Experimental study of critical heat flux enhancement with hypervapotron structure under natural circulation conditions

Hou, Fangxin; Chang, Ho; Zhao, Yirong; Zhang, Ming; Gao, Tianfang; Chen, Peipei

doi:10.1016/j.nucengdes.2017.03.013

Cited by 5 publications

(6 citation statements)

References 18 publications

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“…Hou, et. al., [10] arranged a rectangular heat transfer enhancement structure on the surface of the wall for the experimental device.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation Of Heat Transfers Synergistic Performance Of He/S-CO2 Mixture Gas With The Heat Transfer Enhancement Structure On The First Wall Of Fusion Reactor

Wang²,

Zhou

et al. 2022

Preprint

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As a new cooling medium, Helium/ Supercritical Carbon Dioxide (He / S-CO2) binary mixture gas can effectively improve the heat transfer capability. In this paper, the heat transfers synergistic performance of He / S-CO2 with fins structure were numerically simulated by ANSYS / CFD method. The results show that the pressure drop in the channel decreases gradually with the increase of volume fraction of S-CO2. Comparing with smooth channel, fin structure can significantly improve the intensity of convective heat transfer intensity, the average Nusselt number of flow channel with finger fins are increased by 80%. The heat transfer efficiency of He/S-CO2 binary mixture gas coupled with heat transfer enhancement structure (triangular fins) is increased by 310% at the condition of volume ratio of S-CO2 to He with 2:1. Further study on the optimized scheme of first wall (FW) of International Thermonuclear Experimental Reactor (ITER) China Helium-Cooled Ceramic Breeder-Test Blanket Module (HCCB-TBM) show that triangular fins are placed on the inner surface of FW faced deuterium-tritium plasma, and the optimized distance between fin pitches is 7 ~ 10mm. The results can provide meaningful references for the cooling scheme design of the FW in ITER.

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“…Hou, et. al., [10] arranged a rectangular heat transfer enhancement structure on the surface of the wall for the experimental device.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation Of Heat Transfers Synergistic Performance Of He/S-CO2 Mixture Gas With The Heat Transfer Enhancement Structure On The First Wall Of Fusion Reactor

Wang²,

Zhou

et al. 2022

Preprint

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“…Various methods have been proposed for enhancing ERVC performance, including using structured surface, nanofluids (Pham et al, 2012;Angayarkanni and Philip, 2015) and thermal insulation (Yang et al, 2005;Noh and Suh, 2013). The structured surfaces include porous coating (Yang et al, 2006;Jun et al, 2016;Tetreault-Friend et al, 2016;Sohag et al, 2017;Wang et al, 2018), pin fins (Chu et al, 2013;Zhong et al, 2015), micro channels (Bai et al, 2016;Hou et al, 2017;Zhong et al, 2018aZhong et al, , 2018b, honeycomb porous plates (Mt Aznam et al, 2016;Fogaça et al, 2018), and spherical porous bodies (Mori et al, 2018), and so on. Yang et al (2006) fabricated a downward facing hemispherical surface with micro-porous coatings by sintering, while Sohag et al (2017) developed a Cold Spray technique to coat the same scale surface, both the coating surfaces were tested in the SBLB (Sub-scaled Boundary Layer Boiling) facility to investigate the CHF.…”

Section: Introductionmentioning

confidence: 99%

“…Nanoporous hydrophilic surface (Tetreault-Friend et al, 2016) and micro nano bi-porous copper surface (Wang et al, 2018) could also enhance the CHF and boiling heat transfer coefficient significantly, while the reliability is a huge challenge for ERVC. Therefore, the pin fin surfaces (Chu et al, 2013;Zhong et al, 2015) and micro channels surfaces (Bai et al, 2016;Hou et al, 2017;Zhong et al, 2018aZhong et al, , 2018b were developed to improve the performance of ERVC. Hou et al (2017) investigated the CHF of a hypervapotron structure surface under natural circulation conditions in TESEC facility.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, the pin fin surfaces (Chu et al, 2013;Zhong et al, 2015) and micro channels surfaces (Bai et al, 2016;Hou et al, 2017;Zhong et al, 2018aZhong et al, , 2018b were developed to improve the performance of ERVC. Hou et al (2017) investigated the CHF of a hypervapotron structure surface under natural circulation conditions in TESEC facility. The minimum CHF of the hypervapotron structure surface is 0.61 MW/m 2 at inclination angle of 10° while the maximum CHF is 2.15 MW/m 2 at inclination angle of 70°; compared with the smooth surface, more than 80% CHF increase at 20°-30° inclination angle and approximate 120% CHF increase at higher inclination angles were obtained.…”

Section: Introductionmentioning

confidence: 99%

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Effect of grooves on nucleate boiling heat transfer from downward facing hemispherical surface

Zhong

Sun

Jiang

et al. 2019

Exp. Comput. Multiph. Flow

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The external reactor vessel cooling (ERVC) is the key method to ensuring the success of in-vessel retention (IVR), which is one strategy of the Generation III+ advanced light water nuclear reactor to address severe accidents. The heat removal ability of ERVC is limited by the critical heat flux (CHF) on the outer surface of the lower head. In this paper, a heating system with the liquid metal as the intermediate heat medium in the scaled vessel was used to investigate the boiling heat transfer. A three-dimensional (3D) hemispherical grooved surface on scaled vessel was proposed and its steady boiling performance was investigated in saturated water. Consequently, the liquid metal temperature exceeded 430 °C when the heating power was 185 kW and the boiling crisis occurred, and the CHF increased from 967.4 to 2030.2 kW/m 2 when the orientation increased from 5° to 85°. Compared with the 3D plain surface, the CHF enhancement was higher than 102%. The CHF enhancement could attribute to the increase of heat transfer area and the improvement of the wettability. If the grooves on the reactor vessel could be manufactured by 3D printing in the future, the grooved surface will be a promising structure for ERVC.

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“…Various methods have been proposed for enhancing IVR performance and reliability, including using nanofluids [2][3][4][5] or surfactant solutions [6][7][8] instead of water and modifying the RPV outer wall [9][10][11][12][13][14]. Mori et al [15] proposed a combination of two approaches, the adoption of TiO 2 nanofluid as coolant and the attachment of a honeycomb porous plate (HPP) to the RPV outer wall to improve the critical heat flux (CHF).…”

Section: Introductionmentioning

confidence: 99%

Effect of honeycomb porous plate on critical heat flux in saturated pool boiling of artificial seawater

Fogaça

Mori

Imanishi

et al. 2018

International Journal of Heat and Mass Transfer

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During a severe nuclear power plant accident, the integrity of the reactor pressure vessel must be assured. In response to a possible fuel meltdown, operators of the current generation of nuclear power plants are likely to inject water into the reactor pressure vessel to cool down the reactor vessel wall, preserving its integrity and avoiding leakage of radioactive material. This study considers the use of seawater to flood a reactor pressure vessel combined with the attachment of a honeycomb porous plate (HPP) on the vessel outer wall as a way to improve the safety margins for in-vessel retention of fuel. In long-duration experiments, saturated pool boiling of artificial seawater was performed with an upward-facing plain copper heated surface 30 mm in diameter. The resulting value for critical heat flux (CHF) was 1.6 MW/m 2 at atmospheric pressure, a value significantly higher than the CHF obtained when the working fluid was distilled water (1.0 MW/m 2). It was verified that sea-salt deposits could greatly improve surface wettability and capillarity, enhancing the CHF. The combination of artificial seawater and an HPP attached to the heated surface improved the boiling heat transfer coefficient and increased the CHF up to 110% (2.1 MW/m 2) as compared to distilled water on a bare surface. After the artificial seawater experiments, most of the wall micropores of the HPP were clogged because of sea-salt aggregation on the HPP top and bottom surfaces. Thus, the CHF enhancement observed in this case was attributed mainly to the separation of liquid and vapor phases provided by the HPP channel structure and improvement of surface wettability and capillarity by sea-salt deposition.

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Experimental study of critical heat flux enhancement with hypervapotron structure under natural circulation conditions

Cited by 5 publications

References 18 publications

Numerical Simulation Of Heat Transfers Synergistic Performance Of He/S-CO2 Mixture Gas With The Heat Transfer Enhancement Structure On The First Wall Of Fusion Reactor

Numerical Simulation Of Heat Transfers Synergistic Performance Of He/S-CO2 Mixture Gas With The Heat Transfer Enhancement Structure On The First Wall Of Fusion Reactor

Effect of grooves on nucleate boiling heat transfer from downward facing hemispherical surface

Effect of honeycomb porous plate on critical heat flux in saturated pool boiling of artificial seawater

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