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Orientation Effects in Two-Phase Microgap FlowThe high power density of emerging electronic devices is driving the transition from remote cooling, which relies onconduction and spreading, to embedded cooling, which extracts dissipated heat on-site. Two-phase microgap coolersemploy the forced flow of dielectric fluids undergoing phase change in a heated channel within or between devices. Such coolers must work reliably in all orientations for a variety of applications (e.g., vehicle-based equipment), as well as in microgravity and high-g for other applications (e.g., spacecraft and aircraft). The lack of acceptable models andcorrelations for orientation- and gravity-independent operation has limited the use of two-phase coolers in suchapplications. Previous research has revealed that gravitational acceleration plays a diminishing role in establishing flow regimes and transport rates as the channel size shrinks, but there is considerable variation among the proposed microscale criteria and limited research on two-phase flows in low aspect ratio microgap channels. Reliable criteria for achieving orientation- and gravity-independent flow boiling would enable emerging systems to exploit this thermal management technique and streamline the technology development process.
Document ID
20180006653
Acquisition Source
Goddard Space Flight Center
Document Type
Presentation
Authors
Robinson, Franklin L. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Bar-Cohen, Avram (Maryland Univ. College Park, MD, United States)
Date Acquired
October 24, 2018
Publication Date
August 29, 2018
Subject Category
Fluid Mechanics And Thermodynamics
Report/Patent Number
GSFC-E-DAA-TN60530
Meeting Information
Meeting: 2018 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems (InterPACK)
Location: San Francisco, CA
Country: United States
Start Date: August 27, 2018
End Date: August 30, 2018
Sponsors: American Society of Mechanical Engineers
Distribution Limits
Public
Copyright
Use by or on behalf of the US Gov. Permitted.
Keywords
orientation
microgap
nucleation
inclination
Flow boiling
microchannel

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