Slip Factors of Centrifugal Slurry Pumps

1987 ◽  
Vol 109 (3) ◽  
pp. 313-318 ◽  
Author(s):  
K. K. Sheth ◽  
G. L. Morrison ◽  
W. W. Peng
Keyword(s):  
Flow Rate ◽  
Glass Bead ◽  
Power Flow ◽  
Mixture Density ◽  
Slip Factor ◽  
Friction Factors ◽  
Through Flow ◽  
Data Correlations ◽  
Power Measurements ◽  
Made In

Experiments have been carried out in order to determine the effects on slip factor due to the various parameters affecting the performance characteristics of a centrifugal slurry pump. The experiments were conducted with water, sand slurry, and a glass bead slurry at three different pump speeds. Measurements of power, flow rate, head developed by the pump and the density of the slurry were made in order to obtain the characteristic curves of the pump. Using Euler’s equation, equations were derived for calculating the slip and friction factors of the flow. The deduced slip factors for centrifugal slurry pump can be correlated well with suggested non dimensional groups. It shows a consistent trend of decreasing slip factor with increasing slurry mixture density and impeller rotation, or with a decreasing through flow rate. The sizes of the sand and glass bead particles are significantly different (0.71 mm versus 0.09 mm), however, the data correlations do not suggest its effect on the slip factors significantly as the other parameters. The slip factors deduced from head-flow rate curves are more reliable than those deduced from power-flow rate curves, since the shut-off power measurements are likely subjected to errors associated with the particles settling, or the transient effect if the measurements are taken momentarily.

scholarly journals Travel Time Model of Left-Turning Vehicles at Signalized Intersection

2012 ◽  
Vol 2012 ◽  
pp. 1-10 ◽  
Author(s):  
Leng Jun-qiang ◽  
Feng Yu-qin ◽  
Zhai Jing ◽  
Bao Lei ◽  
He Yi
Keyword(s):  
Travel Time ◽  
Flow Rate ◽  
Signalized Intersection ◽  
Time Model ◽  
Through Flow ◽  
Negative Exponential Distribution ◽  
The Common ◽  
Queue Theory ◽  
Negative Exponential ◽  
The Impact

The travel time of left-turning vehicles at signalized intersection was discussed. Under the assumption that the opposing through vehicles headway follows M3 distribution, the travel time model was established on the basis of gap theory and queue theory. Comparison was done with the common model based on the assumption that the opposing through vehicles headway follows negative exponential distribution. The results show that the model in this paper has stronger applicability and its most relative error is less than 15%. In addition, the sensitivity analysis was done. The results show that the opposing through flow rate has significant impact on travel time. The impact of left-turning flow rate and following headway is light when the opposing through flow rate is small, the threshold is about 0.18 veh/s. The model established in this paper can well calculate travel time of left-turning vehicles at intersection, and the methodology may provide reference to other occasions.

Air Sparging for Mixing Non-Newtonian Slurries

2010 ◽  
Author(s):  
Judith Ann Bamberger ◽  
Carl W. Enderlin ◽  
S. Tzemos
Keyword(s):  
Flow Regime ◽  
Flow Rate ◽  
Air Flow ◽  
Newtonian Fluids ◽  
Air Sparging ◽  
Air Bubbles ◽  
Air Flow Rate ◽  
Primary Flow ◽  
Zone Of Influence ◽  
Made In

The mechanics of air sparger systems have been primarily investigated for aqueous-based Newtonian fluids. Tilton et al. (1982) [1] describes the fluid mechanics of air sparging systems in non-Newtonian fluids as having two primary flow regions. A center region surrounding the sparger, referred to as the region of bubbles (ROB), contains upward flow due to the buoyant driving force of the rising bubbles. In an annular region, outside the ROB, referred to as the zone of influence (ZOI), the fluid flow is reversed and is opposed to the direction of bubble rise. Outside the ZOI the fluid is unaffected by the air sparger system. The flow regime in the ROB is often turbulent, and the flow regime in the ZOI is laminar; the flow regime outside the ZOI is quiescent. Tests conducted with shear thinning non-Newtonian fluid in a 34-in. diameter tank showed that the ROB forms an approximately inverted cone that is the envelop of the bubble trajectories. The depth to which the air bubbles reach below the sparger nozzle is a linear function of the air-flow rate. The recirculation time through the ZOI was found to vary proportionally with the inverse square of the sparging air-flow rate. Visual observations of the ROB were made in both water and Carbopol®. The bubbles released from the sparge tube in Carbopol® were larger than those in water.

The Slip Factor of a Radial Bladed Centrifugal Compressor

1965 ◽  
Vol 87 (2) ◽  
pp. 181-188 ◽  
Author(s):  
Alfred F. Stahler
Keyword(s):  
Flow Rate ◽  
Centrifugal Compressor ◽  
Rotational Speed ◽  
Gas Flow ◽  
Centrifugal Impeller ◽  
Gas Flow Rate ◽  
Slip Factor ◽  
Impeller Geometry

Several of the methods of explaining and evaluating the slip factor of a centrifugal impeller with straight radial blades are presented. The slip factors are calculated by these methods and compared to the experimentally observed characteristics of an impeller with 19 blades. It is shown that the slip factor depends on the gas-flow rate, the rotational speed, and the impeller-tip diameter. It is concluded that the slip-factor characteristics are better described by means of a constant leaving angle of the flow relative to the impeller and that the leaving angle is only a function of the impeller geometry.

scholarly journals Investigation on separation performance of vane-type gas-liquid tube separator

2020 ◽  
Vol 26 (3) ◽  
pp. 227-236 ◽  
Author(s):  
Jun Niu ◽  
Shuo Liu ◽  
Jing-Yu Xu
Keyword(s):  
Numerical Simulation ◽  
Flow Rate ◽  
Electrical Resistance ◽  
Phase Distribution ◽  
Separation Efficiency ◽  
Separation Performance ◽  
Multiphase Model ◽  
Electrical Resistance Tomography ◽  
Mixture Density ◽  
Liquid Separator

In this work, gas phase distribution characteristic and separation performance of a new vane-type gas-liquid separator were carefully investigated using electrical resistance tomography and numerical simulation. The diameter of the separator was 100 mm and the flow rate ranges from 12.0 to 23.0 m3/h. The gas flow rate ranges from 1.2 to 4.0 m3/h. In the experiment, electrical resistance tomography was applied to test section void fraction distribution. Coriolis mass flow meter was applied to obtain separation efficiency by testing separator exits mixture density. In the numerical simulation, full Eulerian multiphase model, together with RNG k-? turbulent model and dispersed phase zero equation models were applied. Results show that the vane-type gas-liquid separator's performance is influenced by gas core size. The separator performs well in all the cases, considering separation efficiency is over 85%, and achieves nearly 100% through adjustment of split ratio. All these findings are beneficial for vane-type gas-liquid separator design and optimization.

scholarly journals Green methods for methyl esters determination in foodstuffs

2013 ◽  
Author(s):  
Lucyna Marta Lekawska-Andrinopoulou
Keyword(s):  
Methyl Ester ◽  
Flow Rate ◽  
Methyl Esters ◽  
Alcohol Oxidase ◽  
Pectin Methylesterase ◽  
Enzymatic Reactions ◽  
Automated Method ◽  
Chemiluminescent Detection ◽  
Through Flow ◽  
Diet Drinks

In this thesis development of novel, green methods for methyl esters in foodstuffs is described. Methods are based on enzymatic reactions and fluidics. Study focuses on two methyl esters: pectin methyl ester and aspartame, a methyl ester of aspartic acid/phenylalanine dipeptide. Pectin and aspartame are enzymatically hydrolysed by pectin methylesterase or _- chymotrypsin, respectively. Methanol is released and quantified. Several methanol determination methods have been tested, with the method with 4-AAP and phenol showing the best prospects for automation. Method was optimized and its robustness was investigated. Ascorbic acid interference removal with 4-hydroxy TEMPO was tested. Development of two automated methods for methyl esters determination is described: spectrophotometric pectin methyl esters determination and chemiluminescent aspartame determination.The method for pectin methyl esters is the first work on pectin analysis through flow injection. Detection limit down to 1.47 mM was achieved at the analysis rate of 7 samples h-1. The method provides identical results with manual off-line method. The development of the aspartame analyzer was preceded by the development of a spectrophotometric method, which showed good results in samples containing higher aspartame concentrations than expected in beverages. In order to improve method for possible application in beverages chemiluminescent detection was selected for the automated method. The chemistry from kinetic study was modified to accommodate luminol chemiluminescent detection and optimization of the system was performed. Several manifolds were constructed and the effect of following parameters was tested: flow rate, mixing coils length, location and number, preincubation time, alcohol oxidase concentration, use of separate solutions of AOX and HRP. 0.8 ml/min/line flow rate in combination with one 100 cm mixing coil, 60 s preincubation and use of separated solutions of AOX an HRP resulted in sufficient sensitivity that allowed for construction of a calibration curve within the range of aspartame concentration found in diet drinks. Additionally, following side projects related to the main topic of the study are described: development of PME activity assay and galacturonic acid determination.

Calculation of Fluid Motion in Axial Flow Turbomachines

1968 ◽  
Author(s):  
D. J. L. Smith ◽  
J. F. Barnes
Keyword(s):  
Experimental Work ◽  
Fluid Motion ◽  
Three Dimensional ◽  
Axial Compressor ◽  
Axial Flow ◽  
Streamline Curvature ◽  
Through Flow ◽  
Loss Distributions ◽  
The Matrix ◽  
Made In

In the last few years considerable progress has been made in calculating the three-dimensional flows through turbomachines. The two methods which appear to be widely used are what have come to be known as the “Streamline Curvature” and the “Matrix Through Flow” methods. At the National Gas Turbine Establishment, these advanced methods have been applied to existing turbomachines and this paper presents some of the calculated and experimental results for four axial flow machines. By making use of fairly simple loss distributions it has been found that these methods can assist towards the understanding of observed phenomena and, in the case of the axial compressor, they offer some prospect of being able to calculate the onset of surge. Also included is a brief report of work in progress to generate a computer program for the solution of the compressible velocity distribution around the surfaces of turbomachine blades, together with an indication of possible future experimental work.

Experimental Results from Physical Model of Bidirectional Power Flow Regulator for Power Substations of Electrical Transport

2009 ◽  
Vol 25 (25) ◽  
pp. 127-132
Author(s):  
Aigars Vitols ◽  
Ivars Rankis
Keyword(s):  
Physical Model ◽  
Electrical Transport ◽  
Power Flow ◽  
Experimental Results ◽  
Principal Block ◽  
Block Scheme ◽  
Flow Regulator ◽  
Bidirectional Power Flow ◽  
Made In ◽  
Power Substations

Experimental Results from Physical Model of Bidirectional Power Flow Regulator for Power Substations of Electrical TransportThis article is about model of bidirectional power flow regulator for power substations of electrical transport. The paper presents an experimental model which is made in the laboratory of Power and electrical engineering of Riga Technical University. Also principal block scheme and principal schemes of that model are presented in the form of computer modeling as well as some main results of experiments are presented in the form of diagrams.

Diffusion Flame of Propane in a Weak Electric Field

2012 ◽  
Vol 7 (3) ◽  
pp. 62-66
Author(s):  
Oleg Ganeev ◽  
Vladimir Zudov ◽  
Pavel Tretyakov ◽  
Andrey Tupikin
Keyword(s):  
Experimental Research ◽  
Flow Rate ◽  
Diffusion Flame ◽  
Weak Electric Field ◽  
Diffusion Combustion ◽  
Electrical Field ◽  
Electrical Fields ◽  
Effective Remedy ◽  
Large Flow ◽  
Made In

Now burning fuel in technological devices is made in a diffusion condition. To one of problems remains to stabilization of a flame at large flow rate of air. The affecting of electrical fields is an effective remedy of control of a flame since at a band of a response there is an ionised medium. Field imposing on combustion can improve conditions of a regulation substantially. In a job results of an experimental research of influence of a weak electrical field on diffusion combustion of the propane, including in the presence of coflow are presented. Influence of a field on integrated performances of a flame is viewed: altitude of a lifting, a condition and stabilization modes

Using a Multiport Pitot Tube in Circulating Water Flow Measurements

2007 ◽  
Author(s):  
Luis R. Figueroa Ibarra ◽  
J. Hugo Rodri´guez Marti´nez ◽  
Marcelino Santaba´rbara Botello
Keyword(s):  
Water Flow ◽  
Flow Rate ◽  
Cooling System ◽  
Thermal Power ◽  
Water Flow Rate ◽  
Pitot Tube ◽  
Flow Measurements ◽  
Circulating Water ◽  
Measurement Results ◽  
Made In

This paper details the design of a Pitot tube used for water flow rate measurements in large pipes. The paper describes first the nowadays commonly used device (simplex pitot), based on standard CTI Code ATC-105 from Cooling Tower Institute [1]. The disadvantages of the simplex pitot are pointed out, and the detailed description of the proposed device (multiport pitot) is explained. The Multiport Pitot, which design is also based on norm ATC-105, is able to perform real-time measurements. The paper also includes the results obtained from the water flow rate measurements made in the cooling system of a thermal power plant in Mexico. These measurement results were compared to simulation results obtained with a computational commercial simulation tool.

Sign in / Sign up

Export Citation Format

Share Document