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Technical Briefs

Alumina Nanoparticles Enhance the Flow Boiling Critical Heat Flux of Water at Low Pressure

[+] Author and Article Information
Sung Joong Kim, Thomas McKrell

Nuclear Science and Engineering Department, Massachusetts Institute of Technology, Cambridge, MA 02139

Jacopo Buongiorno

Nuclear Science and Engineering Department, Massachusetts Institute of Technology, Cambridge, MA 02139jacopo@mit.edu

Lin-Wen Hu

Nuclear Reactor Laboratory, Massachusetts Institute of Technology, Cambridge, MA 02139

In our laboratory, we ran single-phase convective heat transfer experiments with electrically heated wires and found no deposition of nanoparticles on the wire surface. Therefore, nanoparticle deposition is caused by boiling.

J. Heat Transfer 130(4), 044501 (Mar 18, 2008) (3 pages) doi:10.1115/1.2818787 History: Received January 09, 2007; Revised April 02, 2007; Published March 18, 2008

Many studies have shown that addition of nanosized particles to water enhances the critical heat flux (CHF) in pool boiling. The resulting colloidal dispersions are known in the literature as nanofluids. However, for most potential applications of nanofluids the situation of interest is flow boiling. This technical note presents first-of-a-kind data for flow boiling CHF in nanofluids. It is shown that a significant CHF enhancement (up to 30%) can be achieved with as little as 0.01% by volume concentration of alumina nanoparticles in flow experiments at atmospheric pressure, low subcooling (<20°C), and relatively high mass flux (1000kgm2s).

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

The flow loop test section

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Figure 2

Wall temperature and heat flux history in a typical CHF run. Note the rapid temperature excursion at CHF.

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Figure 3

Measured values of the CHF for water and 0.01% by volume alumina nanofluid at atmospheric pressure.

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Figure 4

Test-section burnout due to CHF in water (a) and nanofluid (b).

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