Modeling the Effect of Agglomeration in Nanoparticle Coolant Systems Using Dynamic Light Scattering

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Abstract:

The objective of this research was to investigate Nanofluids as new class of heat transfer fluids. Nanofluids were characterized using Dynamic Light Scattering DLS by obtaining volume fraction of aggregated nanoparticles as a function of aggregate radius. This data was used as an input to three analytical models to compute the overall thermal conductivity of the nanofluid. Stability analysis on alumina nanofluid 1 by vol. indicated that the formation of aggregates was limited by diffusion and was primarily confined to the nanometer size range. A comparative study between dilute and regular alumina nanofluids concluded that the relationship between nanoparticle concentration and enhancement in thermal conductivity is nearly linear at both concentration regimes. Experiments on alumina nanofluids with 1 to 5 by volume concentration provided thermal conductivity enhancement up to 35. This result concludes that aggregation of nanoparticles play a critical role in enhancement of thermal conductivity in nanofluids.

Author(s):
Jeyashekar, Nigil ; Johnson, James E. ; Hutzler, Scott E. ; Frame, Edwin A.
Author Organization(s):
SOUTHWEST RESEARCH INST SAN ANTONIO TX TARDEC FUELS AND LUBRICANTS RESEARCH FACILITY
Descriptive Note:
Interim rept. Feb 2009-Jan 2012
Pagination:
0035

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release
Distribution Statement:
Approved For Public Release; Distribution Is Unlimited.

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
TFLRF-420
Contract/Grant Number(s):
W56HZV-09-C-0100
Monitor Series:
TARDEC
 Subject Terms
Joint Capability Areas:
JCA_5_Command and Control; JCA_5.3_Planning; JCA_1.2.7_Experimentation; JCA_4.2_Supply; JCA_4.2.3_Manage Global Supplier Networks; JCA_1.2.5_Lessons Learned
Communities of Interest:
Materials and Manufacturing Processes
Descriptor(s):
*NANOPARTICLES, *THERMAL CONDUCTIVITY, AGGLOMERATES, AGGREGATES(MATERIALS), CONDUCTIVITY, COOLING AND VENTILATING EQUIPMENT, DILUTION, DYNAMICS, FLUIDS, LIGHT SCATTERING, MATHEMATICAL MODELS, MODELS, OPTIMIZATION, STABILITY
Field(s)/Group(s):
Electrical and Electronic Equipment, Air Conditioning, Heating, Lighting and Ventilating, Thermodynamics
Keyword(s):
NANOFLUID, DYNAMIC LIGHT SCATTERING, THERMAL CONDUCTIVITY
Report Date:
2011 Jan 01
Creation Date:
2013 Apr 22