Developed single phase turbulent flow through a square-pitch rod cluster

Hooper, J.D.

doi:10.1016/0029-5493(80)90302-7

Cited by 49 publications

(18 citation statements)

References 7 publications

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“…Besides the other correlations presented in Table 2.4, Hooper's experimental observations suggest otherwise [42]. For y , < 1.2, the product u,St, rises dramatically.…”

Section: Jijmentioning

confidence: 90%

A Numerical Investigation of Turbulent Interchange Mixing of Axial Coolant Flow in Rod Bundle Geometries

Rock

Lightstone

2001

Numerical Heat Transfer, Part A: Applications

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This manuscript has been reproduced from the microfilm master. UMI films the text directly from the original or copy submitted. Thus. some thesis and dissertation copies are in typwriter face, while others may be from any type of cornputer printer.The quality of this reproduction is dependent upon the quality of the copy submitted. Broken or indistinct prÏnt, colored or poor quality illustrations and photographs, print bleedthrough, substandard margins, and improper alignment c m adversely affect reproduction.In the unlikely event that the author did not send UMI a complete manuscript and there are missing pages. these will be noted. Also, if unauthonzed copyright material had to be rernoved, a note will indicate the deletion.Oversize materials (e-g., maps, drawings, charts) are reproduoed by sedioning the original, beginning at the upper left-hand corner and continuing from left to right in equal sections with small overlaps. Each original is also photographed in one exposure and is induded in reduced form at the back of the book.Photographs included in the original manuscript have been reproduced xerographically in this copy. Higher quality 6" x 9" black and white photographic prints are available for any photographs or illustrations appearing in this copy for an additional charge. Contact UMI directly to order. As a result, radial diffusion processes (such as pressure drop) were predicted accuratelbut azimuthal diffusion processes (such as turbulent interchange rnixing) were underpredicted. An isotropic eddy viscosity turbulence model, therefore, is not recommended for analysis of turbulent interchange mixing. Acknowledgement sWithout question, this Masters thesis benefited k o m the assistance of a number of people.For technical advice and support, 1 thank

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“…Besides the other correlations presented in Table 2.4, Hooper's experimental observations suggest otherwise [42]. For y , < 1.2, the product u,St, rises dramatically.…”

Section: Jijmentioning

confidence: 90%

A Numerical Investigation of Turbulent Interchange Mixing of Axial Coolant Flow in Rod Bundle Geometries

Rock

Lightstone

2001

Numerical Heat Transfer, Part A: Applications

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“…The attempts to measure secondary-flows failed in most cases, being measurable only for closed subchannels or with very narrow gaps, as described in the work of Seale (1979). Later, Hooper (1980), Hooper and Rehme (1984), and Renksizbulut and Hadaller (1986) showed the existence of large-scale instabilities in one-phase incompressible flow causing large pulsations across the gap. These instabilities were found in subchannels connected by narrow gaps or pitch to diameter (P/D) relations of approximately 1.2 or smaller, and the intensity was found to increase as the gap is reduced.…”

Section: A Bmentioning

confidence: 97%

“…Hot Wire Anemometry). These two methods have been widely used in the study of flows past rod-bundles (some examples are the works of Hooper, 1980;Hooper and Rehme, 1984;Renksizbulut and Hadaller, 1986;Wu and Trupp, 1994), giving local information about velocities and turbulence components. Thermal anemometry usually involves the use of large test sections due to the relatively large size of the probes.…”

Section: A Bmentioning

confidence: 99%

Thermal mixing between subchannels: measurement method and applications

Silin

Juanicó

Delmastro

2004

Nuclear Engineering and Design

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“…However, investigations carried out by other authors on scenarios with some similarities were reviewed to support the present research. In particular, a survey has been conducted on: turbulent radial free jets (Abramovich, 1963;Schwarz, 1963;Heskestad, 1966;Rajaratman, 1976;Witze & Dwyer, 1976), jets from elliptical or rectangular orifices with high aspect ratio (Rajaratman 1976;Quinn 1989;Hussain et al, 1989;New et al 2003New et al , 2004Lee et al 1994Lee et al , 2000, plane jets in cross-flow (Girshovich, 1966;Choi & Wood, 1966), impinging jets on cylinders (Schuh & Pearson, 1964;Sparrow & Lovell, 1980;Cornaro et al, 1999), cross-flow streams in a tube bundle (Simoin & Barcouda, 1988;Meyer, 1994;Balabani & Yianneskis, 1996;Paul et al, 2007) and axial flow streams in a tube bundle (Seale, 1980;Hooper, 1980;Rowe et al, 1974).…”

Section: State Of Art On the Aerodynamics Of Jets From A Tube Breach mentioning

confidence: 99%

“…Insights into the turbulence behaviour through the subchannels of a rod bundle were obtained by Hooper (1980), Rowe et al (1974). They found that turbulence structures for axial fully developed flow through the subchannels depend on the pitch-todiameter ratio p/D.…”

Section: State Of Art On the Aerodynamics Of Jets From A Tube Breach mentioning

confidence: 99%

Experimental characterization of aerosol retention in the break stage of a dry steam generator in SGTR sequences.

Velasco¹,

Javier²

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Severe accident Steam Generator Tube Rupture (SGTR) sequences are identified as major contributors to risk of Pressurized Water Reactors (PWR). Their relevance lies in the potential radioactive release, in form of aerosol, from reactor coolant system to the environment. However, radioactive particles could be partially retained in the secondary side of the steam generator, even in the absence of water. Lack of knowledge on the source term attenuation capability of the steam generator has avoided its consideration in probabilistic safety studies and severe accident management guidelines. As a consequence, the steam generator filtering capability is not usually taken into account either in the probabilistic risk assessment of nuclear safety or in the severe accident management guidelines.This thesis describes the main activities and results of a bench-scale experimental program focused on getting insights into the aerosol retention in the break stage of the secondary side of a dry steam generator. The thesis is framed in the CIEMAT contribution to the ARTIST project (2003)(2004)(2005)(2006)(2007)(2008) which was supported by te Spanish Nuclear Regulatory Commission (CSN). The general objective of the work was to generate a comprehensive database on fission product retention in the break stage of a dry steam generator during a severe accident SGTR sequence. The specific objectives were to assess the influence of aerodynamic flow field as well as the influence of particle nature on aerosol deposition in the tube bundle. To do so, a scaled-down mock-up with representative dimensions of a real SG was built. The aerodynamic characterization of the flow field within the break stage of the bundle was done via 2D PIV (particle image velocimetry) technique. The particle nature influence on retention was characterized through aerosol retention experiments in the tube bundle mock-up. The major variables investigated were the type of breach (guillotine vs fish-mouth), the inlet gas mass flow rate (75-250 kg/h) and the particle type (polidispersed TiO 2 agglomerates vs. solid, monodisperse SiO 2 spheres).The aerodynamic campaign permitted to characterize the flow field close to the breach for both type of breaches and to asses their similarities. Results showed that the jet flows within the tube bundle following a generic quasi-parabolic trajectory evolving from an oblique cross flow configuration to an axial one. Mean flow field near the breach is substantially affected by the entrainment of initially stagnant gas into the jet. This effect is fostered by the presence of tubes and their tight packing. Jet penetration and turbulence intensity are considerably enhanced when increasing inlet gas mass flow rate.The results of the aerosol campaign showed that particle nature substantially affects retention in the tube bundle: mass retention was low for TiO 2 agglomerates (less than 30%) whereas it was much higher for SiO 2 particles (around 85%). Collection efficiency is also affected by gas mass flow rate: its sensitivity ...

show abstract

Developed single phase turbulent flow through a square-pitch rod cluster

Cited by 49 publications

References 7 publications

A Numerical Investigation of Turbulent Interchange Mixing of Axial Coolant Flow in Rod Bundle Geometries

A Numerical Investigation of Turbulent Interchange Mixing of Axial Coolant Flow in Rod Bundle Geometries

Thermal mixing between subchannels: measurement method and applications

Experimental characterization of aerosol retention in the break stage of a dry steam generator in SGTR sequences.

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