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Title of Journal: Heat Mass Transfer

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Abbravation: Heat and Mass Transfer

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Springer Berlin Heidelberg

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DOI

10.1007/bf00630069

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ISSN

1432-1181

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Enhanced thermal conductivity of Emphasis Type="I

Authors: Sadegh Motahar Ali A Alemrajabi Rahmatollah Khodabandeh
Publish Date: 2015/09/24
Volume: 52, Issue: 8, Pages: 1621-1631
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Abstract

In the present study carbonbased nanomaterials including multiwalled carbon nanotubes MWCNTs and vaporgrown carbon nanofibers CNFs were dispersed in noctadecane as a phase change material PCM at various mass fractions of 05 1 2 and 5 wt by the twostep method The transient plane source technique was used to measure thermal conductivity of samples at various temperatures in solid 5–25 °C and liquid 30–55 °C phases The experimental results showed that thermal conductivity of the composites increases with increasing the loading of the MWCNTs and CNFs A maximum thermal conductivity enhancement of 36  at 5 wt MWCNTs and 5 °C as well as 50  at 2 wt and 55 °C were experimentally obtained for noctadecane/MWCNTs samples Dispersing CNFs into noctadecane raised the thermal conductivity up to 18  at 5 wt and 10 °C and 21  at 5 wt and 55 °C However the average enhancement of 19 and 21  for solid and liquid phases of MWCNTs composite as well as 33 and 46  for solid and liquid phase of CNFs promised a better heat transfer characteristics of MWCNTs in noctadecane A comparison between results of the present work and available literature revealed a satisfactory enhancement of thermal conductivity For the investigated noctadecane/MWCNTs and noctadecane/CNFs composites a new correlation was proposed for predicting the thermal conductivity as a function of temperature and nanomaterials loading

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