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Flash-Boiling and Desorption from a Mesoporous Carbon Boron Nitride Foam for Rapid Thermal Energy Storage

posted Jun 14, 2013, 8:40 AM by Timothy Fisher   [ updated Jun 16, 2013, 5:57 AM by Tim Fisher ]

Student: Jeffrey D. Engerer

Faculty: Tim Fisher

Sponsor: Air Force Research Laboratory

Summary: Technological advancement has necessitated innovations in thermal transport to match the increasing power densities resultant of continual device scaling and growing power consumption. For high-performance applications, single-phase convection cooling is no longer a viable option due to its inability to dissipate the thermal load, thus constraining the performance of the host system.  With this challenge in mind, we present a transient method for the rapid adsorption of thermal energy by flash boiling, which is induced by the rapid depressurization of the working fluid.  To further promote heat transfer, highly graphitized carbon-based foams are chosen for their high thermal conductivity, adsorptive properties, and open mesoporous structure.  A chemical surface modification of the carbon foam consisting of boron and nitrogen is utilized for its demonstrated improvement of adsorptivity. We anticipate that this combination of technologies will achieve instantaneous peak cooling rates rivaling other advanced 
technologies in a manner appropriate for transient thermal events.