Showing papers by "Jacopo Buongiorno published in 2007"
TL;DR: In this paper, the authors studied the pool boiling characteristics of dilute dispersions of alumina, zirconia and silica nanoparticles in water and found that a significant enhancement in critical heat flux (CHF) can be achieved at modest nanoparticle concentrations (< 0.1% by volume).
806 citations
TL;DR: Transient hot-wire data on thermal conductivity of suspensions of silica and perfluorinated particles show agreement with the mean-field theory of Maxwell but not with the recently postulated microconvection mechanism.
Abstract: Transient hot-wire data on thermal conductivity of suspensions of silica and perfluorinated particles show agreement with the mean-field theory of Maxwell but not with the recently postulated microconvection mechanism. The influence of interfacial thermal resistance, convective effects at microscales, and the possibility of thermal conductivity enhancements beyond the Maxwell limit are discussed.
160 citations
TL;DR: In this article, numerical simulation has been used to investigate the effects of natural convection on measurements of the thermal conductivity of fluids by transient hot-wire methods, and a comparison of the numerical data with the experimental results obtained with a custom-built setup exploiting a short-wire geometry allows fixing an operationally useful time scale, where convective effects can be safely neglected.
Abstract: Numerical simulation has been used to investigate the effects of natural convection on measurements of the thermal conductivity of fluids by transient hot-wire methods. Comparison of the numerical data with the experimental results obtained with a custom-built setup exploiting a short-wire geometry allows fixing an operationally useful time scale, where convective effects can be safely neglected.
35 citations
Dissertation•
01 Jul 2007
TL;DR: Thesis (S.M.) as discussed by the authors, Massachusetts Institute of Technology, Dept. of Nuclear Science and Engineering, February 7, 2007, Boston, Massachusetts, USA, United States.
Abstract: Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Nuclear Science and Engineering, February 2007.
14 citations
01 Jan 2007
TL;DR: In this article, the authors reviewed the nanofluid boiling database in a quest for the critical heat flux enhancement mechanism and observed significant differences in the dynamic behavior of the hot spot at CHF.
Abstract: Nanofluids exhibit a very significant enhancement of the boiling Critical Heat Flux (CHF) at low nanoparticle concentrations. This paper reviews the nanofluid boiling database in a quest for the CHF enhancement mechanism. Briefly, buildup of a nanoparticle layer on the heated surface occurs upon boiling of nanofluids. This layer changes the surface roughness and the nucleation site density and, remarkably, can improve the surface wettability, as shown by a reduction of the static contact angle on the nanofluid-boiled surfaces. Significant differences are also observed in the dynamic behavior of the hot spot at CHF.Copyright © 2007 by ASME
5 citations
TL;DR: Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Nuclear Science and Engineering, 2006.
3 citations
22 Apr 2007
1 citations