Title

Dispersion And Surface Characteristics Of Nanosilica Suspensions

Keywords

Burnout heat flux; Colloidal suspension; Nanofluid

Abstract

Nanofluids consisting of nanometer-sized particles dispersed in base liquids are known to be effective in extending the saturated boiling regime and critical heat flux in pool boiling. The heat transfer characteristics of nanosilica suspensions with particle sizes of 10 and 20 nm in pool boiling with a suspended heating Nichrome wire have been analyzed. 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 silica is suspended in water with no additives, the surface potential of the nanoparticles determines their movement toward the electrodes. Particles continuously deposit on the wire and extend the burnout heat flux, influenced by the chemical composition of the nanofluids. This agglomeration allows high heat transfer through interagglomerate pores, resulting in a nearly threefold increase in burnout heat flux. Particle size, zeta potential, and the burnout heat flux values under different volume concentrations are provided. The burnout heat flux of the wire does not increase monotonically with concentration, but depends on the agglomeration characteristics, particle shape, and the hydroxylated surface of the nanoparticles. © 2009 New York Academy of Sciences.

Publication Date

1-1-2009

Publication Title

Annals of the New York Academy of Sciences

Volume

1161

Number of Pages

472-483

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1111/j.1749-6632.2008.04334.x

Socpus ID

65249161772 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/65249161772

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