Heat transfer of nanofluids - boom or bust
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Date
Authors
Buongiornoa, J.
Hu, Lin-wen
Journal Title
Journal ISSN
Volume Title
Publisher
International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics
Abstract
Paper presented at the 7th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Turkey, 19-21 July, 2010.
Significant controversy over reports of extraordinary heat transfer in nanofluids has existed. The results of work performed by our group to help resolve some of these issues will be discussed. Heat transfer in fluids is complex and includes phenomena such as conduction (thermal conductivity), convection (laminar and turbulent), and boiling. The results of tests performed with custom experimental apparatuses, including transient hot wire, pool boiling, quench, flow loops, and high-speed infrared (IR) thermography and digital imaging, will be discussed. Additionally, single phase pressure drop measurements for nanofluids will be presented. It will be shown that the effect of nanofluids on pressure drop and conductive and convective heat transfer can be explained by existing theories, if a nanofluid’s thermophysical properties are used. However, the enhancement of boiling heat transfer, particularly critical heat flux and quenching, is more challenging to interpret using existing theory because of surface effects. Accordingly, the insights gained from measurements of contact angle, IR imaging, and morphological data will be presented.
Significant controversy over reports of extraordinary heat transfer in nanofluids has existed. The results of work performed by our group to help resolve some of these issues will be discussed. Heat transfer in fluids is complex and includes phenomena such as conduction (thermal conductivity), convection (laminar and turbulent), and boiling. The results of tests performed with custom experimental apparatuses, including transient hot wire, pool boiling, quench, flow loops, and high-speed infrared (IR) thermography and digital imaging, will be discussed. Additionally, single phase pressure drop measurements for nanofluids will be presented. It will be shown that the effect of nanofluids on pressure drop and conductive and convective heat transfer can be explained by existing theories, if a nanofluid’s thermophysical properties are used. However, the enhancement of boiling heat transfer, particularly critical heat flux and quenching, is more challenging to interpret using existing theory because of surface effects. Accordingly, the insights gained from measurements of contact angle, IR imaging, and morphological data will be presented.
Description
Keywords
Heat transfer in nanofluids, Heat transfer in fluids, Thermal conductivity, Laminar and turbulent convection, Single phase pressure drop
Sustainable Development Goals
Citation
McKrell, T, Buongiornoa, J & Hu, L-W 2010, 'Heat transfer of nanofluids - boom or bust', Paper presented to the 7th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Turkey, 19-21 July 2010.