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/cm2 with water as fluid for ZnO on Al versus a CHF of 23.2 W/cm2 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 ~ 23000 W/m2K. We discuss our data and compare the behavior with conventional boiling theory.
Revised: August 2, 2011 |
Published: April 21, 2010
Citation
Hendricks T.J., S. Krishnan, C. Choi, C. Chang, and B. Paul. 2010.Enhancement of Pool-Boiling Heat Transfer using Nanostructured Surfaces on Aluminum and Copper.International Journal of Heat and Mass Transfer 53, no. 15-16:3357-3365. PNWD-SA-8866. doi:10.1016/j.ijheatmasstransfer.2010.02.025