Fundamentals of fluid motion in erosion by solid particle impact

Humphrey, J. A. C.

doi:10.1016/0142-727x(90)90036-b

Cited by 215 publications

(80 citation statements)

References 121 publications

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“…16 and 17. These phenomena are consistent with the experimental observations for a pipe bend [30]. Figure 18 shows vorticity distributions at the vertical mid-plane of the 3H evaporator lift-separator jumper.…”

Section: Results Of the Erosion Model For The Misaligned U2 Nozzlesupporting

confidence: 80%

“…The turbulence intensity is proportional to the square root of the turbulent kinetic energy, κ, for a given mean fluid velocity. The literature information [30] shows an erosion decrease with increasing turbulence intensity, since the degree of slurry interactions with the wall boundary decreases with increasing turbulence. Figure 12 shows static pressure distributions corresponding to the flow distributions shown in Fig.…”

Section: Results Of the Erosion Model For The Misaligned U2 Nozzlementioning

confidence: 99%

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Erosion Analysis for the Misaligned U2 Nozzle and its Connector Block

Lee¹

2002

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Section: Results Of the Erosion Model For The Misaligned U2 Nozzlesupporting

confidence: 80%

Section: Results Of the Erosion Model For The Misaligned U2 Nozzlementioning

confidence: 99%

Erosion Analysis for the Misaligned U2 Nozzle and its Connector Block

Lee¹

2002

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“…This approach, when coupled with correct selection of blade material, will greatly extend the service life of impellers used in high-intensity agitation applications. This fl uid mechanics-based approach is justifi ed, as wear rate is sensitive to the fl ow fi eld, since it is a function of particle velocity and particle impingement angle (Laitone, 1979;Humphrey, 1990;Finnie, 1995 1995;Zhang et al, 2000), for given material and physical properties of the particles.Wear on mixing impeller blades is a somewhat less frequently discussed topic in the mixing research community, with only a handful of papers in the literature reporting research on this issue. Weetman (1998) used computational fl uid dynamics (CFD) simulations to redesign the blade geometry, so as to modify the velocity distribution along an aerofoil section of an axial fl ow impeller.…”

mentioning

confidence: 99%

Minimizing Impeller Slurry Wear through Multilayer Paint Modelling

Ngyuen

Graham

et al. 2008

Can. J. Chem. Eng.

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I n industries such as mineral processing, high agitation intensity is sometimes used to achieve the required solids suspension and gas-to-liquid mass transfer rate in threephase systems. However, the high slurry velocities used in a high-intensity agitation vessel may result in particle impingement wear on the impeller blades.Wear by particulates on industrial equipment, and metal materials in general, has been the subject of substantial research efforts over many years (e.g. Blau, 1997;Deuis et al., 1996;Hutchings, 1987). It is general practice in industry to use wearresistant materials, coatings or surface treatments to reduce the wear rate. The present work aims to reduce wear rates by modifying the geometry of mixer impeller blades. This approach, when coupled with correct selection of blade material, will greatly extend the service life of impellers used in high-intensity agitation applications. This fl uid mechanics-based approach is justifi ed, as wear rate is sensitive to the fl ow fi eld, since it is a function of particle velocity and particle impingement angle (Laitone, 1979;Humphrey, 1990;Finnie, 1995 1995;Zhang et al., 2000), for given material and physical properties of the particles.Wear on mixing impeller blades is a somewhat less frequently discussed topic in the mixing research community, with only a handful of papers in the literature reporting research on this issue. Weetman (1998) used computational fl uid dynamics (CFD) simulations to redesign the blade geometry, so as to modify the velocity distribution along an aerofoil section of an axial fl ow impeller. He was able to reduce the maximum velocity at the leading edge of the impeller blade, leading to a signifi cant reduction in the wear rate. Fort and Ambros (1999) carried out an analytical study of the erosion of blades of pitch bladed impellers.Much experience can be drawn from the substantial amount of literature available on centrifugal pump impeller wear. Walker (2001;2002) studied in detail the wear patterns developed onThe present paper describes an experimental study using a multilayer paint technique to illustrate the wear patterns developed on an eightbladed disc turbine in a gas/liquid/solids three-phase mixing tank. A distinctive wear pattern was found to develop on the low-pressure side of the blades. The patterns were found to be caused by the two intersecting vortices that developed along the blades. Several modifi cations were made to the impeller geometry to reduce wear. A new impeller design, which experienced a lower wear rate and showed an improved offbottom solids suspension performance, is recommended for operating in gas/liquid/solids reactors.On décrit dans le présent article une étude expérimentale utilisant une technique de peinture multicouche afi n d'illustrer les modes d'usure sur une turbine à disque à huit pales dans un réservoir de mélange triphasique gaz-liquide-solide. On a trouvé qu'un mode d'usure distinct se développait du côté basse pression des pales. On a trouvé que les modes d'usure étaient causés...

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“…To ensure the smooth production of gas well, many downhole throttles were wildly used in Sulige gas field. But some new problems were raised, the life of the throttle and the loss caused by the failure [1][2].…”

Section: Introductionmentioning

confidence: 99%