Heat Transfer Coefficients between Fluid Jets and Normal Surfaces. Behavior of Laminar Impacted Jets

1959 ◽  
Vol 51 (8) ◽  
pp. 967-972 ◽  
Author(s):  
J. M. F. Vickers
Keyword(s):  
Heat Transfer ◽  
Transfer Coefficients ◽  
Heat Transfer Coefficients ◽  
Normal Surfaces ◽  
Fluid Jets

scholarly journals Convective Heat Transfer Coefficients of Automatic Transmission Fluid Jets With Implications for Electric Machine Thermal Management

2015 ◽  
Author(s):  
Kevin Bennion ◽  
Gilberto Moreno
Keyword(s):  
Heat Transfer ◽  
Thermal Management ◽  
Automatic Transmission ◽  
Electric Machines ◽  
Electric Machine ◽  
Transfer Coefficients ◽  
Heat Transfer Coefficients ◽  
Vehicle Propulsion ◽  
Fluid Jets ◽  
Transmission Fluid

Thermal management for electric machines (motors/generators) is important as the automotive industry continues to transition to more electrically dominant vehicle propulsion systems. Cooling of the electric machine(s) in some electric vehicle traction drive applications is accomplished by impinging automatic transmission fluid (ATF) jets onto the machine’s copper windings. In this study, we provide the results of experiments characterizing the thermal performance of ATF jets on surfaces representative of windings, using Ford’s Mercon LV ATF. Experiments were carried out at various ATF temperatures and jet velocities to quantify the influence of these parameters on heat transfer coefficients. Fluid temperatures were varied from 50°C to 90°C to encompass potential operating temperatures within an automotive transaxle environment. The jet nozzle velocities were varied from 0.5 to 10 m/s. The experimental ATF heat transfer coefficient results provided in this report are a useful resource for understanding factors that influence the performance of ATF-based cooling systems for electric machines.

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