The effect of polymer additives on the characteristics of a centrifugal pump

Polishchuk, A. M.; Raiskii, Yu. D.; Temchin, A. Z.

doi:10.1007/bf00826795

Cited by 5 publications

(3 citation statements)

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“…The most significant effect of polymers could be the reduction of some internal losses of the pump, as clearance viscous dissipation and, in particular, disk and casing friction, 2–4 leading to more or less significant efficiency increments, depending on the mechanical structure of the pump.…”

Section: Resultsmentioning

confidence: 99%

“…Indeed, a cleaning product is a mixture of builders, surfactants, acids, alkalis, and other substances that influence in various manners the properties of the solution. 1 Polymers, in particular, could have an influence on pump performances 2–5 mainly due to the drag reduction caused by their presence, especially at high Reynolds numbers. As reported in Bird et al., 6 this effect was declared by Toms in 1948, observing that a small concentration of poly methyl methacrylate, approximately 10 ppm, diminished the friction factor, also if density and viscosity of the solution had a minor variation compared to the pure solvent.…”

Section: Introductionmentioning

confidence: 99%

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Experimental analysis of the influence of polymer solutions on performances and cavitation of small size pumps for professional appliances

Burlon

Micheli

Simonato³

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part E:

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Pumps used in professional appliances process a solution of water, soils residues and detergents. These affect vapor tension, viscosity and rheology of the solution, mainly due to the presence of surfactants and polymers. Only a few studies have been found on how these substances can influence pump performances. Therefore, an experimental analysis has been carried out with aqueous solutions of a detergent component, the Polyox WSR 301, in the concentration range of 100–7000 ppm, to evaluate their influence on pump performances and cavitation. Some properties of the solutions have been preliminary characterized with a rheometer. Then, each solution has been tested in a dedicated test rig, to compare the performance curves of a centrifugal pump used in professional warewashing machines with those obtained with pure water. A non-intrusive method, based on the investigation of high frequency vibrations and noise signals, has been developed to detect cavitation at its early stage of inception. It was observed that polymer mitigates cavitating pump vibrations, with a reduction of the acceleration to less than one g. The analysis has provided the data necessary for the successive development of a control strategy for pump operation in professional appliances.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental analysis of the influence of polymer solutions on performances and cavitation of small size pumps for professional appliances

Burlon

Micheli

Simonato³

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part E:

View full text Add to dashboard Cite

show abstract

“…Drag reduction is defined as a modification to a fluid flow system that results in a decrease in the fluid frictional energy loss [21]. The reduction in hydraulic resistance follows the addition of certain high molecular weight polymers to a liquid flowing along a showed an increase in efficiency and flow rate, and a reduction in power [21,27].…”

Section: Drag Reduction and Polymer Additivesmentioning

confidence: 99%

Pumping Performance Increase Through the Addition of Turbulent Drag-Reducing Polymers to Pulp Fibre Suspensions

AbuYousef

Olson

Martinez

et al. 2010

Volume 7: Fluid Flow, Heat Transfer and Thermal Systems, Parts a and B

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The addition of a small amount of long chain polymers to a turbulent fluid is known to reduce the wall shear stress and drag. Similarly, the addition of pulp fibres to a turbulent suspension is also turbulent-drag reducing despite pulp fibres having a length scale that is 1000 times larger than polymer molecules. The mechanism of drag reduction and its impact on centrifugal pump performance is poorly understood, especially when there is a combination of polymer and fibres in suspension. Centrifugal (slurry) pump performance was measured as a function of pulp fibre and PAM polymer concentration. Both the pump best efficiency and maximum head rise were greater when pumping modest concentrations of polymer solutions and low consistency pulp fibre than pure water. We measured an efficiency increase of 22 percent and a maximum head increase of 4.3 percent with the addition of 150 ppm PAM polymer relative to pure water. We measured an increase of 8 percent and 2.3 percent in pump efficiency and maximum head coefficient, respectively, with 2 percent pulp fibres over that of water alone. With both 1 percent consistency pulp fibres and 100 ppm of PAM polymers, we measured a 12 percent increase in efficiency over that of pulp suspension alone. With both 2 percent consistency pulp fibres and 100 ppm of PAM polymers, we measured an 8 percent increase in efficiency over that of pulp fibre suspension alone. The reasons for the increased pump efficiency with addition of additives is not known but are thought to be due to the turbulent-drag-reducing properties associated with flow of these suspensions.

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Influence of Polymer Solution on Pump Performances

et al. 2017

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In professional warewashing machines, as for example the model of Electrolux Rack Type, the working conditions of the pump are affected by the operating fluid properties, which are different from those of pure water. In fact, the actual trend in this kind of professional appliances is to reduce both energy consumption and time needed for cleaning process: this involves short washing cycles conducted at low temperatures with a solution of water and highly concentrated chemistry. Detergents contain different components and additives, as polymers and surfactants, which can affect the performance of the pump, including cavitation inception conditions. Cavitation leads to flow instabilities, affecting pump performances and inducing an increment in the level of vibrations and noise. While cavitation phenomena in Newtonian fluids is well known, particularly as far as pure water is concerned, in literature there are also various studies on cavitating flows in presence of diluted solutions of polymers additives in water, but only few studies are available regarding the effect of detergent components on pumps cavitation and, in general, on pumps performances. The wide range of variables affecting the phenomenon has led to the development of a laboratory rig for testing centrifugal pumps with aqueous solutions representative of those used in the warewashing sector [1]. This paper presents the results of tests performed with various solutions of a polymer (Polyox WSR301) in water. A rheometric analysis has been previously performed on samples of some of the tested solutions, for characterizing their behavior in terms of both viscosity in laminar conditions and their classification as “diluted” or “concentrated”. For each solution, the resulting performance curves of the pump are then compared with those obtained with pure water

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The effect of polymer additives on the characteristics of a centrifugal pump

Cited by 5 publications

References 0 publications

Experimental analysis of the influence of polymer solutions on performances and cavitation of small size pumps for professional appliances

Experimental analysis of the influence of polymer solutions on performances and cavitation of small size pumps for professional appliances

Pumping Performance Increase Through the Addition of Turbulent Drag-Reducing Polymers to Pulp Fibre Suspensions

Influence of Polymer Solution on Pump Performances

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