E113 Numerical Simulation of Countercurrent Flow in a PWR Hot Leg Using VOF Method

Murase, Michio; Kinoshita, Ikuo; Yanagi, Chihiro; Utanohara, Yoichi; Takata, Takashi; Yamaguchi, Akira; Tomiyama, Akio

doi:10.1299/jsmepes.2011.16.107

Cited by 2 publications

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“…On the other hand, the VOF method could well reproduce the effects of fluid properties on CCFL characteristics in a rectangular channel [15], but could not well simulate CCFL characteristics in a circular channel. Therefore, the computational grid and schemes were improved in the VOF method [16], and the calculated CCFL characteristics agreed well with the UPTF data [4] at 1.5 MPa.…”

Section: Introductionmentioning

confidence: 54%

“…The computational grid and schemes we used were the same as those in our previous study [16]. Figure 3 shows the computational grid for a PWR hot leg, which was based on the 1/15-scale air-water tests [9].…”

Section: Simulation Methodsmentioning

confidence: 99%

“…Gas was supplied from the side wall into the lower tank and flowed into the upper tank through the hot leg. In the computational grid, the gas inlet area was enlarged to decrease the gas inlet velocity, which was the most effective improvement in the VOF calculations [16]. Water was supplied from the bottom of the upper tank.…”

Section: Simulation Methodsmentioning

confidence: 99%

“…In order to investigate effects of the shape and size of the flow channels simulating a PWR hot leg and the fluid properties on CCFL characteristics, we have done numerical simulations [13][14][15][16] using a two-fluid model and a volume of fluid (VOF) method implemented in the CFD software, FLUENT6.3.26. We found that the two-fluid model could reproduce CCFL characteristics under low pressure conditions and we confirmed that those in the hot leg could be well correlated with the Wallis parameters [13,14].…”

Section: Introductionmentioning

confidence: 99%

“…In this paper, in order to investigate the effects of system pressure and fluid properties on CCFL characteristics in a PWR hot leg, we did sensitivity analyses using the VOF method used in the previous study [16] for system pressures up to 8 MPa under PWR full-scale conditions with the diameter of 750 mm. Using the CCFLs calculated in this study and values measured under air-water and steam-water conditions, we derived a CCFL correlation and its uncertainty.…”

Section: Introductionmentioning

confidence: 99%

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Correlation for countercurrent flow limitation in a PWR hot leg

Murase¹,

Tomiyama

Lucas

et al. 2012

Journal of Nuclear Science and Technology

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Numerical simulations were done to evaluate countercurrent flow limitation (CCFL) characteristics in a pressurized water reactor (PWR) hot leg with the diameter of 750 mm by using a volume of fluid (VOF) method implemented in the CFD software, FLUENT6.3.26. The calculated CCFL characteristics agreed well with known values including the UPTF data at 1.5 MPa. Sensitivity analyses for system pressures up to 8 MPa showed that the calculated CCFL characteristics in the Wallis diagram were slightly mitigated from 0.1 MPa to 1.5 MPa with increasing system pressure, but they did not change from 1.5 MPa to 8 MPa. Using the CCFLs calculated in this study and values measured under air-water and steam-water conditions, a CCFL correlation and its uncertainty were derived.

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Section: Introductionmentioning

confidence: 54%

Section: Simulation Methodsmentioning

confidence: 99%

Section: Simulation Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Correlation for countercurrent flow limitation in a PWR hot leg

Murase¹,

Tomiyama

Lucas

et al. 2012

Journal of Nuclear Science and Technology

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VOF Calculations of Countercurrent Gas-Liquid Flow in a PWR Hot Leg

Murase¹,

Tomiyama

Kinoshita

et al. 2012

Science and Technology of Nuclear Installations

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We improved the computational grid and schemes in the VOF (volume of fluid) method with the standard k − ε turbulent model in our previous study to evaluate CCFL (countercurrent flow limitation) characteristics in a full-scale PWR hot leg (750 mm diameter), and the calculated CCFL characteristics agreed well with the UPTF data at 1.5 MPa. In this paper, therefore, to evaluate applicability of the VOF method to different fluid properties and a different scale, we did numerical simulations for full-scale airwater conditions and the 1/15-scale air-water tests (50 mm diameter), respectively. The results calculated for full-scale conditions agreed well with CCFL data and showed that CCFL characteristics in the Wallis diagram were mitigated under 1.5 MPa steam-water conditions comparing with air-water flows. However, the results calculated for the 1/15-scale air-water tests greatly underestimated the falling water flow rates in calculations with the standard k − ε turbulent model, but agreed well with the CCFL data in calculations with a laminar flow model. This indicated that suitable calculation models and conditions should be selected to get good agreement with data for each scale.

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E113 Numerical Simulation of Countercurrent Flow in a PWR Hot Leg Using VOF Method

Cited by 2 publications

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Correlation for countercurrent flow limitation in a PWR hot leg

Correlation for countercurrent flow limitation in a PWR hot leg

VOF Calculations of Countercurrent Gas-Liquid Flow in a PWR Hot Leg

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