paper will briefly discuss erosion rates associated with jets impinging on aluminum and copper.

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