Two-phase CFD simulation of research reactor siphon breakers: A verification, validation and applicability study

Matozinhos, Camila Freitas; Santos, Andre Augustos Campagnole dos

doi:10.1016/j.nucengdes.2017.10.022

Cited by 6 publications

(7 citation statements)

References 10 publications

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“…According to the size of the siphon break line, the undershooting height was measured and the pressure and surface velocity of the main pipe were analyzed according to the water level of the pool. Results showed good agreement with experimental results with a reasonable uncertainty range [7][8][9][10]. Through a sensitivity analysis, Jin proposed a mathematical model of flood risk across an inverted siphon in a long-distance water transfer project [11].…”

Section: Introductionsupporting

confidence: 57%

“…The relative error of the positive slope and the reverse slope pipeline are controlled within 15%, and the error distribution is relatively uniform. It is shown that the calculation of the resistance coefficient in the siphon pipe at different slopes is suitable for Formulas (9) and (10). Since the formula deduced in this paper is an empirical formula, there are some errors between the test result and the calculated value of the formula.…”

Section: Verification and Error Analysis Of Resistance Coefficient Fomentioning

confidence: 97%

“…In the above formula, e refers to the relative error value; λm T refers to the resistance coefficient in the test; λm C refers to the resistance coefficient calculated by Formulas (9) and (10).…”

Section: Verification and Error Analysis Of Resistance Coefficient Fomentioning

confidence: 99%

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Impact Analysis of Slope on the Head Loss of Gas-Liquid Two-Phase Flow in Siphon Pipe

Zhang

Jin

et al. 2019

Water

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Through an analysis of the head loss of the gas–liquid two-phase flow in a siphon pipe, this paper measures the bubble velocity, pressure drop, and gas fraction under various conditions. The influence of varied head, gradient, and installation heights of the pipe on the air mass movement, head loss, and resistance coefficient of the gas–liquid two-phrase flow is analyzed on the basis of the test results. The results show that the bubble velocity reaches its minimum on the flat slope, and the velocity on the positive slope is higher than that on the reverse slope. The head loss of pipelines in both the positive slope and reverse slope increases as the gradient increases, while the head loss on the reverse slope is larger than that on the positive slope under the same gradient. When the gas fraction α is between 8% and 30%, the resistance coefficient λm is related to the gradient, gas fraction, and the Reynolds number Re. Furthermore, λm is proportionate to α and inversely proportionate to i of the bottom slope and the Re number. The calculation formula of the resistance coefficient λm under various gradients within the scope of the above gas fraction is derived on the basis of the test data, while the relative error is controlled within the allowable range.

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Section: Introductionsupporting

confidence: 57%

Section: Verification and Error Analysis Of Resistance Coefficient Fomentioning

confidence: 97%

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Impact Analysis of Slope on the Head Loss of Gas-Liquid Two-Phase Flow in Siphon Pipe

Zhang

Jin

et al. 2019

Water

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“…The mass flow rate of the liquid ̇ is replaced as in equation 5. After implementing same approximations as in equations (6) -(9), equation 4can be rewritten as in equation (18).…”

Section: Equations Governing the Flowmentioning

confidence: 99%

“…In addition to this, two-phase flow is simulated with the introduction of computational fluid dynamics which could be discussed and placed under previously named method, mechanistic [17][18][19][20][21][22][23]. It is also addressed in Lahey Jr.'s work [24] that straight resolving of the liquid film is excessively luxurious as it gets fragile close to the dryout site.…”

Section: Introductionmentioning

confidence: 99%

Theoretical Post-Dryout Heat Transfer Model

Tunç¹,

Esen²,

Sen³

et al. 2018

Int. J. Comput. Phys. Ser.

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A theoretical post-dryout heat transfer model is developed for two-phase dispersed flow, one-dimensional vertical pipe in a post-CHF regime. Because of the presence of average droplet diameter lower bound in a two-phase sparse flow. Droplet diameter is also calculated. Obtained results are compared with experimental values. Experimental data is used two-phase flow steam-water in VVER-1200, reactor coolant system, reactor operating pressure is 16.2 MPa. On heater rod surface, dryout was detected as a result of jumping increase of the heater rod surface temperature. Results obtained display lower droplet dimensions than the experimentally obtained values.

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Study of a fine-mesh 1:1 Computational Fluid Dynamics – Monte Carlo neutron transport coupling method with discretization uncertainty estimation

Vieira

Barros

Campolina

et al. 2020

Annals of Nuclear Energy

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Two-phase CFD simulation of research reactor siphon breakers: A verification, validation and applicability study

Cited by 6 publications

References 10 publications

Impact Analysis of Slope on the Head Loss of Gas-Liquid Two-Phase Flow in Siphon Pipe

Impact Analysis of Slope on the Head Loss of Gas-Liquid Two-Phase Flow in Siphon Pipe

Theoretical Post-Dryout Heat Transfer Model

Study of a fine-mesh 1:1 Computational Fluid Dynamics – Monte Carlo neutron transport coupling method with discretization uncertainty estimation

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