Condensation experiments for counter-current flow limitation in an inverted U-tube

Kusunoki, Takayoshi; Nozue, Takahiro; Hayashi, Kosuke; Hosokawa, Shigeo; Tomiyama, Akio; Murase, Michio

doi:10.1080/00223131.2015.1057253

Cited by 15 publications

(4 citation statements)

References 10 publications

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“…( 11), β = 0 for flooding at the bottom end, i.e. CCFL-L (Kusunoki et al, 2016), and β = about 0.5 for flooding inside vertical pipes, i.e. CCFL-P (Yamamoto et al, 2016).…”

Section: Ccfl Characteristicsmentioning

confidence: 99%

Flow characteristics in vertical circular pipes with the square top end under flooding conditions

Takaki

Goda

Hayashi

et al. 2021

Nuclear Engineering and Design

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“…( 11), β = 0 for flooding at the bottom end, i.e. CCFL-L (Kusunoki et al, 2016), and β = about 0.5 for flooding inside vertical pipes, i.e. CCFL-P (Yamamoto et al, 2016).…”

Section: Ccfl Characteristicsmentioning

confidence: 99%

Flow characteristics in vertical circular pipes with the square top end under flooding conditions

Takaki

Goda

Hayashi

et al. 2021

Nuclear Engineering and Design

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“…Korean researchers determined the local HTC during condensation with presence and absence of noncondensable gases [7]. Japanese authors investigated counterflow of steam and condensate in U-shaped tubes [8]. Also, in Russia experiments about condensation inside large diameter tubes were provided [9].…”

Section: Introductionmentioning

confidence: 99%

Study of condensation at the surfaces of tube with gradient heat flux measurement

et al. 2018

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Gradient heat flux measurement is used for study of heat transfer during condensation of water steam at inner and outer surfaces of tube. Experimental setups allow producing experiments with minimal distortion of condensate film flow. Experiments were carried out for different directions of steam and cooling water flows and for different angles of tube inclination relative to the vertical. Heat transfer coefficients and their change along the length and perimeter of tube were measured. The obtained data allow to study formation of condensate film and parameters of film motion. The results are corresponding to classical ideas.

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“…For example, CCFL may take place in the steam generator of a pressurized water reactor (PWR) during a reflux-cooling mode, and therefore, CCFL correlations are required to evaluate the flow rate of liquid flowing into the reactor core. Hence we have been investigating the CCFL characteristics in vertical pipes (Kusunoki et al, 2015(Kusunoki et al, , 2016Murase et al, 2016) and proposed some CCFL correlations (Kusunoki et al, 2015), which account for the effects of the fluid properties on the CCFL characteristics. The correlations were however obtained by a purely empirical manner.…”

Section: Introductionmentioning

confidence: 99%

Semi-empirical correlation for counter-current flow limitation at the upper or lower end of sharp-edged vertical pipes

Goda

Hayashi

Kirkland

et al. 2018

Nuclear Engineering and Design

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A semi-empirical correlation for CCFL (counter-current flow limitation) in vertical pipes was derived from one-dimensional momentum equations. Available correlations such as the empirical correlations proposed by Wallis (1969) and Zapke and Kröger (1996) can be deduced from the derived fundamental functional form of the semi-empirical correlation in limiting flow conditions. Comparisons between the semi-empirical correlation with available experimental data of CCFL taking place at the sharp-edged lower end of a vertical pipe showed that the correlation is applicable for various fluid properties and pipe diameters. The fundamental functional form of the correlation was also transformed so as to express the characteristics of CCFL occurring at the sharp-edged upper end of a vertical pipe. The present fundamental functional form of CCFL correlation is useful not only to express CCFL data but also to understand how relevant parameters play their roles in the CCFL characteristics.

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Condensation experiments for counter-current flow limitation in an inverted U-tube

Cited by 15 publications

References 10 publications

Flow characteristics in vertical circular pipes with the square top end under flooding conditions

Flow characteristics in vertical circular pipes with the square top end under flooding conditions

Study of condensation at the surfaces of tube with gradient heat flux measurement

Semi-empirical correlation for counter-current flow limitation at the upper or lower end of sharp-edged vertical pipes

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