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Experimental investigation on heat transfer characteristics during melting of a phase change material with dispersed TiO2 nanoparticles in a rectangular enclosure
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.
2017 (English)In: International Journal of Heat and Mass Transfer, ISSN 0017-9310, E-ISSN 1879-2189, Vol. 109, p. 134-146Article in journal (Refereed) Published
Abstract [en]

This paper presents an experimental investigation on the melting process of n-octadecane as a phase change material (PCM) with dispersed titanium oxide (TiO2) nanoparticles. Experiments were performed in a rectangular enclosure heated at constant rates from one vertical side corresponding to Rayleigh numbers in the range 0.57 x 10(8)-43.2 x 10(8) and Stefan number in the range 5.7-23.8. The rheological behavior of liquid PCM/TiO2 at the mass fractions of 2 and 4% tended to Bingham fluids, thus the melting experiment was conducted for Bingham numbers in the range 0-31.1. Heat transfer during melting was characterized by visualizing the solid-liquid interface as well as recording the temperature distribution in the enclosure. Experimental results showed that at the initial stage of melting, heat transferred by conduction, and at later times, natural convection dominated heat transfer. Dispersing TiO2 nanoparticles led to increase in Bingham number and consequently the natural convection and melting rate deteriorated. Two correlations were proposed to predict the Nusselt number and melted volume fraction as a function of Fourier number, Rayleigh number, Stefan number, Bingham number and mass fraction of nanoparticles.

Place, publisher, year, edition, pages
PERGAMON-ELSEVIER SCIENCE LTD , 2017. Vol. 109, p. 134-146
Keywords [en]
PCM, Nanoparticles, Melting process, Non-Newtonian, Natural convection
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:kth:diva-207871DOI: 10.1016/j.ijheatmasstransfer.2017.01.109ISI: 000400227300012Scopus ID: 2-s2.0-85011805117OAI: oai:DiVA.org:kth-207871DiVA, id: diva2:1102699
Note

QC 20170530

Available from: 2017-05-30 Created: 2017-05-30 Last updated: 2017-05-30Bibliographically approved

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Khodabandeh, Rahmatollah

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