Axial and radial void fraction measurements in convective boiling flows

Yadav, Ashutosh; Roy, Shantanu

doi:10.1016/j.ces.2016.04.038

Cited by 7 publications

(2 citation statements)

References 14 publications

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“…Traditionally, bubble diameters and void fractions were reported as integral or timeaveraged values at certain locations [4][5][6], with little or no information on the distribution of bubble sizes. Several authors report the departure, maximum and characteristic bubble sizes, both from experimental [7][8][9] and numerical points of view [10,11].…”

Section: Introductionmentioning

confidence: 99%

Experimental Analysis of Flow Boiling in Horizontal Annulus—The Effect of Heat Flux on Bubble Size Distributions

2022

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Subcooled flow boiling was experimentally investigated in a horizontal annulus with a temperature-controlled boiling surface and transparent outer pipe facilitating visualization. Boiling occurs on a copper tube with a diameter of 12 mm in an annulus with a 2 mm gap. Refrigerant R245fa is used as a working fluid. The focus of this study is to explore the effect of heat flux variation on the boiling flow patterns at approximately constant inlet flow conditions of the working fluid (fixed mass flux and inlet fluid temperature). Subcooled flow boiling is recorded by a high-speed camera, images are analyzed by a neural network to determine the bubble size distributions and their variation with the heat flux. The experimental setup being a part of the laboratory THELMA (Thermal Hydraulics experimental Laboratory for Multiphase Applications) at the Reactor Engineering Division of Jožef Stefan Institute, analysis methods and measurement results are presented and discussed.

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Section: Introductionmentioning

confidence: 99%

Experimental Analysis of Flow Boiling in Horizontal Annulus—The Effect of Heat Flux on Bubble Size Distributions

2022

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“…The vapor bubbles generated at the walls of the fuel rods disengage and wander radially as well as axially. Additionally, the vapor tends to segregate both radially and axially, which in turn drives the liquid circulation; hence, playing a vital role in the transport of thermal energy and momentum in the liquid phase . Therefore, information about the time‐averaged velocity of the liquid phase is of great significance for design and safe operation of BWRs.…”

Section: Introductionmentioning

confidence: 99%

Velocity measurements in convective boiling flow using radioactive particle tracking technique

2019

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The design, performance, and safety analysis of nuclear reactors, in particular boiling water reactors, requires information about the vapor-liquid flow dynamics. Such data are necessary for stand-alone analysis of the thermal hydraulics, as well as to serve as a database for validation of computational fluid dynamics models. Challenges in collecting such data are magnified in the context of flow boiling, which is known to be a complex, multi-scale problem. The present work focuses on investigating the two-phase flow dynamics of convective boiling flows on a test section equipped with different heater rods arrangements. Noninvasive radioactive particle tracking (RPT) has been used for measuring liquid velocity field, mean flow patterns, and turbulent kinetic energy of the liquid phase. A novel tracer particle reconstruction algorithm based on support vector regression has been applied in this study. This is the first application of RPT for measuring liquid velocity fields in convective boiling flows.

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Void fraction distribution for convective boiling flows in single and multiple heater rods assembly

Yadav

Roy

2022

Chemical Engineering Science

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Axial and radial void fraction measurements in convective boiling flows

Cited by 7 publications

References 14 publications

Experimental Analysis of Flow Boiling in Horizontal Annulus—The Effect of Heat Flux on Bubble Size Distributions

Experimental Analysis of Flow Boiling in Horizontal Annulus—The Effect of Heat Flux on Bubble Size Distributions

Velocity measurements in convective boiling flow using radioactive particle tracking technique

Void fraction distribution for convective boiling flows in single and multiple heater rods assembly

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