TY - JOUR
T1 - Solidification of Graphene-Assisted Phase Change Nanocomposites inside a Sphere for Cold Storage Applications
AU - Prabakaran, Rajendran
AU - Sidney, Shaji
AU - Lal, Dhasan Mohan
AU - Selvam, C.
AU - Harish, Sivasankaran
N1 - Funding Information:
Funding: R.P. acknowledges the Centre for Research, Anna University for providing Anna Centenary Research Fellowship (ACRF) (Ref No.CFR/ACRF/2015/4, Dated 21.01.2015) for the doctoral level research. S.H. acknowledges the support of the International Institute for Carbon-Neutral Energy Research (WPI-I2CNER).
Publisher Copyright:
© 2019 by the authors.
PY - 2019/9/9
Y1 - 2019/9/9
N2 - In this work, we experimentally investigated the solidification behavior of functionalized graphene-based phase change nanocomposites inside a sphere. The influence of graphene nanoplatelets on thermal transport and rheological characteristics of the such nanocomposites were also discussed. We adopted the covalent functionalization method to prepare highly stable phase change nanocomposites using commercially available phase change material (PCM) OM08 as the host matrix and graphene nanoplatelets (GnPs) with 0.1, 0.3, and 0.5 volume percentage as the nano inclusions. We report a maximum thermal conductivity enhancement of ~102 and ~46% with 0.5 vol% in the solid and liquid states, respectively. Rheological measurements show that the pure PCM shows Newtonian behavior, whereas the inclusion of GnPs leads to the transition to non-Newtonian behavior, especially at lower shear rates. Viscosity of the nanocomposite increases with an increase in the volume fraction of GnP. For 0.5 vol% of GnPs, maximum increase in viscosity was found to be ~37% at a shear rate of 1000 s−1. Time required for complete solidification decreases with the loading of GnPs. Maximum reduction in solidification time with 0.5 vol% of GnPs was ~40% for bath temperature of −10◦C.
AB - In this work, we experimentally investigated the solidification behavior of functionalized graphene-based phase change nanocomposites inside a sphere. The influence of graphene nanoplatelets on thermal transport and rheological characteristics of the such nanocomposites were also discussed. We adopted the covalent functionalization method to prepare highly stable phase change nanocomposites using commercially available phase change material (PCM) OM08 as the host matrix and graphene nanoplatelets (GnPs) with 0.1, 0.3, and 0.5 volume percentage as the nano inclusions. We report a maximum thermal conductivity enhancement of ~102 and ~46% with 0.5 vol% in the solid and liquid states, respectively. Rheological measurements show that the pure PCM shows Newtonian behavior, whereas the inclusion of GnPs leads to the transition to non-Newtonian behavior, especially at lower shear rates. Viscosity of the nanocomposite increases with an increase in the volume fraction of GnP. For 0.5 vol% of GnPs, maximum increase in viscosity was found to be ~37% at a shear rate of 1000 s−1. Time required for complete solidification decreases with the loading of GnPs. Maximum reduction in solidification time with 0.5 vol% of GnPs was ~40% for bath temperature of −10◦C.
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U2 - 10.3390/en12183473
DO - 10.3390/en12183473
M3 - Article
AN - SCOPUS:85072574209
SN - 1996-1073
VL - 12
JO - Energies
JF - Energies
IS - 18
M1 - 3473
ER -
