This letter discusses experimentation with optically induced phase change in nanoparticle liquid suspensions-commonly termed nanofluids. Four different types of nanofluids at five concentrations were exposed to a similar to 120 mW, 532 nm laser beam to determine the minimum laser flux needed to create vapor. Laser irradiance was varied between 0-770 W cm(-2). While the experiments were simple, they involved many complex, interrelated physical phenomena, including: subcooled boiling, thermal driven particle/bubble motion, nanoparticle radiative absorption/scattering, and nanoparticle clumping. Such phenomena could enable novel solar collectors in which the working fluid directly absorbs energy and undergoes phase change in a single step. c 2009 American Institute of Physics. [doi: 10.1063/1.3250174]
Copyright 2009 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics along with the following message: The following article appeared in Applied Physics Letters Volume 95, Issue 16, and may be found at http://apl.aip.org/resource/1/applab/v95/i16/p161907_s1.
Taylor, R.A., Phelan, P.E., Otanicar, T., Adrian, R.J., and Prasher, P.S., 2009, "Vapor Generation in a Nanoparticle Liquid Suspension Using a Focused, Continuous Laser," Applied Physics Letters, 95(16).