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Heat Transfer Enhancement

Quantification of the Impact of Embedded Graphite Nanofibers on the Transient Thermal Response of Paraffin Phase Change Material Exposed to High Heat Fluxes

[+] Author and Article Information
Kireeti Chintakrinda, Ronald J. Warzoha

Department of Mechanical Engineering,  Villanova University, 800 Lancaster Avenue, Villanova, PA 19085

Randy D. Weinstein

Department of Chemical Engineering,  Villanova University, 800 Lancaster Avenue, Villanova,PA 19085

Amy S. Fleischer1

Department of Mechanical Engineering,  Villanova University, 800 Lancaster Avenue, Villanova, PA 19085amy.fleischer@villanova.edu

1

Author to whom correspondences should be addressed.

J. Heat Transfer 134(7), 071901 (May 22, 2012) (10 pages) doi:10.1115/1.4006008 History: Received December 17, 2010; Revised October 19, 2011; Published May 22, 2012; Online May 22, 2012

Paraffin phase change material (PCM) is enhanced with suspended graphite nanofibers at high loading levels. The loading levels reach in excess of 10% by weight. The thermal effects of the nanofiber loading level, the PCM module design, and the applied power density on the transient thermal response of the system are examined. A strong effect of nanofiber loading level on thermal performance is found, including a suppression of Rayleigh-Benard convection currents at high loading levels. Increases in nanofiber loading level also result in lowered heating rates and greater thermal control of the heated base. Increases in power density are found to result in higher heating rates, and increases in mass lead to lower operating temperatures. The design of the module is found to have a strong effect on thermal performance.

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Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

PCM module illustrating thermocouple hole spacing

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Figure 2

Transient thermal response of 5.08 cm cubic module with paraffin PCM and 150 W applied power (5.8 W/cm2 )

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Figure 3

Transient thermal response of 5.08 cm cubic module with 5.5 wt. % GNF/PCM and 150 W applied power (5.8 W/cm2 )

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Figure 4

Transient thermal response of 5.08 cm cubic module with 11 wt. % GNF/PCM and 150 W applied power (5.8 W/cm2 )

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Figure 5

Comparison of the heating rate for 5.08 cm cubic samples subjected to a 150 W applied load (5.8 W/cm2 )

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Figure 6

Transient thermal response of 5.08 cm cubic module with pure paraffin PCM and 300 W applied power (11.6 W/cm2 )

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Figure 7

Transient thermal response of 5.08 cm cubic module with 5.5 wt. % GNF/PCM and 300 W applied power (11.6 W/cm2 )

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Figure 8

Transient thermal response of 5.08 cm cubic module with 11 wt. % GNF/PCM and 300 W applied power (11.6 W/cm2 )

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Figure 9

Transient thermal response of 5.08 cm cubic module with 5.5 wt. % GNF/PCM at the “Bottom” thermocouple for various power densities

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Figure 10

Transient thermal response of 10.16 cm cubic module with 5.5 wt. % GNF/PCM at the “Bottom” thermocouple for various power densities

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Figure 11

Transient thermal response of different module designs with 5.5 wt. % GNF/PCM samples to 150 W applied power at the “bottom” thermocouple location

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Figure 12

Transient thermal response of different module designs with 5.5 wt. % GNF/PCM samples to 300 W applied power at the bottom thermocouple location

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