The relation between the rate of erosion wear of a pitched blade impeller and its process characteristics

Fořt, Ivan; Jirout, Tomáš

doi:10.1016/j.cherd.2011.01.024

Cited by 8 publications

(5 citation statements)

References 19 publications

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“…A comparison between the impeller flow rate number determined by CFD simulation N Qp , comp and that determined experimentally N Qp , exp (Fořt and Jirout, 2011;Fořt, 1986) is presented in Table 1 for pitched angle α = 45°, and in Table 2 for α = 30°. It follows from the tables that the impeller pumping capacity decreases with changes in the impeller blade due to the erosion process for both investigated values of angle α.…”

Section: Resultsmentioning

confidence: 99%

“…2), with water as the working liquid (density ρ 1 = 1000 kg m -3 , dynamic viscosity μ = 1mPa s) and corundum particles (mean volumetric particle diameter d p = 0.21 mm and mean volumetric particle concentration of x V = 5%). Measurements were carried out by the authors and were already published (see Fořt et al, 2011). The impeller speed was held constant n = 300 min…”

Section: Methodsmentioning

confidence: 99%

“…In some applications this wear may be so severe as to limit the life of a component or plant (Fořt and Jirout, 2011), while in others it may be negligible (Hutchings, 1987).…”

Section: Introductionmentioning

confidence: 99%

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A Study of CFD Simulations of the Flow Pattern in an Agitated System with a Pitched Blade Worn Turbine

Skočilas¹,

Fořt²,

Jirout³

2013

Chemical and Process Engineering

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This paper presents a numerical analysis of an agitated fully baffled cylindrical vessel with a down pumping four blade worn or unworn pitched blade impeller (α = 45° and 30°) under a turbulent flow regime. CFD simulations predict the pumping capacity of the system equipped by worn and unworn pitched blade impeller. Experimental data were taken from the authors' previous work and compared with results of numerical computations. A good agreement with experimental data was obtained. The ensemble-average mean velocity field with worn and unworn impellers was computed. It follows from the simulation results that the wear rate of the impeller blade has a significantly negative effect on the velocity distribution in an agitated liquid. The greater the destruction of the worn blade, the higher is the deformation of the velocity field around the rotating impeller, with a simultaneous decrease in impeller pumping capacity.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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A Study of CFD Simulations of the Flow Pattern in an Agitated System with a Pitched Blade Worn Turbine

Skočilas¹,

Fořt²,

Jirout³

2013

Chemical and Process Engineering

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“…Shape wear of the agitator blades results in a change in the geometric shape of the agitator. As a result, its pumping efficiency decreases, and thus other process characteristics change [41], which can lead to deterioration of product quality. An illustration of the changes in process parameters, in particular homogenization effects, caused by the shape erosive wear of the agitator blades is shown in Figure 19.…”

Section: Special Aspects Of Mixing Equipment Designmentioning

confidence: 99%

Application of Theoretical and Experimental Findings for Optimization of Mixing Processes and Equipment

Jirout

Jiroutová

2020

Processes

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The homogenization of the agitated batch and ensuring the suspension of particles are the most frequently encountered requirements in terms of mixing applications. These operations are affected by the flow of the agitated batch. The geometrical parameters of the mixing system, especially the shape of the agitator blade, affect flow and circulation in the agitated batch. The present work provides a general description of the most common processes in the agitated batch (blending and particle suspension), hydrodynamic parameters (flow in agitated batches, pumping and circulation capacity of impellers) and the geometrical configurations of the mixing equipment (shape of vessel, baffle and impeller, and their mutual arrangement) that influence the process. The dimensionless process characteristics of the agitator were derived by theoretical analysis. These characteristics were applied to evaluate an extensive set of experimental data with various geometric configurations of the mixing equipment. This study shows how the flow in the agitated batch, caused by the pumping and circulating effects of the agitators, affects the parameters and energy efficiency of these processes, depending on the geometric configuration of the mixing equipment. Moreover, the benefits of the hydrofoil impellers used for these mixing processes are presented.

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“…The flow properties include flow rate and structure, density of flow, and solids concentration [4,6,7,12,13]. Geometry parameters, for an impeller specifically, include inlet and outlet angle, number of blades, the presence or absence of a diffuser, and other pump internal features that influence flow structure [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Rapid Wear Modelling in a Slurry Pump Using Soft 3D Impeller Material

2020

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Slurry transport systems are often limited in run length by the life of the pump internals, especially the impeller. The present work investigated abrasive wear of the impeller of a Hayward Gordon XR2(7) Torus Recessed Impeller slurry pump in a flow loop. The stock stainless steel impeller was replaced by a set of plastic test impellers with the same nominal geometry, fabricated by additive manufacturing (3D printing). A parametric set of abrasive wear experiments was conducted at five pump rotational speeds and three solid concentrations of garnet slurry in a pipe flow loop. Pump performance tests were conducted using impellers with progressive wear conditions, to investigate how a worn impeller affects hydraulic power delivery. A parabolic fit was imposed to describe the relationship between head and flow rate, and an empirical model was proposed to predict the pump head with damaged impellers. When the rotational speed is high, the damaged impeller has a larger effect on the pump’s performance than when the rotational speed is low. The head difference between the undamaged impeller and a 7.62%-mass-loss damaged impeller was 1.5 m at 1750 rpm rotational speed, however, for 850 rpm, the head difference was 1 m. Implications for pump diagnostics in other types of systems are discussed. This experiment gives a method for rapidly assessing wear locations, and provides a tool to predict wear rates on harder materials if scaling parameters are available. This first attempt at a scaling law is not reliable enough to accurately predict the wear rate for specific conditions, but shows the relative wear as a function of pertinent parameters.

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The relation between the rate of erosion wear of a pitched blade impeller and its process characteristics

Cited by 8 publications

References 19 publications

A Study of CFD Simulations of the Flow Pattern in an Agitated System with a Pitched Blade Worn Turbine

A Study of CFD Simulations of the Flow Pattern in an Agitated System with a Pitched Blade Worn Turbine

Application of Theoretical and Experimental Findings for Optimization of Mixing Processes and Equipment

Rapid Wear Modelling in a Slurry Pump Using Soft 3D Impeller Material

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