CATHARE phase separation modeling for small breaks in horizontal pipes with stratified flow

Maciaszek, T.; Micaelli, Jean-Claude

doi:10.1016/0029-5493(90)90295-9

Cited by 35 publications

(2 citation statements)

References 3 publications

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“…Masiaszek et al 4) (CENG, France) performed the steamwater experiment at the maximum pressure of 2.0 MPa. Their correlation for onset of liquid entrainment was developed using C 2 as 1.5 instead 2.5 considering the effect of branch diameter.…”

Section: Previous Studies: Break Flow Of Sb-locamentioning

confidence: 99%

Off-take and Slug Transition at T-junction of Vertical-up Branch in the Horizontal Pipe

Moon

2003

Journal of Nuclear Science and Technology

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The off-take and the slug transition on air-water interface are experimentally investigated at the T-junction of the horizontal pipe with a vertical upward branch to simulate the loss-of-residual-heat-removal during a mid-loop operation in the Korea standard nuclear power plant. Scaling analysis is performed to scale down the experimental facility to the reference nuclear power plant. Two different diameters of branch pipes are used to verify the scaling laws and their scale effects. Air is used as working gaseous fluid and no water flow exists. Off-take behavior on horizontal stratified and slug flows is visually observed in the horizontal pipe. The experimental data are divided into three categories; onset of liquid entrainment at T-junction, onset of slug transition in the horizontal pipe, and discharge quality in the branch pipe. It is found out that the scale effect of the branch diameter on the onset of liquid entrainment is small and the existing correlations for it are applicable. Also, the onset of slug transition shows a discrepancy with Taitel-Dukler's correlation and has a strong influence on the discharge quality. New correlations for discharge quality are developed considering the critical dependency of the onset of slugging.

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Section: Previous Studies: Break Flow Of Sb-locamentioning

confidence: 99%

Off-take and Slug Transition at T-junction of Vertical-up Branch in the Horizontal Pipe

Moon

2003

Journal of Nuclear Science and Technology

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“…Besides, the air chamber height h b of onset point rises with the increase in gas phase Froude number. Many other scholars have built some mathematical models that have been successfully applied for various analysis programs (e.g., RELAP5 Ransom et al, 2001 andCATHARE Maciaszek andMicaelli, 1990). However, Bartley et al (2008) studied the entrainment process of the inclined branch pipe on the flat wall surface; he found that the onset point of the liquid phase entrainment was independent of the inclination angle.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Different Branch Angles and Different Branch Pipe Sizes on the Onset Law of Liquid Entrainment

Shen

Liu

et al. 2020

Front. Energy Res.

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The T-junction has been extensively employed in nuclear power plant systems. To ensure the normal operation of nuclear power plant, the onset point of T-junction liquid entrainment requires in-depth studies. Existing studies have been conducted on the onset point of liquid entrainment, whereas most of them are for small branch pipes. This study primarily discussed the onset law of large branch pipe. Moreover, the effects of branch angle and size on the onset point of liquid entrainment were analyzed by comparing it with other branch pipe sizes in this study. This study demonstrated that the effect of branch angle on the onset point of entrainment complies with that of other sizes, i.e., because that the decrease in the inertial force in the vertical direction acting on the liquid phase by the gas phase with the decrease in the angle, hence, the onset requires larger Fr g under the identical h b with the decrease in the angle between the branch pipe and the horizontal direction. Moreover, by comparing the onset point law of liquid entrainment exhibiting different branch pipe sizes, the effect of branch pipe size on the onset was reported in this study that the smaller branch pipe requires the greater gas velocity in the presence of onset. We found that there is different flow resistance of different sizes of branch pipe, small branch has larger flow resistance, in order to remedy the flow resistance, the gas dynamic head decreases, thereby causing the Bernoulli effect weaker; the onset of liquid entrainment requires larger V 3g .

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Experimental research of liquid entrainment through ADS-4 in AP1000

Meng

Dong

Wang

et al. 2014

Annals of Nuclear Energy

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CATHARE phase separation modeling for small breaks in horizontal pipes with stratified flow

Cited by 35 publications

References 3 publications

Off-take and Slug Transition at T-junction of Vertical-up Branch in the Horizontal Pipe

Off-take and Slug Transition at T-junction of Vertical-up Branch in the Horizontal Pipe

The Effect of Different Branch Angles and Different Branch Pipe Sizes on the Onset Law of Liquid Entrainment

Experimental research of liquid entrainment through ADS-4 in AP1000

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