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Experimental study on falling-film heat transfer enhancement of binary nanofluids.

Author(s) : LEE K. I., KIM H. J., JEONG J. H., et al.

Summary

In absorption system, the performance of the absorber is critical to the overall system performance, size and the initial. Recently, much attention has been paid to develop new working fluids. The objectives of this study are to measure the vapour absorption rate and heat transfer rate for falling film flow of binary nanofluids, and to compare each enhancement of heat transfer and mass transfer under the same conditions of nanofluids. The key parameters are the base fluid concentration of LiBr, the concentration of nanoparticles in weight %, and the kinds of the nanoparticles. The binary nanofluids are H2O/LiBr with nanoparticles of Fe (60 nm in diameter) and CNT (20 nm in diameter and 10 micrometers in length). The vapour absorption rate increases with increasing the solution mass flow rate and the concentration of Fe and CNT nanoparticles. It is found that the mass transfer enhancement is much more significant than the heat transfer enhancement in the binary nanofluids with Fe and CNT nanoparticles. It is also found that the mass transfer enhancement from the CNT nanoparticles becomes higher than that from the Fe nanoparticles. Therefore, the CNT nanoparticle seems to be a better candidate for absorption performance enhancement in H2O/LiBr absorption system.

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Pages: ICR07-B2-370

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Details

  • Original title: Experimental study on falling-film heat transfer enhancement of binary nanofluids.
  • Record ID : 2008-0178
  • Languages: English
  • Source: ICR 2007. Refrigeration Creates the Future. Proceedings of the 22nd IIR International Congress of Refrigeration.
  • Publication date: 2007/08/21

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