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Research Papers: Micro/Nanoscale Heat Transfer

Heat Transfer Behavior of Silica Nanoparticles in Pool Boiling Experiment

[+] Author and Article Information
Denitsa Milanova

 University of Central Florida, 4000 Central Florida Boulevard, Orlando, FL 32816

Ranganathan Kumar

 University of Central Florida, 4000 Central Florida Boulevard, Orlando, FL 32816rnkumar@mail.ucf.edu

J. Heat Transfer 130(4), 042401 (Mar 17, 2008) (6 pages) doi:10.1115/1.2787020 History: Received February 11, 2006; Revised March 25, 2007; Published March 17, 2008

The heat transfer characteristics of silica (SiO2) nanofluids at 0.5vol% concentration and particle sizes of 10nm and 20nm in pool boiling with a suspended heating Nichrome wire have been analyzed. The influence of acidity on heat transfer has been studied. The pH value of the nanosuspensions is important from the point of view that it determines the stability of the particles and their mutual interactions toward the suspended heated wire. When there is no particle deposition on the wire, the nanofluid increases critical heat flux (CHF) by about 50% within the uncertainty limits regardless of pH of the base fluid or particle size. The extent of oxidation on the wire impacts CHF, and is influenced by the chemical composition of nanofluids in buffer solutions. The boiling regime is further extended to higher heat flux when there is agglomeration on the wire. This agglomeration allows high heat transfer through interagglomerate pores, resulting in a nearly threefold increase in burnout heat flux. This deposition occurs for the charged 10nm silica particle. The chemical composition, oxidation, and packing of the particles within the deposition on the wire are shown to be the reasons for the extension of the boiling regime and the net enhancement of the burnout heat flux.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

Experimental setup of nanofluid pool boiling experiment

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Figure 2

Temperature-resistance calibration curve

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Figure 3

Pool boiling for pure buffer solution at different acidities

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Figure 4

Pool boiling for (a) 10nm silica in pH 10.2 at 0.5vol% concentration and (b) 20nm silica in pH 9.2 at 0.5vol% concentration

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Figure 5

Pool boiling for 10nm silica in pH 3.7 buffer at 0.5vol% concentration

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Figure 6

Pool boiling for 10nm silica at ∼pH 3 with HCl and buffer solution

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Figure 7

(a) Zeta potential versus pH and (b) particle size versus pH

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Figure 8

Burnout heat flux for silica 10nm and silica 20nm

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