Accession Number : ADA602578


Title :   Scanning Electron Microscope Studies on Aggregation Characteristics of Alumina Nanofluids


Descriptive Note : Interim rept. Jun 2011-Dec 2013


Corporate Author : SOUTHWEST RESEARCH INST SAN ANTONIO TX TARDEC FUELS AND LUBRICANTS RESEARCH FACILITY


Personal Author(s) : Jeyashekar, Nigil S


Full Text : http://www.dtic.mil/dtic/tr/fulltext/u2/a602578.pdf


Report Date : Aug 2013


Pagination or Media Count : 34


Abstract : This research study establishes the relationship between sonication parameters and overall particle volume fraction in the base fluid, to the volume fraction of nanoparticles in the aggregate cluster and overall thermal conductivity enhancement of the nanofluid. The test matrix includes two power levels, with five overall particle volume fractions at each power level, and five sonication times for each overall particle volume fraction. The research concludes that sonication time has negligible effect on cluster size and number of particles per aggregate cluster at a constant overall particle volume fraction and vice versa. The research also concludes that nanofluid with higher thermal conductivity can be obtained when cluster size is limited to 200 nm. It is recommended that future research should emphasize on particle modification, such as encapsulation, to optimize and achieve an aggregate cluster size limit of 200 nm.


Descriptors :   *AGGREGATES(MATERIALS) , *FLUIDS , *THERMAL CONDUCTIVITY , ALUMINATES , CLUSTERING , NANOPARTICLES , SCANNING ELECTRON MICROSCOPES , SCANNING ELECTRON MICROSCOPY , SIZES(DIMENSIONS) , ULTRASONICS , VOLUME


Subject Categories : Miscellaneous Materials
      Lubricants and Hydraulic Fluids


Distribution Statement : APPROVED FOR PUBLIC RELEASE