Experimental and numerical investigation of coolant mixing in a model of reactor pressure vessel down-comer and in cold leg inlets

Hutli, Ezddin; Gottlasz, Valer; Farkas, I.; Ézsöl, György; Baranyai, G.

doi:10.2298/tsci140915121h

Cited by 4 publications

(2 citation statements)

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“…Although the testing of two-phase fluid flow is still being intensively studied [34,35], there is still no definite general model describing the process. The constantly evolving methods of analysis allow the verification of emerging numerical models that facilitate the design process of equipment implementing two-phase flow [36], both gas-liquid and gas-solid [37] or even liquid-solid [38].…”

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confidence: 99%

Application of videogrammetry in the mechanics of multi-phase systems

Anweiler

Ulbrich

2020

THERM SCI

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This paper is a description of the evolution of long-term research work on two-phase flows using parallel studies of dynamic image analysis and stochastic processes analysis. The state of current knowledge on the research of gas-solid and gas-liquid systems as well as a review of research relating to these issues are also presented. The work grants the principles of videogrammetric surveys based on stochastic analysis for a series of photographs taken with video techniques. The method applies the analysis of changes in selected features and parameters in the time domain. Especially in application to multiphase gas-liquid and solid-gas mixture flows, which are characterized by strong variabilities. Parameters such as flow patterns of the mixture were determined as time-space distributions of phase concentration, displacement velocities of separated two-phase structures, volume partitions of phases, and velocity field distributions are evaluated. The changes of certain parameters characterizing the flow in the time domain often hide more useful information. The subject of this study covers the basics of videogrammetry with a description of two-phase mixture motion for co-current flow in channels, mapping of the phase velocity field, also across the tube bundle in shell-and-tube apparatus, phase motion at the flow of a two-phase gas-liquid mixture in mini-channels, transport of liquids in air-lift pump and fluidization of solid particles.

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Section: ( )mentioning

confidence: 99%

Application of videogrammetry in the mechanics of multi-phase systems

Anweiler

Ulbrich

2020

THERM SCI

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“…Particle Image Velocimetry is currently one of the best tools to determine the vector velocity field. In the industrial practice, the application possibilities of this technique have been widely documented, for example in mechanical engineering [15], process engineering [16], medicine [17], environmental engineering [18] and power industry [19]. The most important problem nowadays is the choice of appropriate measurement setup and its optical and software configuration [14].…”

Section: Introductionmentioning

confidence: 99%

Algorithms for determination of the vector velocity field in a two-phase gas-liquid flow

et al. 2020

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Energy efficiency is a key issue of sustainable development. During the design of industrial devices, it strives to achieve the highest possible energy efficiency. In the industrial systems, two-phase flow is a difficult task, especially the prediction and maintenance of the two-phase flow regime. That is why this research proposes the evaluation and choice of an algorithm that will give a hint of the device design for which the hydrodynamic conditions of the two-phase mixture flow may be evaluated. The tests were carried out in a rectangular vertical narrow channel, as this type of device is in common use. The work aimed to show which algorithm is better for such evaluation. Parameters such as pressure drop, heat, mass, and momentum transfer are influenced by the phase velocity field. Still, various models are used for the determination of the velocity field. Therefore there is a problem of choosing a model that will give the results closest to the real conditions. Flow visualization gives the noninvasive determination of the actual velocity field. An analysis of the velocity field was performed, which showed that for different two-phase flow regimes there are differences for given algorithms. The following algorithms were used to determine the velocity vector field: Adaptive Correlation Method and Adaptive Particle Image Velocity Method were used which are the parts of the general Digital Particle Image Velocimetry. The determination of the velocity fields in the quantitative and qualitative assessment of a given two-phase flow regime was obtained. The result of the research is the evaluation of algorithms for characterization two-phase gas-liquid flow.

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Thermal-hydraulic analysis of light water reactors under different steady-state operating conditions, Part 1: Boiling water reactor

Hutli

Kridan

2022

NUCL TECH RAD PROT

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The steady-state thermal-hydraulic analysis of the core of the Boiling Water Reactor (BWR/6) at nominal operating conditions is presented in this paper. The BWR/6 is produced by General Electric USA. The analysis' goal is to keep the thermal safety margin under control and the core integrity intact under steady-state operating conditions. The effects of operating conditions such as power distribution, power level, and coolant mass flow rate on the pro- posed core's performance are investigated. For this purpose, the one-dimensional computer code MITH was used. The code's reliability was tested using the General Electric benchmark 3579 MW reactor. Two-channel models were tested (the average and the hot channel). Ther- mal-hydraulic parameters such as fuel-centerline, fuel-surface, outer clad surface and coolant temperature, critical and actual local heat flux, critical and minimum critical heat flux ratio and pressure drop are evaluated along the tested channels. Temperatures, as well as actual and critical heat flux distribution profiles, were obtained. The tested operating conditions had a significant influence on these parameters, and also on the thermal-hydraulic performance. The obtained results are in good agreement with the data from the tested core. The obtained results are well within the safety margins. The good agreement between tested reactor data and MITH code calculation concerning the reactor demonstrates the reliability of the analysis methodology from a thermal-hydraulic perspective.

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Experimental and numerical investigation of coolant mixing in a model of reactor pressure vessel down-comer and in cold leg inlets

Cited by 4 publications

References 1 publication

Application of videogrammetry in the mechanics of multi-phase systems

Application of videogrammetry in the mechanics of multi-phase systems

Algorithms for determination of the vector velocity field in a two-phase gas-liquid flow

Thermal-hydraulic analysis of light water reactors under different steady-state operating conditions, Part 1: Boiling water reactor

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