한국가시화정보학회지 (Journal of the Korean Society of Visualization)

  • 제22권3호
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  • Pages.70-77
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  • 2024
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  • 1598-8430(pISSN)
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  • 2093-808X(eISSN)
한국가시화정보학회 (The Korean Society of Visualization)
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Rainbow Schlieren Deflectometry를 이용한 과냉수 내 비등 기포 계면에서의 응축열전달 측정

Measurement of condensation heat transfer at the interface of boiling bubble in subcooled water using Rainbow Schlieren Deflectometry

  • Jihoon Han (Department of Nuclear Engineering, Kyung Hee University) ;
  • Hyungdae Kim (Department of Nuclear Engineering, Kyung Hee University)
  • 투고 : 2024.10.04
  • 심사 : 2024.11.10
  • 발행 : 2024.11.30
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초록

The objective of this study is to experimentally measure condensation heat transfer at the vapor-liquid interface of boiling bubbles generated in subcooled water. Rainbow Schlieren Deflectometry (RSD) is an optical technique that allows for the non-intrusive visualization of the temperature gradient field in liquid. It is known that the refractive index of a liquid changes as a function of temperature. When light passes through a liquid medium, the degree of deflection is proportional to the spatial gradient of the temperature field. The deflected light passes through a rainbow filter with a continuous variation in color from the center to the outer boundary. As a result, the temperature gradient field in the liquid can be visualized as a color contour. Boiling experiments in a pool of subcooled water were conducted to visualize the temperature gradient field near the vapor-liquid interface of a vapor bubble. A set of RSD images was obtained for the entire life cycle of a boiling bubble, from nucleation through growth to departure from the heating wall. The temperature gradient field near the vapor-liquid interface around the bubble was carefully analyzed. The condensation heat transfer coefficient was calculated and compared to existing prediction models.

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과제정보

본 논문은 경희대학교 대학원 4단계 BK21 대학원혁신 사업으로부터 지원받은 연구임(GS-1-JX-ON- 20230359)

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