Enhanced flow boiling in a microchannel with integration of nanowires

Convective heat transfer performance of a micro-channel with copper nanowires (CuNWs) coatings has been investigated experimentally. Experimental studies were carried out on a bottom surface heated single micro-channel of 672 μm hydraulic diameter using de-ionized (DI) water as coolant. Nanowires we...

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Bibliographic Details
Published in:Applied thermal engineering 2012, Vol.32 (1), p.68-75
Main Authors: Morshed, A.K.M.M., Yang, Fanghao, Yakut Ali, M., Khan, Jamil A., Li, Chen
Format: Article
Language:English
Subjects:
Applied sciences
Boiling
Coatings
Convective heat transfer
Coolants
Copper nanowires
Deposition
Energy
Energy. Thermal use of fuels
Exact sciences and technology
Flow boiling
Heat transfer
Microchannel
Microchannels
Nanowires
Pressure drop
Theoretical studies. Data and constants. Metering
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Summary:Convective heat transfer performance of a micro-channel with copper nanowires (CuNWs) coatings has been investigated experimentally. Experimental studies were carried out on a bottom surface heated single micro-channel of 672 μm hydraulic diameter using de-ionized (DI) water as coolant. Nanowires were directly grown on the bottom surface of the micro-channel using electrochemical deposition technique. Both single-phase and two-phase convective heat transfer experiments were performed at different mass flux and different degree of sub-cooling. The results from microchannel with bare surface are used as the baseline data. CuNWs coatings have been found to enhance single-phase heat transfer rate by up to ∼25%, whereas in the flow boiling regime, the enhancement was up to ∼56% with a pressure drop increase by ∼20% in the single-phase regime. The obvious change of pressure drop in the fully developed boiling regime was not observed. ► CuNWs coating reduces surface superheat temperature for the onset of nucleate boiling by 4–12 °C depending on the flow rate. ► CuNWs coating does not show any significant effects in managing the two-phase flow instability. ► CuNWs coating enhances flow boiling heat transfer rate up to ∼56%. ► CuNWs coated surfaces are more effective at lower degree of sub-cooling.
ISSN:1359-4311
DOI:10.1016/j.applthermaleng.2011.08.031