Constrained melting of graphene-based phase change nanocomposites inside a sphere

Rajendran Prabakaran, J. Prasanna Naveen Kumar, Dhasan Mohan Lal, C. Selvam, Harish Sivasankaran

Research output: Contribution to journalArticle

Abstract

In the present work, the melting behavior of a fatty acid-based phase change material (PCM) with the addition of functionalized graphene nanoplatelets in a spherical capsule was experimentally studied. The fatty acid-based PCM (OM 08) has been selected for the air-conditioning application with a phase change temperature of 8 °C. The PCM-based nanocomposite samples were prepared by covalent functionalization method. The volume percentage of the functionalized graphene nanoplatelets varied from 0.1 to 0.5% with an increment of 0.1%. The thermal conductivity and rheological properties of the PCM nanocomposites were measured experimentally by transient hot wire method and rheometer, respectively. The maximum enhancement in thermal conductivity for 0.5 vol% of graphene nanoplatelets was found to be ~ 102%. The rheological test found that the addition of graphene nanoplatelets in the PCM resulted in the transition of Newtonian behavior to non-Newtonian behavior at lower shear rates. The viscosity of the PCM nanocomposites increases with volume fraction. Initially the pure PCM and PCM nanocomposites were solidified individually in a spherical capsule at different bath temperatures of 2 °C and − 10 °C. Then the solidified samples were kept in a constant temperature bath at 31 °C, and the melting characteristics were studied. The melting time of the PCM nanocomposite was reduced significantly with the addition of 0.5 vol% of graphene nanoplatelets by ~ 26% and ~21% for the PCM initial temperature of − 10 °C and 2 °C, respectively.

Original languageEnglish
JournalJournal of Thermal Analysis and Calorimetry
DOIs
Publication statusPublished - Jan 1 2019

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phase change materials
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Phase change materials
Nanocomposites
nanocomposites
graphene
Melting
melting
fatty acids
capsules
Capsules
baths
Thermal conductivity
thermal conductivity
Fatty Acids
Temperature
air conditioning
rheometers
temperature
Rheometers

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

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Constrained melting of graphene-based phase change nanocomposites inside a sphere. / Prabakaran, Rajendran; Prasanna Naveen Kumar, J.; Mohan Lal, Dhasan; Selvam, C.; Sivasankaran, Harish.

In: Journal of Thermal Analysis and Calorimetry, 01.01.2019.

Research output: Contribution to journalArticle

Prabakaran, Rajendran ; Prasanna Naveen Kumar, J. ; Mohan Lal, Dhasan ; Selvam, C. ; Sivasankaran, Harish. / Constrained melting of graphene-based phase change nanocomposites inside a sphere. In: Journal of Thermal Analysis and Calorimetry. 2019.
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