Measurement of turbulent flow phenomena for the lower plenum of a prismatic gas-cooled reactor

McIlroy, Hugh M.; McEligot, Donald M.; Pink, Robert J.

doi:10.1016/j.nucengdes.2008.07.020

Cited by 21 publications

(8 citation statements)

References 4 publications

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“…Fused quartz has featured in numerous RIM systems, including an RIM facility described by Stoots et al (2001) for the purposes LDA flow studies around complex geometries for which the fused quartz observational sections of the facility were RI matched at 1.459 to a light mineral oil ("Penreco Drakeol #5"). McIlroy et al (2010) then employed this flow system to study the turbulent flow in a gas-cooled reactor part using tomographic PIV.…”

Section: Glassesmentioning

confidence: 99%

A review of solid–fluid selection options for optical-based measurements in single-phase liquid, two-phase liquid–liquid and multiphase solid–liquid flows

2017

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Experimental techniques based on optical measurement principles have experienced significant growth in recent decades. They are able to provide detailed information with high-spatiotemporal resolution on important scalar (e.g., temperature, concentration, and phase) and vector (e.g., velocity) fields in single-phase or multiphase flows, as well as interfacial characteristics in the latter, which has been instrumental to step-changes in our fundamental understanding of these flows, and the development and validation of advanced models with ever-improving predictive accuracy and reliability. Relevant techniques rely upon well-established optical methods such as direct photography, laser-induced fluorescence, laser Doppler velocimetry/phase Doppler anemometry, particle image/tracking velocimetry, and variants thereof. The accuracy of the resulting data depends on numerous factors including, importantly, the refractive indices of the solids and liquids used. The best results are obtained when the observational materials have closely matched refractive indices, including test-section walls, liquid phases, and any suspended particles. This paper reviews solid–liquid and solid–liquid–liquid refractive-index-matched systems employed in different fields, e.g., multiphase flows, turbomachinery, bio-fluid flows, with an emphasis on liquid–liquid systems. The refractive indices of various aqueous and organic phases found in the literature span the range 1.330–1.620 and 1.251–1.637, respectively, allowing the identification of appropriate combinations to match selected transparent or translucent plastics/polymers, glasses, or custom materials in single-phase liquid or multiphase liquid–liquid flow systems. In addition, the refractive indices of fluids can be further tuned with the use of additives, which also allows for the matching of important flow similarity parameters such as density and viscosity

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Section: Glassesmentioning

confidence: 99%

A review of solid–fluid selection options for optical-based measurements in single-phase liquid, two-phase liquid–liquid and multiphase solid–liquid flows

2017

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“…To accomplish this objective the flow inside the lower plenum model was characterized with velocity-vector fields and fourteen scalar quantities. McIlroy et al [10] provides a list that defines the vector and scalar field measurements that were obtained.…”

Section: Resultsmentioning

confidence: 99%

Measurement of Flow Phenomena in a Lower Plenum Model of a Prismatic Gas-Cooled Reactor

McIlroy

McEligot

Pink

2008

Volume 3: Thermal Hydraulics; Instrumentation and Controls

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“…Particle Image Velocimetry has been developed and demonstrated as the main tool within the MIR facility for obtaining validation-quality data on velocity fields for benchmarking and validating CFD turbulence models 9 . The NGNP program has utilized the MIR to study flow fields in the lower plena as a first step towards CFD code validation 10 .…”

Section: An Historical Perspective Of Nuclear Plant Verification and mentioning

confidence: 99%

Verification and Validation Strategy for LWRS Tools

Stoots¹,

Schultz²,

Gougar³

et al. 2012

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SUMMARYThe US Department of Energy Light Water Reactor Sustainability (LWRS) Program is focused on enabling the long-term operation of US commercial power plants. Commercial power plant owners will make the decisions on life extension -the information provided by the research and development activities in the LWRS Program will reduce the uncertainty (and therefore the risk) associated with making those decisions.Modeling and simulation activities are an important part of the LWRS Program. Advanced tools that represent more accurately (when compared with currently used tools) the behavior of nuclear power plants, in particular as they age, can be an important tool to inform life extension decisions, and could potentially be used in licensing activities. However, before these tools can be used to inform decisions or support licensing activities, they will need to be adequately verified and validated (V&V'ed). The acceptable level of V&V is ultimately the decision of the nuclear power plant owners (who would use the tools to inform life-extension decisions) and the NRC (if the tools are used to support licensing). Although this report is focused on the LWRS Program, it is broadly applicable to advanced modeling and simulation activities.Significant and continuing advances in computer simulation and rising costs of building and conducting test facilities are increasing the reliance on complex models in licensing facilities, optimizing designs, improving performance, and understanding the underlying science. At the same time, however, the complexity of these models and associated computational methods present unprecedented challenges for code verification, validation, and uncertainty quantification (VVUQ).In general, the VVUQ Strategy should:1. Be driven by the needs of the users (for this program, the LWR industry) 2. Distinguish between and address the needs of licensing, design and performance, and aging/life extension 3. Demonstrate the effectiveness of the methodology by executing one or more well-defined problems early in the process to establish good practices and instill confidence within the user community 4. Utilize a rigorous and integrated approach to code development and VVUQ that is accepted by industry (to inform life-extension decisions) and regulators (if the tools are used to support licensing) 5. Recognize the complementary nature of system and multiphysics/multiscale codes, addressing the unique challenges in VVUQ including gaps in understanding (physical models) and coupling of phenomena across physics, time and length scales 6. Acknowledge and identify gaps in data and re-establish the pedigree of legacy data, exploiting it in a cost-effective manner.iv v CONTENTS

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Measurement of turbulent flow phenomena for the lower plenum of a prismatic gas-cooled reactor

Cited by 21 publications

References 4 publications

A review of solid–fluid selection options for optical-based measurements in single-phase liquid, two-phase liquid–liquid and multiphase solid–liquid flows

A review of solid–fluid selection options for optical-based measurements in single-phase liquid, two-phase liquid–liquid and multiphase solid–liquid flows

Measurement of Flow Phenomena in a Lower Plenum Model of a Prismatic Gas-Cooled Reactor

Verification and Validation Strategy for LWRS Tools

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