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Boiling 2000 Phenomena and Emerging Applications Volume 2

ISSN:
1-56700-148-3 (Print)

Narrow Space Heat Transfer in Vertical Annulus with Inner-Side Heating

Xiu-Zhong Shen
School of Power and Energy Engineering, Shanghai Jiao-Tong University

Satoshi Imura
Department of Nuclear Engineering, Graduate School of Engineering, Osaka University

Keiji Miyazaki
Department of Nuclear Engineering, Graduate School of Engineering, Osaka University

Ji-Jun Xu
School of Power and Energy Engineering, Shanghai Jiao-Tong University

Hiroshi Horiike
Department of Nuclear Engineering, Graduate School of Engineering, Osaka University

Abstract

Heat transfer characteristic in a confined space has been studied for vertical narrow annuli with one-side heating. Experiments are performed for stilled water at 101325 Pa or so for annuli with heating section of 0.9 m and gap widths of 0.75 mm. The testing section is heated from inner side. The flow rates change from 1.66667 × 10−5 m3/s to 5.83335 × 10−5 m3/s. Four boiling regimes are identified through visual observation. It appears that the boiling heat transfer in narrow channel possesses a better heat transfer rate. Based on the experimental result, the Chen correlation is modified by Bond number to be applicable to the area of narrow space boiling heat transfer.