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Visualization Study on Onset of Nucleate Boiling for Natural Circulation Flow in a Narrow Rectangular Channel

[+] Author Affiliations
Chunping Tian, Xiaxin Cao, Jianjun Wang, Changqi Yan, Kuan Yang, Zhiqiang Zhu

Harbin Engineering University, Harbin, China

Jianjun Xu

Nuclear Power Institute of China, Chengdu, China

Paper No. ICONE25-66224, pp. V006T08A013; 7 pages
doi:10.1115/ICONE25-66224
From:
  • 2017 25th International Conference on Nuclear Engineering
  • Volume 6: Thermal-Hydraulics
  • Shanghai, China, July 2–6, 2017
  • Conference Sponsors: Nuclear Engineering Division
  • ISBN: 978-0-7918-5784-7
  • Copyright © 2017 by ASME

abstract

Experiments on onset of nucleate boiling (ONB) have been performed for the natural circulation flow in a one-sided heated narrow rectangular channel. With fast camera putting into use, the visualization study was conducted to capture the location of ONB. The experiments were performed at pressure of 0.2 MPa and 0.3 MPa, with subcooling temperature ranging from 40 to 60 K, and heating flux ranging from 70 to 220 kW/m2. Differing from conventional channel, the superheats of wall surface in the narrow rectangular channel needed for ONB is larger, and can be predicted with Thom’s correlation in developed flow region. Moreover, the superheat needed for ONB will decrease for the existence of entrance effect. The visualization study indicated that the traditional determination of ONB will bring in more error. In this study, valuable data and image have been provided for the error analysis of ONB.

Copyright © 2017 by ASME

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