Measurement and modeling of two-phase flow parameters in scaled 8×8 BWR rod bundle

Yang, Xiaohong; Schlegel, Joshua P.; Liu, Y.; Paranjape, Sidharth; Hibiki, Takashi; Ishii, Mamoru

doi:10.1016/j.ijheatfluidflow.2012.02.001

Cited by 49 publications

(14 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This IAC correlation has been verified by the adiabatic two-phase flow data of Yang et al (2012) taken in a vertical 8×8 rod bundle flow channel.…”

supporting

confidence: 58%

“…Following the way of Paranjape (2009), the obtained conversion coefficients of the subchannel center values and the rod gap center values are 0.662 and 0.243 respectively for core-peaking profiles and 0.479 and 0.430 respectively for wall-peaking profiles in the present experiments. The approach of Yang et al (2012) to determine the radial core-peaking or wall-peaking profile according to the comparison between the subchannel center value and the rod gap center value was adopted in the present experiments. In our obtaining the conversion coefficients for the wallpeaking profiles, the values at the rod gap center were chosen as the peak values of the profiles, which was not clearly explained in the thesis of Paranjape (2009).…”

Section: Cross-sectional Area-averaging For Local Double-sensor Probementioning

confidence: 99%

“…Since the cap bubbles (group 2 bubbles) start to form when the void fraction reaches about 5% in the bubbly flow (Shen et al, 2010bSun et al, 2014), the IAC correlation of considers the contributions of the two group bubbles and accordingly gives a better prediction for the IAC experimental data taken in the present 6×6 rod bundle flow channel. In view of the performance of Shen and Deng (2016) IAC correlation in reasonably predicting the IAC data taken in the present 6×6 rod bundle and the 8×8 rod bundle of Yang et al (2012), the IAC correlation should be applicable for the other cases of rod bundle flow channel and is accordingly recommended for the IAC prediction of the bubbly flows in rod bundle flow channel.…”

mentioning

confidence: 99%

See 2 more Smart Citations

Local measurements of upward air-water two-phase flows in a vertical 6×6 rod bundle

Shen

Miwa

Xiao

et al. 2019

Exp. Comput. Multiph. Flow

View full text Add to dashboard Cite

A 3 m high vertical rod bundle flow channel consisting of 6×6 rods with the rod diameter of 10 mm and the pitch of 16.7 mm and a channel box with the cross section of 100 mm × 100 mm was used to study the local two-phase flow characteristics under influences of the 36 rods and the channel box. The air and water were selected as the two-phase working fluids in the present experiments. A double-sensor probe installed at the axial position of z/DH = 149 and six evenly-installed differential pressure (DP) gauges measured the upward-moving two-phase flow in the rod bundle flow channel under the atmospheric condition. Since the local parameters of void fraction, interfacial area concentration (IAC), bubble diameter, and gas velocity are essential to know the internal structures of the two-phase flow, their data at 16 points within an octant symmetric triangular area of the flow channel cross section were collected by the double-sensor probe under various flow conditions in the experiments. The local measurements of double-sensor probe were found to agree well with the void fractions from the DP gauges and the superficial gas velocity from a gas flowmeter. Both the measured void fractions and IACs displayed a transition from radial wall-peaking profile to radial core-peaking profile in the low superficial liquid velocity flow conditions and pure radial wall-peaking profiles in the high superficial liquid velocity flow conditions. The measured Sauter mean diameters showed their radial wall-peaking profiles with the peaking degree decreasing with the increasing superficial gas velocity in both the low and high superficial liquid velocity flow conditions. The measured gas velocities in the main flow direction showed a transition from a radial nearly-flat profile or a radial mid-peaking profile to radial core-peaking profiles in the low and high superficial liquid velocity flow conditions. The area-averaged void fractions and IACs integrated from their measured local values were respectively compared with the predictions of existing drift-flux and IAC correlations. The comparison results showed that the drift-flux correlation of Ozaki et al. (2013) and the IAC correlation of Shen and Deng (2016) give the reasonable prediction and can be recommended for the predictions of the void fraction and the IAC respectively in the bubbly flows in the rod bundle flow channel. Keywords 6×6 rod bundle flow channel gas-liquid two-phase flow void fraction interfacial area concentration double-sensor probe

show abstract

“…This IAC correlation has been verified by the adiabatic two-phase flow data of Yang et al (2012) taken in a vertical 8×8 rod bundle flow channel.…”

supporting

confidence: 58%

Section: Cross-sectional Area-averaging For Local Double-sensor Probementioning

confidence: 99%

mentioning

confidence: 99%

See 1 more Smart Citation

Local measurements of upward air-water two-phase flows in a vertical 6×6 rod bundle

Shen

Miwa

Xiao

et al. 2019

Exp. Comput. Multiph. Flow

View full text Add to dashboard Cite

show abstract

“…28and 29, with the data taken in a vertical 8×8 rod bundle under the pressure of 7.2 MPa (Ozaki and Hibiki, 2015). Equations 28and 29have been validated by NUPEC BTBF data (Morooka et al, 1991), JAERI TPTF data (Kondo et al, 1993), and Purdue adiabatic data (Yang et al, 2012). The applicable range covers the pressure from 0.1 to 11.8 MPa, mass velocity from 5 to 2000 kg/(m 2 •s), hydraulic equivalent diameter from 9.8 to 21.7 mm, and casing size from 79 to 140 mm (Ozaki et al, 2013).…”

Section: Upward Two-phase Flow In a Vertical Sub-channel Of Rod Bundlmentioning

confidence: 93%

One-dimensional drift-flux correlations for two-phase flow in medium-size channels

Hibiki

2019

Exp. Comput. Multiph. Flow

View full text Add to dashboard Cite

The drift-flux parameters such as distribution parameter and drift velocity are critical parameters in the one-dimensional two-fluid model used in nuclear thermal-hydraulic system analysis codes. These parameters affect the drag force acting on the gas phase. The accurate prediction of the drift-flux parameters is indispensable to the accurate prediction of the void fraction. Because of this, the current paper conducted a state-of-the-art review on one-dimensional drift-flux correlations for various flow channel geometries and flow orientations. The essential conclusions were: (1) a channel geometry affected the distribution parameter, (2) a boundary condition (adiabatic or diabatic) affected the distribution parameter in a bubbly flow, (3) the drift velocity for a horizontal channel could be approximated to be zero, and (4) the distribution parameter developed for a circular channel was not a good approximation to calculate the distribution parameter for a sub-channel of the rod bundle. In addition to the above, the review covered a newly proposed concept of the two-group drift-flux model to provide the constitutive equation to close the modified gas mixture momentum equation of the two-fluid model mathematically. The review was also extended to the existing drift-flux correlations applicable to a full range of void fraction (Chexel-Lellouche correlation and Bhagwat-Ghajar correlation).

show abstract

“…Chen et al [1] utilized the impedance void meters to measure area-averaged void fraction at various axial locations in an 8×8 rod bundle. Local conductivity probes have also been used to measure the local void fraction [2]. Kok et al [3] developed a subchannel void-fraction measurement system based upon the gammatransmission technique and applied to a scaled model of a BWR fuel assembly.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Air–water Two-phase Flow in a 3×3 Rod Bundle for PDF Analysis

Ruan¹,

Yu²,

Chen³

et al. 2019

Proceedings of the 4th World Congress on Momentum, Heat and Mass Transfer

View full text Add to dashboard Cite

The objective of this study is to investigate the void fraction distributions by examining the Probability Distribution Function (PDF) of local void fraction in a 3x3 rod bundle geometry. A series of experiment has been carried out with air-water two-phase flow. The experimental tests were performed under the flow conditions of Jg = 0.076-0.24 m/s and Jf = 0.14, 0.19 and 0.24m/s. Two sets of conductivity probe arrangements were used to measure the local void fractions in the regions of "rod-gap" and "sub-channel". It was observed that while the superficial gas velocity increases, the peak regions of probability distribution function may become broadened; whereas the peak values of PDF may be shifted to the left as superficial liquid velocity increases. In addition, the PDF peak values of both regions tended to stay closer and become more overlapped with increasing superficial gas and liquid velocities.

show abstract

Measurement and modeling of two-phase flow parameters in scaled 8×8 BWR rod bundle

Cited by 49 publications

References 21 publications

Local measurements of upward air-water two-phase flows in a vertical 6×6 rod bundle

Local measurements of upward air-water two-phase flows in a vertical 6×6 rod bundle

One-dimensional drift-flux correlations for two-phase flow in medium-size channels

Experimental Study of Air–water Two-phase Flow in a 3×3 Rod Bundle for PDF Analysis

Contact Info

Product

Resources

About