The heat transfer characteristics of silica nanofluids at concentration and particle sizes of and in pool boiling with a suspended heating Nichrome wire have been analyzed. The influence of acidity on heat transfer has been studied. The 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 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 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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Research Papers
Heat Transfer Behavior of Silica Nanoparticles in Pool Boiling Experiment
Denitsa Milanova,
Denitsa Milanova
University of Central Florida
, 4000 Central Florida Boulevard, Orlando, FL 32816
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Ranganathan Kumar
e-mail: rnkumar@mail.ucf.edu
Ranganathan Kumar
University of Central Florida
, 4000 Central Florida Boulevard, Orlando, FL 32816
Search for other works by this author on:
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 32816e-mail: rnkumar@mail.ucf.edu
J. Heat Transfer. Apr 2008, 130(4): 042401 (6 pages)
Published Online: March 17, 2008
Article history
Received:
February 11, 2006
Revised:
March 25, 2007
Published:
March 17, 2008
Citation
Milanova, D., and Kumar, R. (March 17, 2008). "Heat Transfer Behavior of Silica Nanoparticles in Pool Boiling Experiment." ASME. J. Heat Transfer. April 2008; 130(4): 042401. https://doi.org/10.1115/1.2787020
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