Flow characteristics in hydraulically equilibrium two-phase flows in a vertical 2×3 rod bundle channel

Sadatomi, Michio; Kawahara, Akimaro; Kano, Keiko; Tanoue, Satoru

doi:10.1016/j.ijmultiphaseflow.2004.05.012

Cited by 33 publications

(20 citation statements)

References 32 publications

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“…This data trend agrees with the calculations by Carlucci et al's correlations (8) . However, the agreement is not quantitatively enough as reported by Sadatomi et al (5) Figure 5 shows total pressure drop data in each subchannel. The pressure drop is almost identical between Ch.1 and Ch.2 because the flow under consideration is a hydraulically equilibrium flow in which both the pressure difference and the net fluid transfer do not exist between the subchannels as a time averaged value.…”

Section: Methodsmentioning

confidence: 57%

“…1 Cross-section of the test channel with 2 × 3 rods of the entry section. The flow rates of water and air in each group were so controlled for the flow in the mixing section to become hydraulically equilibrium flow, as described in Sadatomi et al (5) In the mixing section, both phases could go through all the gaps between the subchannels. In the other three sections, however, they could not because of the insertion of 1.0 mm thick fins into the grooves on the duct and the rods walls, as shown in the left hand side of the figure.…”

Section: Methodsmentioning

confidence: 99%

“…The number of data points in each flow regime is 11 in bubble flows, 25 in slug and churn flows and 7 in annular flows. Figure 3 shows typical flow distribution data in a hydraulically equilibrium two-phase flow at j L = 1.0 m/s (5) . The ordinate is the ratio of flow rates in one subchannel to the whole channel.…”

Section: Methodsmentioning

confidence: 99%

“…Turbulent mixing rate between the subchannels (4) , flow distribution and flow character-istics (5) , prediction of the distribution in annular flow for hydraulically equilibrium flows (6) , and flow redistribution due to void drift for the non-equilibrium flows (7) had been studied. Following these, void fraction and pressure drop in each subchannel have been measured and analyzed in the present study in order to obtain more reliable prediction method for these parameters.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Void Fraction and Pressure Drop in Two-Phase Equilibrium Flows in a Vertical 2*3 Rod Bundle Channel-Assessment of Correlations against the Present Subchannel Data

Sadatomi

Kano

Kawahara

et al. 2006

JSME Int. J., Ser. B

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In order to increase void fraction and pressure drop data in a multi-subchannel system like an actual fuel rod bundle, air-water experiments have been conducted using a vertical 2 × 3 rod bundle channel made up of two central and four side subchannels as the test channel. Void fraction and pressure drop in each subchannel were measured and the frictional pressure drop was determined mainly for slug and churn flows. The results show that both the void fraction and the frictional pressure drop are higher in the central subchannel than the side one. In order to analyze the data, the data on gas and liquid flow rates in each subchannel under the same flow condition have been used. In the analysis, the calculations by various correlations reported in literatures have been compared with the present data for validation. The recommended correlations respectively for the void fraction and the frictional pressure drop have been clarified. Results of such experiments and analyses are presented and discussed in this paper.

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Section: Methodsmentioning

confidence: 57%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Void Fraction and Pressure Drop in Two-Phase Equilibrium Flows in a Vertical 2*3 Rod Bundle Channel-Assessment of Correlations against the Present Subchannel Data

Sadatomi

Kano

Kawahara

et al. 2006

JSME Int. J., Ser. B

View full text Add to dashboard Cite

show abstract

“…Pressure drop was measured with a differential-type pressure transducer within ± 2% by taking an appropriate interval between two pressure taps. Gas bubble velocity in bubbly and slug flows was measured within ± 2% with two pairs of ring electrodes in a constant current method developed by Fukano (8) and modified a little by Sadatomi et al (9) . The interval between the electrodes in each pair was 8 mm and that between two pairs was 75 mm, independent of the pipe diameter.…”

Section: Introductionmentioning

confidence: 99%

Effects of Surface Tension on Two-Phase Gas-Liquid Flows in Horizontal Small Diameter Pipes

Sadatomi

Kawahara

Matsuo

et al. 2010

JPES

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The purpose of the present study is to clarify both the surface tension and the pipe diameter effects on two-phase flows in horizontal small diameter pipes. In the experiments, four-kinds of test liquids with different fluid properties were used together with 3, 5 and 9 mm i.d. test pipes. The flow parameters studied were flow pattern, bubble size, liquid film thickness, void fraction and pressure drop, etc. The flow patterns covered were bubbly, slug, and annular flows. From the measured data, the data of interfacial friction force per unit volume, F i , was also obtained.By comparing data obtained in different pipe and test liquid combinations, the effects of the surface tension and the pipe diameter on the flow parameters have been clarified. In addition, new correlations of mean liquid film thickness and interfacial friction factor in annular flow have been derived with some dimensionless groups.

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Dynamic film thickness between bubbles and wall in a narrow channel

et al. 2011

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The present paper describes a novel technique to characterize the behavior of the liquid film between gas bubbles and the wall in a narrow channel. The method is based on the electrical conductance. Two liquid film sensors are installed on both opposite walls in a narrow rectangular channel. The liquid film thickness underneath the gas bubbles is recorded by the first sensor, while the void fraction information is obtained by measuring the conductance between the pair of opposite sensors. Both measurements are taken on a large two-dimensional domain and with a high speed. This makes it possible to obtain the two-dimensional distribution of the dynamic liquid film between the bubbles and the wall. In this study, this method was applied to an air-water flow ranging from bubbly to churn regimes in the narrow channel with a gap width of 1.5 mm.

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Flow characteristics in hydraulically equilibrium two-phase flows in a vertical 2×3 rod bundle channel

Cited by 33 publications

References 32 publications

Void Fraction and Pressure Drop in Two-Phase Equilibrium Flows in a Vertical 2*3 Rod Bundle Channel-Assessment of Correlations against the Present Subchannel Data

Void Fraction and Pressure Drop in Two-Phase Equilibrium Flows in a Vertical 2*3 Rod Bundle Channel-Assessment of Correlations against the Present Subchannel Data

Effects of Surface Tension on Two-Phase Gas-Liquid Flows in Horizontal Small Diameter Pipes

Dynamic film thickness between bubbles and wall in a narrow channel

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