Phase distribution characteristics of bubbly flow in 5 × 5 vertical rod bundles with mixing vane spacer grids

Ren, Qingwen; Pan, Liang‐ming; Zhou, Wen-xiong; Du, Shaowu; Li, Zhongchun

doi:10.1016/j.expthermflusci.2018.04.002

Cited by 39 publications

(12 citation statements)

References 34 publications

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“…Yun et al (2008) reported that bubbles gathered near the rod wall in sub-cooled boiling in 3 × 3 rod bundles; and the bubble layer and void fraction peak values were influenced by heat flux and mass flow rate. Ren et al (2018a) and Ren et al (2019) presented the detailed wall-peak void fraction profiles for bubbly flow and core-peak phase distribution for cap bubbly flow in 5 × 5 rod bundles. According to Arai et al (2012) and Lucas et al (2007), small bubbles were pushed to aggregate near the rod wall by lift force (Tomiyama, 1998;Tomiyama et al, 2002), while large bubbles were kept away from walls by wall lubrication force (Antal et al, 1991).…”

Section: Phase Distribution Characteristics In Rod Bundlesmentioning

confidence: 99%

“…Yang et al (2013) pointed out that the simplified spacer grids without mixing vanes produced stronger turbulence and made the large bubbles break up. Ren et al (2018a) demonstrated that, for the wall-peak void fraction profiles, mixing vane space grids (MVSGs) enhanced the wall-peak phenomenon by giving rise to the larger void fraction peak values near the rod wall at the downstream of the MVSG.…”

Section: Phase Distribution Characteristics In Rod Bundlesmentioning

confidence: 99%

“…In order to produce uniform small bubbles at the inlet of the test section, the air-water mixer was designed, which consisted of four porous metal tubes. Moreover, the phase distribution characteristics at the inlet (Port 0 shown in Figure 3) could be referred from Ren et al 2018a. More information about the experimental setup could be found in the authors' previous research (Ren et al, 2018a;Ren et al, 2018b;Ren et al, 2018c;Ren et al, 2018d;Ren et al, 2018e;Liu et al, 2018;Ren et al, 2019;Ye et al, 2019).…”

Section: Experimental Setup Test Loopmentioning

confidence: 99%

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Experimental Study on the Transition Characteristics and Criterion From Wall-Peak to Core-Peak Phase Distribution in Vertical Rod Bundles

Ren¹,

Pu²,

Pan

et al. 2021

Front. Energy Res.

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Aiming at understanding the phase distribution characteristics and developing the transition criterion from wall-peak to core-peak phase distribution in a rod bundle channel, air–water two-phase flow experiments were conducted in 5 × 5 rod bundles in the Interfacial Evolution Research Facility at Chongqing University (IERFC). Based on the experimental data, the influences of gas velocity, liquid velocity, mixing vane spacer grid (MVSG), and geometrical size on phase distribution have been analyzed in detail. With the increasing superficial gas velocity and decreasing liquid velocity, the wall-peak phase distribution turned to core-peak. The wall-peak phase distribution was enhanced by an MVSG, and the transition from the transitional phase distribution to the wall-peak phase distribution appeared when the air–water mixture flowed through the MVSG. The gap size was the key factor for the transition of phase distribution in rod bundles. Moreover, the transition criterion from wall-peak to core-peak phase distribution was developed based on present experimental data and the data in the literature, which was also verified based on the limited data. More experiments were recommended to focus on the detailed phase distribution in the rod bundle channel with different geometrical sizes.

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Section: Phase Distribution Characteristics In Rod Bundlesmentioning

confidence: 99%

Section: Phase Distribution Characteristics In Rod Bundlesmentioning

confidence: 99%

Section: Experimental Setup Test Loopmentioning

confidence: 99%

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Experimental Study on the Transition Characteristics and Criterion From Wall-Peak to Core-Peak Phase Distribution in Vertical Rod Bundles

Ren¹,

Pu²,

Pan

et al. 2021

Front. Energy Res.

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“…The void fraction data were collected for the evaluation and improvement of the drift-flux model correlations and pressure drop data were obtained for the assessment and development of two-phase friction multiplier model and two-phase spacer-grid-loss coefficient model in the rod bundle flow channel. Some studies (Yun et al, 2008;Yang et al, 2013;Hosokawa et al, 2014;Ren et al, 2018) have focused on the local measurements of radial void fraction, IAC, and two-phase velocity profiles in the rod bundle flow channel. The obtained radial profile data of the flow parameters were mainly used for the development for two-phase interfacial transfer model, which is required to close the two-fluid model (Ishii, 1975;Ishii and Hibiki, 2010), and the validation of numerical simulations in the rod bundle.…”

mentioning

confidence: 99%

“…However, the available radial profile database for the local flow parameters are not enough to thoroughly know the whole picture of the flow characteristics and correctly make the constitutive models required for accurate predictions using the two-fluid model in the rod bundle flow channel. The available databases from local measurements, moreover, only consist of the 3×3 rod bundle data of Yun et al (2008), the 4×4 rod bundle data of Hosokawa et al (2014), the 5×5 rod bundle data of Ren et al (2018), and the 8×8 rod bundle data of Yang et al (2013).…”

mentioning

confidence: 99%

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

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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

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Experimental study of gas-liquid flow patterns and void fraction in prototype 5 × 5 rod bundle channel using wire-mesh sensor

Liu

et al. 2022

Annals of Nuclear Energy

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Phase distribution characteristics of bubbly flow in 5 × 5 vertical rod bundles with mixing vane spacer grids

Cited by 39 publications

References 34 publications

Experimental Study on the Transition Characteristics and Criterion From Wall-Peak to Core-Peak Phase Distribution in Vertical Rod Bundles

Experimental Study on the Transition Characteristics and Criterion From Wall-Peak to Core-Peak Phase Distribution in Vertical Rod Bundles

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

Experimental study of gas-liquid flow patterns and void fraction in prototype 5 × 5 rod bundle channel using wire-mesh sensor

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Phase distribution characteristics of bubbly flow in 5 × 5 vertical rod bundles with mixing vane spacer grids

Cited by 39 publications

References 34 publications

Experimental Study on the Transition Characteristics and Criterion From Wall-Peak to Core-Peak Phase Distribution in Vertical Rod Bundles

Experimental Study on the Transition Characteristics and Criterion From Wall-Peak to Core-Peak Phase Distribution in Vertical Rod Bundles

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

Experimental study of gas-liquid flow patterns and void fraction in prototype 5 × 5 rod bundle channel using wire-mesh sensor

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Phase distribution characteristics of bubbly flow in 5 × 5 vertical rod bundles with mixing vane spacer grids