Effects of Porous Superhydrophilic Surfaces on Flow Boiling Critical Heat Flux

Dr Reza Azizian (Department of Nuclear Science and Engineering, Massachusetts Institute of Technology)


DATE: 2015-06-04
TIME: 11:00:00 - 12:00:00
LOCATION: Graduate Teaching Room (Ian Ross Building)
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Many important industrial applications, such as high-powered electronics, nuclear reactors and refrigeration systems, rely on nucleate boiling to remove large heat fluxes from a heated surface. While nucleate boiling is a very effective heat transfer mechanism, it is well known that there exists a critical value of heat flux at which nucleate boiling transients to film boiling. In most practical applications it is imperative to maintain the operating heat flux below such a critical value, termed the critical heat flux (CHF). Effects of different surface characterizations on pool boiling CHF in water were examined earlier by our group using engineered surfaces. In this presentation I will present the significance of our work, and the significance of surface characteristics on pool boiling CHF. I will also provide a new set of experimental data on the effect of surface characteristics on a prototypical engineering surface of practical interest, namely air-oxidized low-carbon steel, under flow boiling conditions.

Note: In the latter part of the presentation, and given the recent release of an MIT report titled The Future of Solar Energy, the speaker will present research findings and technology developments on behalf of his MIT colleagues in the solar thermal area, based on the work conducted at the MIT Energy Initiative, and the MIT-Masdar Institute Cooperative program.

Reza Azizian is a Postdoctoral Associate at the Massachusetts Institute of Technology. His areas of technical expertise are nanofluid technology, fluid dynamics, heat transfer and two phase flow. He received his PhD from the University of Newcastle in Australia in 2013. He is the author and co-author of 14 articles in refereed journals and peer-reviewed conference proceedings. His paper on magnetite nanofluids in IJHMT ranked as the 4th most-read article in 2013 in that journal. He received his MSc. degree in 2009 from Eastern Mediterranean University, where he worked at the Energy Research Center as a research assistant.

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