In the last decade, microencapsulated phase change material (MPCM) slurries have been proposed and studied as novel coolants for heat transfer applications. Such applications include electronics cooling, and secondary coolants in air conditioning systems among others. Experiments have shown that MPCM’s increase the overall thermal capacity of thermal systems by taking advantage of the phase change material’s latent heat of fusion. However, research has also shown that the overall heat transfer coefficient is diminished due to a reduction in the effective thermal conductivity and increased viscosity of the slurry. For this reason, there is an urgent need to modify the content of microcapsules containing phase change material to increase their effective thermal conductivity and the overall heat transport process. Our solution consists of increasing the thermal conductivity of MPCM by adding carbon nanotubes to the shell and core of the microcapsules. Carbon nanotubes have shown to increase the thermal conductivity of liquids by 40% or more in recent experiments. In this paper, MPCM slurry containing octadecane as phase change material and multi-wall carbon nanotubes (MWCNTs) embedded in the capsule material and core are compared with pure water as heat transfer fluid. Thermal and physical properties of MPCM slurry containing carbon nanotubes were determined using a differential scanning calorimeter and concentric viscometer, respectively. Experimental convective heat transfer coefficient data for MWCNT aqueous suspensions under laminar flow and constant heat flux were determined using a bench-top heat transfer loop. Experimental heat transfer results are presented.
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ASME 2007 International Mechanical Engineering Congress and Exposition
November 11–15, 2007
Seattle, Washington, USA
Conference Sponsors:
- ASME
ISBN:
0-7918-4302-5
PROCEEDINGS PAPER
Characterization of Thermal Properties and Heat Transfer Behavior of Microencapsulated Phase Change Material Slurry and Multiwall Carbon Nanotubes in Aqueous Suspension
Jorge L. Alvarado,
Jorge L. Alvarado
Texas A&M University, College Station, TX
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Charles Marsh,
Charles Marsh
U.S. Army Corps of Engineers, Champaign, IL
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Curt Thies,
Curt Thies
Thies Technology, Inc., Henderson, NV
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Guillermo Soriano,
Guillermo Soriano
Texas A&M University, College Station, TX
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Paritosh Garg
Paritosh Garg
Texas A&M University, College Station, TX
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Jorge L. Alvarado
Texas A&M University, College Station, TX
Charles Marsh
U.S. Army Corps of Engineers, Champaign, IL
Curt Thies
Thies Technology, Inc., Henderson, NV
Guillermo Soriano
Texas A&M University, College Station, TX
Paritosh Garg
Texas A&M University, College Station, TX
Paper No:
IMECE2007-41954, pp. 1771-1777; 7 pages
Published Online:
May 22, 2009
Citation
Alvarado, JL, Marsh, C, Thies, C, Soriano, G, & Garg, P. "Characterization of Thermal Properties and Heat Transfer Behavior of Microencapsulated Phase Change Material Slurry and Multiwall Carbon Nanotubes in Aqueous Suspension." Proceedings of the ASME 2007 International Mechanical Engineering Congress and Exposition. Volume 8: Heat Transfer, Fluid Flows, and Thermal Systems, Parts A and B. Seattle, Washington, USA. November 11–15, 2007. pp. 1771-1777. ASME. https://doi.org/10.1115/IMECE2007-41954
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