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Rheological Characteristics of Nanoparticle Compound Microencapsulated Phase Change Material Suspension

[+] Author Affiliations
Liang Wang, Guiping Lin

Beihang University, Beijing, China

Yulong Ding

University of Leeds, Leeds, UK

Paper No. HT2009-88227, pp. 311-315; 5 pages
doi:10.1115/HT2009-88227
From:
  • ASME 2009 Heat Transfer Summer Conference collocated with the InterPACK09 and 3rd Energy Sustainability Conferences
  • Volume 3: Combustion, Fire and Reacting Flow; Heat Transfer in Multiphase Systems; Heat Transfer in Transport Phenomena in Manufacturing and Materials Processing; Heat and Mass Transfer in Biotechnology; Low Temperature Heat Transfer; Environmental Heat Transfer; Heat Transfer Education; Visualization of Heat Transfer
  • San Francisco, California, USA, July 19–23, 2009
  • Conference Sponsors: Heat Transfer Division
  • ISBN: 978-0-7918-4358-1 | eISBN: 978-0-7918-3851-8
  • Copyright © 2009 by ASME

abstract

Microencapsulated phase change material (MPCM) suspensions have large specific heat due to the latent heat of the phase change material and enhance the convective heat transfer consequently. However low thermal conductivity of the phase change material diminishes the heat transfer performance of the MPCM suspensions. To improve the thermal conductivity of the MPCM suspensions, TiO2 nanoparticles were added into the MPCM suspensions to formulate a novel thermal fluid—nanoparticle compound microencapsulated phase change material suspensions. In this paper, the rheological characteristics and shear viscosities of such slurries using a Bolin CVO rheometer (Malvern Instruments) over a range of shear rate (5–500s−1 ), MPCM concentration (0–20wt%) and TiO2 nanoparticle concentration 0.5wt% at temperature (20°C–40°C). The result shows that the viscosities of NCMPCM suspensions are almost independent of the shear rate, indicating Newtonian fluid under the conditions of this work and the viscosities depend strongly on temperature which fits well with the VTF function. Based on the effective volume fraction method and Vand equation, two methods that predict the viscosity of nanoparticle compound microencapsulated phase change material suspensions was analyzed and the result shows that the prediction data the effective volume fraction method fit the measurements well.

Copyright © 2009 by ASME

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