Experimental and numerical investigations on the direct contact condensation phenomenon in horizontal flow channels and its implications in nuclear safety

Ceuca, Sabin Cristian; Laurinavicius, Darius

doi:10.3139/124.110729

Cited by 17 publications

(3 citation statements)

References 11 publications

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“…The Eqs. ( 3)-( 6),( 9)- (10) are still not closed equations and the unknown variables in them need to be determined by supplementary equations.…”

Section: Basic Control Equationsmentioning

confidence: 99%

“…For the prediction of condensation-induced water hammer pressure waves, several research institutions and scholars have developed computational models specifically for CIWH, and representative ones include the WAHA3 numerical computational program developed by Barna [8] and Tiselj [9] based on the WAHALoads project, as well as the computational program ATHLET [10]. The above models use a one-dimensional, twofluid, six-equation model, and a surge capture algorithm for pressure wave prediction of CIWH.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Inlet Conditions on the Two-Phase Flow Water Hammer Transients in Elastic Tube

Zhao

Duan

Xue

et al. 2023

Springer Proceedings in Physics

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Two-phase flow water hammer events occur in the pipelines of the nuclear power systems and lead to transient and violent pressure shock to tube structures. For the sake of operation safety, the occurrence and severity of the two-phase water hammer should be carefully assessed. This paper presents a parameter analysis of the inlet conditions on the two-phase flow water hammer transients, with considering the elastic effect of the tube walls. A numerical model is established for the vapor-liquid two-phase flow based on the two-fluid six-equation modelling approach, with incorporating correlations and criterions for two-phase flow regime, interfacial interactions and heat transfer. The governing equations are transformed to matrix form expressed by characteristic variables, and solved using the splitting operator method and the total variation diminishing scheme. The accuracy of the model is verified against the experimental data in open literature. Then, the model is applied to investigate the effect of inlet velocity and inlet water temperature on the two-phase flow water hammer transients. The simulation results show that the increase of inlet velocity increases the pressure peak values and brings forward the onset of water hammer, and the increase of inlet temperature decreases the pressure shock. A comparison of the water hammer results between the elastic tube and rigid tube is further presented, and the effect of the elastic modulus on the water hammer is analyzed. The results also show that the pressure peak is largely affected by the tube diameter.

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“…The Eqs. ( 3)-( 6),( 9)- (10) are still not closed equations and the unknown variables in them need to be determined by supplementary equations.…”

Section: Basic Control Equationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of Inlet Conditions on the Two-Phase Flow Water Hammer Transients in Elastic Tube

Zhao

Duan

Xue

et al. 2023

Springer Proceedings in Physics

View full text Add to dashboard Cite

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“…The similar result was also obtained by Li et al (2017) in a tee junction. Based on a stratified co-current two-phase flow, Ceuca and Laurinavicius (2016) found that even for phase inlet velocities corresponding to a laminar flow the liquid flow becomes turbulent because of an eddy-like structure.…”

Section: Introductionmentioning

confidence: 99%

Effects of Direct Contact Condensation on Flow Characteristics of Natural Circulation System at Low Pressure

Sun

Zhang

et al. 2020

Front. Energy Res.

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Direct contact condensation (DCC) as a complex thermal-hydraulic phenomenon has been the subject of a great deal of research under forced flow conditions. It is an interesting challenge to study the phenomenon in a natural circulation system (NCS). In this paper, the flow behaviors along with DCC phenomena were experimentally investigated by a visualization method in an NCS at low pressure. Moreover, the influence of initial parameters including heat flux, inlet temperature and resistance of the heated section on the NCS was analyzed in detail. The experimental results revealed that two types of DCC phenomena were found in the NCS. When Type I DCC occurs, the interface wave will be formed due to the hydraulic jump caused by the reverse flow of subcooled water. The interface wave easily contributes to the occurrence of Type II DCC due to the Kelvin-Helmholtz instability. In addition, the NCS tends to be more unstable with the increase in the heat flux or the inlet resistance. The influence of inlet temperature on the flow rate should comprehensively consider the changes of outlet parameters and subcooled degree of the steam and the subcooled water.

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Direct Contact Condensation of Steam in Subcooled Water

Datta

Chakravarty

Ghosh

et al. 2018

Energy, Environment, and Sustainability

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Experimental and numerical investigations on the direct contact condensation phenomenon in horizontal flow channels and its implications in nuclear safety

Cited by 17 publications

References 11 publications

Effects of Inlet Conditions on the Two-Phase Flow Water Hammer Transients in Elastic Tube

Effects of Inlet Conditions on the Two-Phase Flow Water Hammer Transients in Elastic Tube

Effects of Direct Contact Condensation on Flow Characteristics of Natural Circulation System at Low Pressure

Direct Contact Condensation of Steam in Subcooled Water

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