CFD Simulation of Critical Sand Deposition Velocity for Solid-Liquid Slurry Flow

2017 ◽  
Author(s):  
Ramin Dabirian ◽  
Ram S. Mohan ◽  
Ovadia Shoham
Keyword(s):  
Cfd Simulation ◽  
Deposition Velocity ◽  
Slurry Flow ◽  
Liquid Slurry ◽  
Solid Liquid ◽  
Sand Deposition

Numerical Simulation and Modeling of Critical Sand-Deposition Velocity for Solid/Liquid Flow

2018 ◽  
Vol 33 (04) ◽  
pp. 866-878 ◽  
Author(s):  
Ramin Dabirian ◽  
Hadi Arabnejad Khanouki ◽  
Ram S. Mohan ◽  
Ovadia Shoham
Keyword(s):  
Numerical Simulation ◽  
Liquid Flow ◽  
Deposition Velocity ◽  
Simulation And Modeling ◽  
Solid Liquid ◽  
Sand Deposition

Effect of Particle Size on Pipeline Flow of Solid-Liquid Slurry With Fixed Particle Size Distribution

2002 ◽  
Author(s):  
P. V. Skudarnov ◽  
M. Daas ◽  
C. X. Lin ◽  
M. A. Ebadian ◽  
P. W. Gibbons ◽  
...  
Keyword(s):  
Particle Size ◽  
Pressure Drop ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Deposition Velocity ◽  
Single Species ◽  
Flow Loop ◽  
Pipeline Flow ◽  
Liquid Slurry ◽  
Solid Liquid

The transport properties of solid-liquid slurries having the same well-defined particle size distribution but different median particle sizes have been studied in a 22-mm I.D. horizontal pipeline flow loop. The solid-liquid slurries were glass beads-water mixtures. The particle size distribution of solids was Rosin-Rammler with median diameters of 50 mm and 250 mm. The relationship between the pressure drop in the straight horizontal sections of the flow loop and the mean slurry velocity was determined for different solids volume concentrations varying from 4.5 to 25% and mean slurry velocity ranging from 0.5 to 2.5 m/s. Critical deposition velocity was measured from visual observations. An existing empirical model of Wasp et al. that predicts the pressure gradient for a single-species slurry flow in a horizontal pipeline was used to describe the pressure drop data. The Oroskar-Turian correlation for critical velocity was used for comparison with the measured critical velocities.

Transport Characteristics of a Multi-Species Slurry in a Horizontal Pipeline

2001 ◽  
Author(s):  
P. V. Skudarnov ◽  
H. J. Kang ◽  
C. X. Lin ◽  
M. A. Ebadian ◽  
P. W. Gibbons ◽  
...  
Keyword(s):  
Pressure Drop ◽  
Deposition Velocity ◽  
Single Species ◽  
Operating Conditions ◽  
High Level Waste ◽  
Slurry Flow ◽  
Flow Loop ◽  
Waste Transfer ◽  
High Level ◽  
Slurry Transport

Abstract In the course of the U.S. Department of Energy’s (DOE) tank waste retrieval, immobilization, and disposal activities, high-level waste transfer lines have the potential to become plugged. In response to DOE’s needs, Florida International University’s Hemispheric Center for Environmental Technology (FIU-HCET) is studying the mechanism and behavior of pipeline plugging to determine the pipeline operating conditions for safe slurry transport. Transport behavior of multi-species slurry has been studied in a 1-in O.D. pipeline flow loop. The slurry was a five-species mixture of Fe2O3, Al2O3, MnO2, Ni2O3, and SiO2, which simulated actual waste at the Savannah River DOE site. The relationship between the pressure drop in the straight horizontal sections of the flow loop and the mean slurry flow velocity was determined for two solids volume concentrations of 5.2 and 7.8%. Critical deposition velocity was measured from visual observations. An existing empirical model that predicts the pressure gradient for a single-species slurry flow in a horizontal pipeline was used to describe the pressure drop data.

scholarly journals Optimization of Centrifugal Slurry Pump Through the Splitter Blades Position

2021 ◽  
Author(s):  
Ehsan Abdolahnejad ◽  
Mahdi Moghimi ◽  
Shahram Derakhshan
Keyword(s):  
Optimal Number ◽  
Centrifugal Pumps ◽  
Slurry Flow ◽  
Suction Surface ◽  
Two Phase ◽  
Flow Rates ◽  
Simulation Tools ◽  
Slip Factor ◽  
Pump Head ◽  
Solid Liquid

Abstract Optimal transfer of two-phase solid-liquid flow (slurry flow) has long been a major industrial challenge. Slurry pumps are among the most common types of centrifugal pumps used to deal with this transfer issue. The approach of improving slurry pumps and consequently increasing the efficiency of a flow transmission system requires overcoming the effects of slurry flow such as the reduction in head, efficiency, and wear. This study attempts to investigate the changes in the pump head by modifying the slip factor distribution in the impeller channel. For this purpose, the effect of splitter blades on slip factor distribution to improve the pump head was investigated using numerical simulation tools and validated based on experimental test data. Next, an optimization process was used to determine the characteristics of the splitter (i.e., length, number, and environmental position of the splitter) based on a combination of experimental design methods, surface response, and genetic algorithm. The optimization results indicate that the splitters were in a relative circumferential position of 67.2% to the suction surface of the main blade. Also, the optimal number and length of splitter blades were 6 and 62.8% of the length of the main blades, respectively. Because of adding splitter blades and the reduction in the flow passage, the best efficiency point (BEP) of the slurry pump moved toward lower flow rates. The result of splitter optimization was the increase in pump head from 29.7 m to 31.7 m and the upkeep of efficiency in the initial values.

CFD simulation of liquid-phase mixing in solid–liquid stirred reactor

2008 ◽  
Vol 63 (15) ◽  
pp. 3877-3885 ◽  
Author(s):  
G.R. Kasat ◽  
A.R. Khopkar ◽  
V.V. Ranade ◽  
A.B. Pandit
Keyword(s):  
Liquid Phase ◽  
Cfd Simulation ◽  
Phase Mixing ◽  
Stirred Reactor ◽  
Solid Liquid

Investigation of Critical Sand-Deposition Velocity in Horizontal Gas/Liquid Stratified Flow

2017 ◽  
Vol 32 (03) ◽  
pp. 218-227 ◽  
Author(s):  
Roberto Ibarra ◽  
Ram S. Mohan ◽  
Ovadia Shoham
Keyword(s):  
Deposition Velocity ◽  
Stratified Flow ◽  
Sand Deposition

Sand Transport in Slightly Upward Inclined Multiphase Flow

2018 ◽  
Vol 140 (7) ◽  
Author(s):  
Ramin Dabirian ◽  
Ram Mohan ◽  
Ovadia Shoham ◽  
Gene Kouba
Keyword(s):  
Flow Regime ◽  
Water Flow ◽  
Deposition Velocity ◽  
Stratified Flow ◽  
Flow Regimes ◽  
Test Facility ◽  
Sand Transport ◽  
Deposition Condition ◽  
Sand Flow ◽  
Sand Deposition

In order to assess the critical sand deposition condition, a unique 4-in ID test facility was designed and constructed, which enables the pipe to be inclined 1.5 deg upward. Experiments were conducted with air–water-glass beads at low sand concentrations (< 10,000 ppm), and the air and water flow rates were selected to ensure stratified flow regime along the pipe. At constant superficial liquid velocity, the gas velocity was reduced to find the critical sand deposition velocity. Six sand flow regimes are identified, namely, fully dispersed solid flow, dilute solids at the wall, concentrated solids at the wall, moving dunes, stationary dunes, and stationary bed. The experimental results reveal that sand flow regimes under air–water stratified flow are strong functions of phase velocities, particle size, and particle concentration. Also, the results show that air–water flow regime plays an important role in particle transport; slug flow has high capability to transport particles at the pipe bottom, while the stratified flow has high risk of sand deposition. As long as the sand dunes are observed at the pipe bottom, the critical sand deposition velocities slightly increase with concentrations, while for stationary bed, the critical velocity increases exponentially with concentration.

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