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Effect of particle volume fraction on spray heat transfer using Al2O3-water nanofluid.

Number: pap. ID: 197

Author(s) : CHANG T. B., SYU S. C., YANG Y. K.

Summary

The spray cooling is a very effective heat transfer mode. Using a 35-nm Al2O3-particle–water nanofluid as working fluid, the effects of particle volume fraction on the spray heat transfer performance were investigated experimentally in this study. The tested surface was a flat, horizontal and circular heated surface. The tests were realized for the following ranges of the governing parameters: the nozzle orifice diameter is 2.3 mm and the distance nozzle-to-heated-surface was set to 17 mm; the spray mass flow rate varies from 0.021 to 0.056 kg/s. In addition, four different particle volume fractions (0, 0.001, 0.025, and 0.05 Vol%) were specially prepared to determine the proper particle volume fraction. It is shown that the optimal heat transfer performance is obtained using a particle volume fraction of 0.001 Vol%. After finishing spray cooling experiments, SEM was used to analyze the compositions of various heated surfaces for different particle volume fractions. A few Al-elements were detected on heated surface for 0.025 and 0.05 Vol% but no Al was found for 0 and 0.001Vol%.

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Pages: 9 p.

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Details

  • Original title: Effect of particle volume fraction on spray heat transfer using Al2O3-water nanofluid.
  • Record ID : 30001630
  • Languages: English
  • Source: Proceedings of the 23rd IIR International Congress of Refrigeration: Prague, Czech Republic, August 21-26, 2011. Overarching theme: Refrigeration for Sustainable Development.
  • Publication date: 2011/08/21

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