Experimental study of turbulent cross-flow in a staggered tube bundle using particle image velocimetry

Paul, Samuel S.; Tachie, Mark F.; Ormiston, S.J.

doi:10.1016/j.ijheatfluidflow.2006.06.001

Cited by 75 publications

(46 citation statements)

References 15 publications

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“…Žukauskas and Ulinskas [6] reported extensive experimental data for heat transfer and fluid friction during viscous cross-flow in-line and staggered banks of tubes under two thermal boundary conditions. Paul et al [7] preformed measurements in a staggered tube bundle with fixed pitch-to-diameter ratios at subcritical Reynolds number using the particle image velocimetry technique. Their results showed that the flow exhibits strong Reynolds number dependence in the developing region, however no significant Reynolds number effect could be observed in the spatially periodic region.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of turbulence intensity influence for turbulent cross flow in staggered tube bundle using grooved cylinder

Sahli

Adjlout

Ladjedel

et al. 2016

EPJ Web of Conferences

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Abstract. The present work is an experimental investigation on the effect of the turbulence intensity variation in a staggered tube bundle equipped with grooves at 90° and 270°.The experiments were carried out in a subsonic wind tunnel. Three Reynolds numbers and three turbulence levels were tested. The pressure distributions and drag forces were measured. Surface visualizations were also performed. The obtained results show that the turbulence intensity for different Reynolds number has an influence on the reduction of the drag coefficient.

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Section: Introductionmentioning

confidence: 99%

Experimental study of turbulence intensity influence for turbulent cross flow in staggered tube bundle using grooved cylinder

Sahli

Adjlout

Ladjedel

et al. 2016

EPJ Web of Conferences

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“…Rottmann and Popp [4] further investigated the influence of approach flow on the first row of tube bundles. Paul et al [5] preformed measurements in a staggered tube bundle with fixed pitch-to-diameter ratios at sub-critical Reynolds number using the particle image velocimetry technique. Their results showed that the flow exhibits strong Reynolds number dependence in the developing region, however no significant Reynolds number effect could be observed in the spatially periodic region.…”

Section: Introductionmentioning

confidence: 99%

CFD analysis of turbulent cross-flow in a staggered tube bundle equipped with grooved cylinders

Ladjedel

Adjlout

Yahiaoui

et al. 2013

EPJ Web of Conferences

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Abstract. This study describes the Computational Fluid Dynamics (CFD) analysis of the turbulent cross-flow in a staggered tube bundle with transverse and longitudinal pitch-to-diameter ratio of 3.8 and 2.1 respectively. Two Longitudinal grooves are placed on the external surface at 90° and 270° degrees. Each cylinder has two grooves on the external surface of the cylinder. The Navier-Stokes equations of the turbulent flow are solved using Spalart almaras, k- realizable and k-SST, turbulence models provided by Fluent CFD code. The staggered tube bundle geometry simulations were performed at steady conditions. An adapted grid using static pressure, pressure coefficient and velocity gradient, furthermore, a second order upwind scheme were used. The CFD results were in agreement with the experimental data. The study demonstrates the capability of the CFD calculations in predicting flow characteristics around the bundle.

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“…A similar tendency was reported by Barata et al (1992) for round impinging jets in crossflow. This trend also holds in bidimensional flow across a tube bundle, where the streamwise turbulence intensity is lower than the transverse turbulence intensity (Paul et al, 2007). This might suggest that an increase of the inlet mass flow rate results in an enhancement of turbulence uniformly both radially and axially.…”

Section: Jet Trajectorymentioning

confidence: 63%

“…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%

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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 ...

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Experimental study of turbulent cross-flow in a staggered tube bundle using particle image velocimetry

Cited by 75 publications

References 15 publications

Experimental study of turbulence intensity influence for turbulent cross flow in staggered tube bundle using grooved cylinder

Experimental study of turbulence intensity influence for turbulent cross flow in staggered tube bundle using grooved cylinder

CFD analysis of turbulent cross-flow in a staggered tube bundle equipped with grooved cylinders

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

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