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Convective heat transfer performance of aggregate-laden nanofluids

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Author

Summary, in English

With the recent progress in nanotechnology, nanofluids are emerging as a new class of heat transfer fluids formed by adding nanometer-sized structures (e.g., particles, fibers, tubes) in conventional base fluids (e.g., water, ethylene glycol, engine oil). Due to attractive van der Waals forces, nanoparticles tend to agglomerate to form aggregates in nanofluids to form the so-called aggregate-laden nanofluids. Aggregation affects the nanofluid properties such as thermal conductivity and viscosity and further affects the heat transfer performance. The discrepancies regarding the influence of nanoparticles on thermophysical properties and heat transfer characteristics in the literature might arise due to nanoparticle aggregation. Firstly, three performance comparison criteria for nanofluids were proposed for thermally developing laminar flow, fully developed laminar flow and fully developed turbulent flow to evaluate the nanofluid efficiency as coolants. Secondly, parametric effects of aggregates on nanofluid viscosity and thermal conductivity were investigated. The cooling efficiency of the aggregate-laden nanofluids depends on aggregate parameters such as aggregate ratios, interfacial thermal resistance, volume fraction of aggregates in nanofluids and volume fraction of nanoparticles in the aggregates. One method to tailor the aggregate morphology is presented by dispersing nanoparticles of different size into a base fluid. By this method, the volume fraction of nanoparticles in the aggregates might increase, which thus enhances the nanofluid effectiveness due to reduction of viscosity.

Publishing year

2016

Language

English

Pages

1107-1115

Publication/Series

International Journal of Heat and Mass Transfer

Volume

93

Document type

Journal article

Publisher

Pergamon Press Ltd.

Topic

  • Nano Technology
  • Energy Engineering

Keywords

  • Aggregate
  • Nanofluid
  • Performance comparison criterion
  • Heat transfer
  • Thermal conductivity
  • Viscosity

Status

Published

Research group

  • heat transfer

ISBN/ISSN/Other

  • ISSN: 0017-9310