A correlation to predict the performance characteristics of centrifugal pumps handling slurries

1997 ◽  
Vol 211 (2) ◽  
pp. 147-157 ◽  
Author(s):  
K A Kazim ◽  
B Maiti ◽  
P Chand
Keyword(s):  
Experimental Data ◽  
Particle Size ◽  
Suspended Solids ◽  
Reduction Factor ◽  
Performance Characteristics ◽  
Centrifugal Pumps ◽  
Pump Performance ◽  
New Correlation ◽  
Effect Of Particle Size ◽  
The Individual

Centrifugal pumps are being used increasingly for transportation of slurries through pipelines. To design a slurry handling system it is essential to have a knowledge of the effects of suspended solids on the pump performance. A new correlation to predict the head reduction factor for centrifugal pumps handling solids has been developed. This correlation takes into account the individual effect of particle size, particle size distribution, specific gravity and concentration of solids on the centrifugal pump performance characteristics. The range of validity of the correlation has been verified by experiment and by using experimental data available from the literature. The present correlation shows better agreement with the experimental data than existing correlations.

Effect of Density, Size Distribution, and Concentration of Solid on the Characteristics of Centrifugal Pumps

1992 ◽  
Vol 114 (3) ◽  
pp. 386-389 ◽  
Author(s):  
V. K. Gahlot ◽  
V. Seshadri ◽  
R. C. Malhotra
Keyword(s):  
Experimental Data ◽  
Size Distribution ◽  
Empirical Relationship ◽  
Maximum Size ◽  
Centrifugal Pumps ◽  
Pump Performance ◽  
Size Of Particles

Experimental data on the performance of the centrifugal pumps pumping mixtures of solids and water have been presented. The solids used were coal of density 1480 kg/m3 and zinc tailings of density 2850 kg/m3. Maximum size of particles was approximately 3 mm. Tests have been conducted with a rubber lined impeller pump and a metal impeller pump. Effects of solid properties (viz: density, size, and size distribution as well as concentration of solids) on the performance of the pumps have been studied. The measured performance of pumps is compared with the predictions based on the correlations available in literature and a modified empirical relationship has been proposed for the prediction of the pump performance with slurries.

The apparent digestibility of maize grain when given in various physical forms to adult sheep and cattle

1973 ◽  
Vol 80 (2) ◽  
pp. 259-267 ◽  
Author(s):  
G. F. Wilson ◽  
N. N. Adeeb ◽  
R. C. Campling
Keyword(s):  
Particle Size ◽  
Apparent Digestibility ◽  
Individual Animal ◽  
High Moisture ◽  
Lactating Cows ◽  
Effect Of Particle Size ◽  
Maize Grain ◽  
The Individual ◽  
Maize Kernels ◽  
Male Sheep

SummaryA series of digestibility trials was conducted with non-lactating cows and adult castrated male sheep given diets of hay and dried or high-moisture maize grain in various physical forms. Sheep were able to digest all forms of maize well and to a greater extent than cows. In cows considerable variation in digestibility of maize was associated with the particle size of the maize and the individual animal. Maximum digestibility of dried maize in cows ensued when the modulus of fineness lay within the range 4·7–3·0 and with high moisture maize from 5·4 to 5·1. A study was made of the effect of particle size on the rate of digestion of maize suspended in nylon bags in the rumen. Evidence was presented showing the importance of rumination in ensuring the digestion of intact kernels. Possible causes of differences between cows in their ability to digest intact maize kernels are discussed.

Comparative Evaluation of Some Existing Correlations to Predict Head Degradation of Centrifugal Slurry Pumps

2003 ◽  
Vol 125 (1) ◽  
pp. 149-157 ◽  
Author(s):  
Tahsin Engin ◽  
Mesut Gur
Keyword(s):  
Comparative Evaluation ◽  
Reduction Factor ◽  
Mean Deviation ◽  
Published Data ◽  
Centrifugal Pumps ◽  
Efficiency Ratio ◽  
Know How ◽  
New Correlation ◽  
Data Points ◽  
The Mean

In order to optimally design a slurry transportation system, it is necessary to know how the presence of solids will change the performance of the slurry pump to be installed. This paper makes the comparison of some existing correlations available in the literature to predict the head reduction factors of such centrifugal pumps handling slurries. For this purpose, a large number of published data for various centrifugal slurry pump tests in the literature have been used to develop a new correlation and then this correlation and all others have been tested against the data. For the proposed correlation, the mean and average deviations between the calculated and measured head reduction factor is 8.378 and 0.620%, respectively, for all data of mostly handling commercial slurries. It also produces 12.441% mean deviation in the prediction of efficiency ratio for 216 data points. Overall, the new correlation that can be applied to both metal and rubber lined pumps with impeller diameter up to 850 mm, gives remarkably closer fit to the published data of both head and efficiency ratios than all existing correlations.

Performance Characteristics of Centrifugal Pumps When Handling Non-Newtonian Homogeneous Slurries

1984 ◽  
Vol 198 (1) ◽  
pp. 41-49 ◽  
Author(s):  
C I Walker ◽  
A Goulas
Keyword(s):  
Reynolds Number ◽  
Rheological Properties ◽  
Performance Characteristics ◽  
Pump Efficiency ◽  
Homogeneous Type ◽  
Centrifugal Pumps ◽  
Large Drop ◽  
Pump Performance ◽  
Water Characteristics ◽  
Test Loop

The change in performance characteristics of centrifugal pumps when handling fine granular or homogeneous type non-Newtonian slurries has been investigated using two different slurry pumps handling mixtures of coal/water and kaolin/water. A test loop was used which allowed pump performance to be determined at various pump speeds, with many different mixture concentrations and rheologies. The test work indicated two main changes in the pump performance compared to the water characteristics: (i) a large drop in pump developed head at low flowrates (creating an unstable curve), and; (ii) a reduction in the pump efficiency at flowrates near the best efficiency point. The results show that the pump performance is dependent on the slurry's rheological properties, with pump Reynolds number giving generally good correlation with the change in performance. Methods of performance correlation used for Newtonian fluids were found to give good results provided that a suitable value for the viscosity could be chosen.

Performance Characteristics of a Centrifugal Pump Impeller With Running Tip Clearance Pumping Solid-Liquid Mixtures

2001 ◽  
Vol 123 (3) ◽  
pp. 532-538 ◽  
Author(s):  
Tahsin Engin ◽  
Mesut Gur
Keyword(s):  
Centrifugal Pump ◽  
Liquid Mixtures ◽  
Reduction Factor ◽  
Tip Clearance ◽  
Performance Characteristics ◽  
Solid Concentration ◽  
Centrifugal Pumps ◽  
Pump Impeller ◽  
Solid Liquid ◽  
Centrifugal Pump Impeller

This paper presents extensive results on the performance of an unshrouded centrifugal pump impeller handling solid-liquid mixtures. The effect of the clearance between the impeller tip and the casing and of the solid concentration, density and mean diameter on the pump performance characteristics is investigated. The results are discussed and utilized, together with data available in the literature, to establish a correlation allowing the prediction of the head reduction factor for shrouded/unshrouded impeller centrifugal pumps handling solid-liquid mixtures. The predictions made with the proposed correlation show a better agreement with experimental results than previous ones.

scholarly journals Modelling The Effects of Aggregate Size on Alkali Aggregate Reaction Expansion

2014 ◽  
Vol 4 (3) ◽  
pp. 656-661
Author(s):  
N. Z. Sekrane ◽  
A. Asroun
Keyword(s):  
Experimental Data ◽  
Particle Size ◽  
Aggregate Size ◽  
Small Particles ◽  
Alkali Aggregate Reaction ◽  
Siliceous Limestone ◽  
Effect Of Particle Size ◽  
Porous Zone

This work aims at developing models to predict the potential expansion of concrete containing alkali-reactive aggregates. The paper gives measurements in order to provide experimental data concerning the effect of particle size of an alkali-reactive siliceous limestone on mortar expansion. Results show that no expansion was measured on the mortars using small particles (0.5-1.0 mm) while the particles (1.0–2.0 mm) gave the largest expansions (0.217%). Two models are proposed, the first one studies the correlations between the measured expansions and the size of aggregates, the second one calculates the thickness of the porous zone necessary to take again all the volume of the gel created.

scholarly journals Analysis of Performance Characteristics Predicted From Several Experimental Data and Conversion Methods for Pumps as Turbine Application Using Statistical Techniques

2020 ◽  
Vol 39 (2) ◽  
pp. 213-226
Author(s):  
Ombeni Mdee ◽  
Cuthbert Kimambo ◽  
Torbjorn Nielsen ◽  
Joseph Kihedu
Keyword(s):  
Experimental Data ◽  
Flow Rate ◽  
Performance Characteristics ◽  
Hydropower Plant ◽  
Rate Coefficients ◽  
Reverse Direction ◽  
Centrifugal Pumps ◽  
Pump Mode ◽  
Reverse Mode ◽  
Specific Speed

Different performance characteristics have been indicated when running centrifugal pumps in the reverse direction. The water flows from the discharge side of the pump to the suction side to run in the reverse direction and generate the mechanical rotational energy for the micro-hydropower plant. The current study evaluates the extent of variation of performance characteristics predicted by several experimental data from different pump-specific speeds and conversion methods. The performance characteristics discussed include the head, flow rate, efficiency and specific speed. The flow rate and head of a pump operating in pump mode divided with the characteristic of the pump operating in the reverse mode, at the best efficiency point, the resulting coefficient of determination (R 2 ) values were of 0.890 and 0.708, respectively. Also, the graph of head versus flow rate coefficients, which is a second- order polynomial function, has shown the value of R 2 of 0.954 for pump-specific speed ranging between 9 and 94 rpm. However, the pump in the reverse mode has smaller performance characteristics for efficiency and specific speed compared to the pump mode operation with R 2 of 0.966 and 0.999, respectively. Furthermore, schematic empirical statistical models were developed to predict the performance characteristics of several conversion methods using pump data obtained from the manufacturers.

Evaluation of the Effect of Particle Size on Erosion Calculations Utilizing CFD and Comparison With Submerged Slurry Jet Experiments

2019 ◽  
Author(s):  
Soroor Karimi ◽  
Jun Zhang ◽  
Siamack A. Shirazi ◽  
Brenton S. McLaury
Keyword(s):  
Experimental Data ◽  
Particle Size ◽  
Jet Impingement ◽  
Computational Procedure ◽  
Particle Sizes ◽  
Grid Spacing ◽  
Concentration Effects ◽  
Erosion Models ◽  
Effect Of Particle Size ◽  
Corrosion Research

Abstract The effects of particle size on erosion magnitude and erosion profiles are investigated experimentally in a submerged slurry jet impingement facility. The slurries were diluted to avoid concentration effects on the flow field and the resulting erosion. The experiments are performed with particle sizes of 25, 75, 150, 300, and 600 μm. Experimental results demonstrate different erosion severity and pattern for the various particle sizes. It is critical to have a reliable and accurate tool to predict erosion for different particle sizes. Previously, a comprehensive CFD-based procedure to predict erosion for various particle sizes was proposed by investigators at the Erosion/Corrosion Research Center (E/CRC). A feature of this procedure is that it can account for particle size in more detail than previous methods. In this study, the computational procedure is applied to conditions of the present experimental data. Particle impact parameters are extracted to explain the effect of particle size on the resulting erosion. The predicted results are compared with data which demonstrate possible shortcomings of the available CFD based techniques for predicting solid particle erosion. The results indicate that with proper use of grid spacing near the wall, the CFD-based erosion calculation method with existing erosion models can predict the trend of the experimental data, though improvements are still needed to the models to accurately account for particle size effects.

Effect of particle size on erosion measurements and predictions in annular flow for an elbow

Wear ◽  
2020 ◽  
pp. 203579
Author(s):  
G. Haider ◽  
M. Othayq ◽  
J. Zhang ◽  
R.E. Vieira ◽  
S.A. Shirazi
Keyword(s):  
Particle Size ◽  
Annular Flow ◽  
Effect Of Particle Size
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