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Large density differences between liquid and vapor create buoyancy effects in the presence of a gravitational field. Such effects can play an important role in two-phase fluid flow and heat transfer, especially critical heat flux (CHF). CHF poses significant risk to electronic devices, and the ability to predict its magnitude is crucial to both the safety and reliability of these devices. Variations...
As radiologists demand increased power, speed and duty cycle from their magnetic resonance imaging (MRI) systems, thermal management of the gradient sub-system becomes more challenging. A heat exchanger in the MRI system cools heat-generating components by pumping water through hollow copper tubing, which also carries high electrical currents. Water is used as a coolant because of its high specific...
Recent studies provide ample evidence of the effectiveness of two-phase spray cooling at dissipating large heat fluxes from electronic devices. However, those same studies point to the difficulty predicting spray performance, given the large number of parameters that influence spray behavior. This paper provides a complete set of models/correlations that are required for designing an optimum spray...
As part of the U.S. Department of Energy (DOE) Advanced Power Electronics (APE) program, DOE's National Renewable Energy Laboratory (NREL) is currently leading a national effort to develop next-generation cooling technologies for hybrid vehicle electronics. Spray cooling has been identified as a potential solution that can dissipate 150- 200 W/cm2 while maintaining the chip temperature below 125degC...
For the reliable and continuous operation of humanoid robot, various types of multiple heat sources such as CPUs, motors, drivers should be cooled down by using compact and light-weight cooling devices. In this study, thermal performances of one metallic cold plate and two different types of non-metallic cold plates with a dielectric coolant (FC-72) as a working fluid are investigated in two-phase...
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