Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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CRITICAL HEAT FLUX ENHANCEMENT IN FLOW BOILING OF Al2O3 AND SiC NANOFLUIDS UNDER LOW PRESSURE AND LOW FLOW CONDITIONS

  • Lee, Seung-Won (Interdisciplinary School of Green Energy, Ulsan National Institute of Science and Technology (UNIST)) ;
  • Park, Seong-Dae (Interdisciplinary School of Green Energy, Ulsan National Institute of Science and Technology (UNIST)) ;
  • Kang, Sa-Rah (Interdisciplinary School of Green Energy, Ulsan National Institute of Science and Technology (UNIST)) ;
  • Kim, Seong-Man (Interdisciplinary School of Green Energy, Ulsan National Institute of Science and Technology (UNIST)) ;
  • Seo, Han (Interdisciplinary School of Green Energy, Ulsan National Institute of Science and Technology (UNIST)) ;
  • Lee, Dong-Won (Korea Atomic Energy Research Institute (KAERI)) ;
  • Bang, In-Cheol (Interdisciplinary School of Green Energy, Ulsan National Institute of Science and Technology (UNIST))
  • Received : 2011.10.30
  • Accepted : 2012.02.27
  • Published : 2012.05.25
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Abstract

Critical heat flux (CHF) is the thermal limit of a phenomenon in which a phase change occurs during heating (such as bubbles forming on a metal surface used to heat water), which suddenly decreases the heat transfer efficiency, thus causing localized overheating of the heating surface. The enhancement of CHF can increase the safety margins and allow operation at higher heat fluxes; thus, it can increase the economy. A very interesting characteristic of nanofluids is their ability to significantly enhance the CHF. Nanofluids are nanotechnology-based colloidal dispersions engineered through the stable suspension of nanoparticles. All experiments were performed in round tubes with an inner diameter of 0.01041 m and a length of 0.5 m under low pressure and low flow (LPLF) conditions at a fixed inlet temperature using water, 0.01 vol.% $Al_2O_3$/water nanofluid, and SiC/water nanofluid. It was found that the CHF of the nanofluids was enhanced and the CHF of the SiC/water nanofluid was more enhanced than that of the $Al_2O_3$/water nanofluid.

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References

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