Journal
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
Volume 53, Issue 15-16, Pages 3357-3365Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijheatmasstransfer.2010.02.025
Keywords
Nanoscale heat transfer; Boiling enhancement; Electronic cooling
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Funding
- Army Research Laboratory [W911NF-07-2-0083]
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Enhanced pool-boiling critical heat fluxes (CHF) at reduced wall superheat on nanostructured substrates are reported. Nanostructured surfaces were realized using a low temperature process, microreactor-assisted-nanomaterial-deposition. Using this technique we deposited ZnO nanostructures on Al and Cu substrates. We observed pool-boiling CHF of 82.5 W/cm(2) with water as fluid for ZnO on Al versus a CHF of 23.2 W/cm(2) on bare Al surface with a wall superheat reduction of 25-38 C. These CHF values on ZnO surfaces correspond to a heat transfer coefficient of similar to 23,000 W/m(2) K. We discuss our data and compare the behavior with conventional boiling theory. (C) 2010 Elsevier Ltd. All rights reserved.
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