Local Wall Shear Stress Variations Predicted by Computational Fluid Dynamics for Hygienic Design

Jensen, Bo Boye Busk; Friis, Alan; Bénézech, Thierry; Legentilhomme, P.; Lelièvre, C.

doi:10.1205/fbp.04021

Cited by 45 publications

(40 citation statements)

References 14 publications

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“…Hydrodynamic effects are crucial for the cleaning efficiency, through the shear stress forces acting at the equipment walls (Lelièvre et al, 2002;Jensen et al, 2005;Blel et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Conditioning materials with biomacromolecules: Composition of the adlayer and influence on cleanability

Toure

Genet

Dupont‐Gillain

et al. 2014

Journal of Colloid and Interface Science

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AbbreviationsBSA: bovine serum albumin RFC: radial flow cell XPS: X-ray photoelectron spectroscopy 2 ABSTRACTThe influence of substrate hydrophobicity and biomacromolecules (dextran, bovine serum albumin -BSA) adsorption on the cleanability of surfaces soiled by spraying aqueous suspensions of quartz particles (10 to 30 µm size), then dried, was investigated using glass and polystyrene as substrates. The cleanability was evaluated using radial flow cell (RFC).The surface composition was determined by X-ray photoelectron spectroscopy (XPS). The interpretation of XPS data allowed the complexity due to the ubiquitous presence of organic contaminants to be coped with, and the surface composition to be expressed in terms of both the amount of adlayer and the mass concentration of adlayer constituents.When soiled with a suspension of particles in water, glass was much less cleanable than polystyrene, which was attributed to its much lower water contact angle, in agreement with previous observations on starch soil. Dextran was easily desorbed and did not affect the cleanability. The presence of BSA at the interface strongly improved the cleanability of glass while the contact angle did not change appreciably. In contrast, soiling polystyrene with quartz particles suspended in a BSA solution instead of water did not change markedly the cleanability, while the contact angle was much lower and the aggregates of soiling particles were more flat. These observations are explained by the major role of capillary forces developed upon drying, which influence the closeness of the contact between the soiling particles and the substrate and, thereby, the adherence of particles. The capillary forces are proportional to the liquid surface tension and depend in a more complex way on contact angles of the particles and of the substrate. The dependence of cleanability on capillary forces, and in particular on the liquid surface tension, is predominant as compared with its dependence on the size and shape of the soiling aggregates, which influence the efficiency of shear forces exerted by the flowing water upon cleaning.

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“…Hydrodynamic effects are crucial for the cleaning efficiency, through the shear stress forces acting at the equipment walls (Lelièvre et al, 2002;Jensen et al, 2005;Blel et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Conditioning materials with biomacromolecules: Composition of the adlayer and influence on cleanability

Toure

Genet

Dupont‐Gillain

et al. 2014

Journal of Colloid and Interface Science

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“…Previous studies have shown the influence of local wall shear stress values on cleaning efficiency (Jensen et al, 2005;Lelièvre et al, 2003). Indeed, cleaning fluid shear forces at fluid/equipment interfaces have been shown in several studies to be of importance in detaching bacterial cells, which occurs only if the hydraulic shear stress exceeds the adhesion force, depending on the type of micro-organism and on the duration of contact with the soiled surface (De Jong et al, 2002;Hermanowicz et al, 1989).…”

Section: Introductionmentioning

confidence: 99%

“…It was shown that such hydraulic accidents strongly influence the flow arrangement inside production lines (Rizk et al, 1996;Vujičić and Crnojević, 2003). Due to the link between bacterial removal and the flow arrangement inside pipes, several studies were carried out in order to explain the residual contamination level upstream and downstream of these geometries after a CIP procedure (Jensen et al, 2005;Lelièvre et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

Effect of flow arrangement on the removal of Bacillus spores from stainless steel equipment surfaces during a Cleaning In Place procedure

Blel

Bénézech²,

Legentilhomme

et al. 2007

Chemical Engineering Science

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“…However, it spends a lot of time and costs a lot. Therefore, Computational Fluid Dynamics (CFD) is introduced to simulate the wall shear stress [6][7][8][9]. Moreover, it is also widely used to simulate the flow velocity of fluid and other applications about a decade [10][11].…”

Section: Introductionmentioning

confidence: 99%

A CFD study on wall shear stress of falling water film on food contact surface

Nawaporn

Nunak

2018

MATEC Web Conf.

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Abstract. This paper proposes a CFD model to simulate the wall shear stress of the falling water film on the hydrophilic surface (aluminum) of the inclined flat plate in the range of 30°, 60° and 90° at a flow rate of 100, 200 and 300 L/h. Wall shear stress simulated from the CFD using SST k-ω with the VOF model was compared with the real data obtained from the experiment. It was found that both inclined angle and water flow rate had an effect to the wall shear stress and the CFD with the proposed model had the potential to predict it with the maximum averaged error of 2.9%.

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Local Wall Shear Stress Variations Predicted by Computational Fluid Dynamics for Hygienic Design

Cited by 45 publications

References 14 publications

Conditioning materials with biomacromolecules: Composition of the adlayer and influence on cleanability

Conditioning materials with biomacromolecules: Composition of the adlayer and influence on cleanability

Effect of flow arrangement on the removal of Bacillus spores from stainless steel equipment surfaces during a Cleaning In Place procedure

A CFD study on wall shear stress of falling water film on food contact surface

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