Numerical modelling of low-Reynolds number direct contact condensation in a suppression pool test facility

Patel, Giteshkumar; Tanskanen, Vesa; Kyrki-Rajamäki, Riitta

doi:10.1016/j.anucene.2014.04.009

Cited by 38 publications

(6 citation statements)

References 16 publications

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“…For the steam jet condensation, a lot of works have been developed for many years, like the condensation regime (Cho et al, 1998;Petrovic de With et al, 2007;Wu et al, 2009;Song and Kim, 2011), the steam jet pattern (Chun et al, 1996;Wu et al, 2009), the coefficient of heat transfer (Kim et al, 2001;Shah et al, 2010Shah et al, , 2013Patel et al, 2014) and the steam jet condensation load (Chan, 1978;Fukuda, 1982;Simpson and Chan, 1982). When steam is jetted into water and condensed by water, there will generate some pressure impulse in water pool, which is called condensation oscillation.…”

Section: Introductionmentioning

confidence: 98%

Pressure oscillation and steam cavity during the condensation of a submerged steam jet

Zhao

Chen

Yuan

et al. 2015

Annals of Nuclear Energy

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a b s t r a c tSteam jet condensation is important in many industrial applications. In this work, the pressure oscillation and steam jet patterns during submerged jet condensation in quiescent water is investigated experimentally. Firstly, it is found that even at stable condensation region, the steam cavity length varies all the time and steam bubbles separate from the steam cavity periodically. With the variation of steam cavity length and separated bubble oscillation, condensation also undergoes oscillation. Along the axial direction, the pressure oscillation intensity increases first and then decreases gradually. There is an distinct pressure oscillation peak, and the peak position varies over a length-to-diameter ratio range of X/D = 2 to X/D = 7. The axial position of pressure oscillation peak corresponds to the end of steam cavity. Moreover, oscillation energy analysis shows that the oscillation energy generated by separated steam bubble is much higher than that generated by the steam cavity length variation. Finally, based on the relationship between the axial distribution of pressure oscillation and the steam cavity, a method is proposed to determine the maximum steam cavity length by measuring the pressure oscillation distributions. The predicted deviation is only in range of ±16% for the test conditions.

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Section: Introductionmentioning

confidence: 98%

Pressure oscillation and steam cavity during the condensation of a submerged steam jet

Zhao

Chen

Yuan

et al. 2015

Annals of Nuclear Energy

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“…For very low steam mass flows, condensation is predicted to occur entirely within the vent pipe, where unstable circumstances characterised by cyclic oscillations (i.e., oscillation condensation) and rapid bubble collapse are usual. Several pool layouts have been studied: rectangular [17,18,21,22], the cylindrical pools of the PANDA [23], POOLEX [7,[24][25][26], and PUMA [27] facilities, toroidal [4,28], and trapezoidal [11]. Downward injection blowdown pipes [3,17,18,28,29], horizontal injection [11,30], vertical upward injection [31], and multi-hole spargers [3,4] are among the vent pipe configurations that have been studied.…”

Section: Literature Review and Objectivementioning

confidence: 99%

CFD Study of Thermal Stratification in a Scaled-Down, Toroidal Suppression Pool of Fukushima Daiichi Type BWR

Kota

Ali

Jayanti

2023

Fluids

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During the 2011 nuclear catastrophe at Fukushima Daiichi, Unit 3 had a sharper increase in containment pressure than Unit 2, with thermal stratification of the suppression pool cited as one of the contributing factors. In the present work, the buoyancy-induced circulation consequent to steam condensation in a large, toroidal pool of water is studied using computational fluid dynamics (CFD) simulations with a view to understanding the role of important design parameters of the suppression pool system. The tunnelling phenomenon observed in the development of the thermal stratification process is delineated in terms of the establishment of a thermocline. The effects of the number of steam injection points and the cross-section of the pool on thermal stratification characteristics have been investigated through a number of case studies. In all the cases, the surface temperature, which is responsible for over-pressurization of the containment, is found to be significantly higher than the bulk pool temperature. Multiple injection points with the same overall steam flow rate are found to lead to higher surface temperatures due to a shortened circulation path. For the same volume of pool water, the simulations show that a deeper and narrower pool gives rise to significantly higher temperatures than a wider and shallower pool. This is attributed to the relatively deeper penetration of the buoyancy-induced circulation into the pool.

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“…In fact, many CFD methods trying to resolve a phase change involved flow can only be applicable to its very unique situation. Patel et al (2014) http://dx.doi.org/10.1016/j.nucengdes.2015.11.011 0029-5493/© 2015 Elsevier B.V. All rights reserved. investigated the DCC of low-Reynolds number steam blowdown flow in suppression pool using OPENFOAM and NEPTUNE CFD CFD codes, with zero resistance assigned at the gas side, while at the liquid side, condensation models based on surface renewal and surface divergence theories were applied.…”

Section: Introductionmentioning

confidence: 97%

CFD simulation of steam–air jet condensation

Sui²,

Tian

2016

Nuclear Engineering and Design

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Numerical modelling of low-Reynolds number direct contact condensation in a suppression pool test facility

Cited by 38 publications

References 16 publications

Pressure oscillation and steam cavity during the condensation of a submerged steam jet

Pressure oscillation and steam cavity during the condensation of a submerged steam jet

CFD Study of Thermal Stratification in a Scaled-Down, Toroidal Suppression Pool of Fukushima Daiichi Type BWR

CFD simulation of steam–air jet condensation

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