한국안전학회지 (Journal of the Korean Society of Safety)

  • 제35권5호
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  • Pages.128-136
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  • 2020
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  • 1738-3803(pISSN)
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  • 2383-9953(eISSN)
한국안전학회 (The Korean Society of Safety)
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고온 시편의 급랭 시 산화철 나노유체가 최소막비등점에 미치는 영향에 대한 실험적 연구

Experimental Study on Effect of Water-based Iron(III) Oxide Nanofluid on Minimum Film Boiling Point During Quenching of Highly Heated Test Specimen

  • 정찬석 (부경대학교 건축.소방공학부) ;
  • 황경섭 (부경대학교 건축.소방공학부) ;
  • 이치영 (부경대학교 소방공학과)
  • Jeong, Chan Seok (Division of Architectural and Fire Protection Engineering, Pukyong National University) ;
  • Hwang, Gyeong Seop (Division of Architectural and Fire Protection Engineering, Pukyong National University) ;
  • Lee, Chi Young (Department of Fire Protection Engineering & Division of Architectural and Fire Protection Engineering, Pukyong National University)
  • 투고 : 2020.07.14
  • 심사 : 2020.08.21
  • 발행 : 2020.10.31
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초록

In the present experimental study, the effect of water-based iron(III) oxide nanofluid on the MFB(Minimum Film Boiling) point during quenching was investigated. As the highly heated test specimen, the cylindrical stainless steel rod was used, and as the test fluids, the water-based iron(III) oxide nanofluids of 0.001 and 0.01 vol% concentrations were prepared with the pure water. To examine the effect of location in the test specimen, the thermocouples were installed at the bottom and middle of wall, and center in the test specimen. Through a series of experiments, the experimental data about the influences of nanofluid concentrations, the number of repeated experiments, and locations in the test specimen on the reaching time to MFB point, MFBT(Minimum Film Boiling Temperature), and MHF(Minimum Heat Flux) were obtained. As a result, with increasing the concentration of nanofluid and the number of repeated experiments, the reaching time to MFB point was reduced, but the MFBT and MHF were increased. In addition, it was found that the effect of water-based iron(III) oxide nanofluid on the MFB point at the bottom of wall in the test specimen was observed to be greater than that at the middle of wall and center. In the present experimental ranges, as compared with the pure water, the water-based iron(III) oxide nanofluid showed that the maximum reduction of reaching time to MFB point was about 53.6%, and the maximum enhancements of MFBT and MHF were about 31.1% and 73.4%, respectively.

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참고문헌

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