作者: Joohyun Lee , Yong-Jin Yoon , John K. Eaton , Kenneth E. Goodson , Seoung Jai Bai
DOI: 10.1007/S12541-014-0390-1
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摘要: Oxide and CNT nanoparticles were prepared characterized to understand the effect of disaggregation on thermal conductivity viscosity nanofluids through experimental theoretical analysis. The oxide contained spherical nanoparticles, including Al2O3, CuO, ZnO, multiwalled carbon nanotubes in deionized water. Aggregations numerous observed from Dynamic Light Scattering Scanning Electron Microscopy. Ultrasonication centrifugation made mechanically separate agglomerated nanoparticles. Nanoparticle size decreased by 15% with one hour sonication for diameters range 10∼100 nm methods showed 36% 40% reduction Al2O3/DI water CuO/DI nanofluid, respectively. A chemical based method using surfactants changing pH performed. significant was achieved a value 4.2. effects agglomeration examined three-level homogenization model. use hydrodynamic particle nanofluid shows an effective viscosity, when aspect ratio aggregation is below 4.1 2.5 CuO/water Al2O3/water