GENERAL STAGE–DISCHARGE RELATIONSHIP FOR SHARP‐CRESTED POWER‐LAW WEIRS: ANALYTICAL AND EXPERIMENTAL STUDY

2019 ◽  
Vol 68 (4) ◽  
pp. 808-821
Author(s):  
Ali R. Vatankhah ◽  
M. Khamisabadi
Keyword(s):  
Experimental Study ◽  
Power Law ◽  
General Stage

Settling behavior of non-spherical particles in power-law fluids: Experimental study and model development

Particuology ◽  
2019 ◽  
Vol 46 ◽  
pp. 30-39 ◽  
Author(s):  
Zhengming Xu ◽  
Xianzhi Song ◽  
Gensheng Li ◽  
Zhaoyu Pang ◽  
Zhaopeng Zhu
Keyword(s):  
Experimental Study ◽  
Power Law ◽  
Model Development ◽  
Spherical Particles ◽  
Power Law Fluids ◽  
Settling Behavior

Flow of Yield Power Law Fluids in Horizontal Pipes-Flow Field Characterization Using Particle Image Velocimetry Technique

2021 ◽  
Author(s):  
Yanxin (Sussi) Sun ◽  
Abdulla Abou-Kassem ◽  
Majid Bizhani ◽  
Ergun Kuru
Keyword(s):  
Experimental Study ◽  
Flow Field ◽  
Velocity Profile ◽  
Yield Stress ◽  
Power Law ◽  
Pipe Flow ◽  
Hydrodynamic Behaviour ◽  
Yield Stress Fluids ◽  
Power Law Fluids ◽  
Flow Field Characteristics

Abstract Yield Power Law (YPL) rheological model is commonly used to describe the pipe and annular flow of drilling fluids. However, the hydrodynamic behaviour of fluids with yield stress are difficult to predict because they exhibit an inherent plug (solid like) region where the velocity gradient is zero. Moreover, it is not easy to identify the transition between this solid like and liquid regions. Theoretical studies have been conducted in the past to describe YPL fluid flow in pipes and annuli. As a result, several models have been proposed for determining flow field characteristics (e.g. velocity profile, plug width, etc.) and frictional pressure losses. However, most of these models have been validated by limited experimental and/or field data. Similar future modeling studies may benefit from more data collected under controlled experimental conditions. Therefore, we have conducted an experimental study to investigate the hydrodynamic behaviour of yield stress fluids under laminar pipe flow conditions and the results are presented in this paper. Water-based Yield Power Law fluids were prepared by using Carbopol® 940, a synthetic high-molecular-weight polyacrylic acid-based cross-linked polymer. Fluids with yield stresses varying from 0.75 Pa (1.56 lb/100 ft2) to 4.37 Pa (9.13 lb/100 ft2) were obtained by using Carbopol concentrations changing from 0.060% w/w to 0.073% w/w. A 9m long horizontal pipeline with, 95 mm diameter (ID) was used for the experiments. Reynolds number range varying from 97 to 1268 confirmed that all flow field characteristics measurements of YPL fluids were conducted under laminar flow regimes. Experimental study provided detailed information about pipe flow characteristics of yield stress fluids, including full annular velocity profile, near wall velocity profile, wall slip velocity and the plug region thickness. The study was concluded by comparing experimental results (i.e. full velocity profile, frictional pressure loss, and plug width) to predictions of models presented in the literature. Practical implications of the results have also been discussed by considering the hydraulic design of some practical field operations such as hole cleaning.

scholarly journals The Power Law Characteristics of Stock Price Jump Intervals: An Empirical and Computational Experimental Study

Entropy ◽  
2018 ◽  
Vol 20 (4) ◽  
pp. 304 ◽  
Author(s):  
Hongduo Cao ◽  
Hui Ouyang ◽  
Ying Li ◽  
Xiaobin Li ◽  
Ye Chen
Keyword(s):  
Experimental Study ◽  
Power Law ◽  
Stock Price

Experimental Study and Numerical Simulation on the Blistering Defect during Thixocasting

2014 ◽  
Vol 217-218 ◽  
pp. 144-150
Author(s):  
Xiao Gang Hu ◽  
Fan Zhang ◽  
You Feng He ◽  
Stephen Midson ◽  
Qiang Zhu
Keyword(s):  
Numerical Simulation ◽  
Experimental Study ◽  
Shear Rate ◽  
Power Law ◽  
Process Simulation ◽  
Surface Defects ◽  
Solution Treatment ◽  
Filling Process ◽  
Carreau Model ◽  
Rate Range

Blistering is one of the main surface defects of thixocasting parts after solution treatment. In this paper, experimental study about the influence of plunger velocity on blistering problem was carried out, and the blistering level with various velocities was discussed. In addition, a series of simulation work for filling process were performed to analyse the formation mechanism of blister. The results indicate that the power law cut-off model can reflect the thixotropic characteristics better at shear rate range from 100s-1to 500s-1than Carreau model. Based on power law cut-off (PLCO) model, the filling process simulation reveals the air entrapments were caused by poor venting instead of turbulence, either decreasing the filling speed or modification of the die venting system would improve blistering problem.

Experimental study on the wall factor for spherical particles settling in parallel plates filled with power-law fluids

2019 ◽  
Vol 179 ◽  
pp. 941-947 ◽  
Author(s):  
Xianzhi Song ◽  
Zhaopeng Zhu ◽  
Zhengming Xu ◽  
Gensheng Li ◽  
Matsimbe Atanasio Faustino ◽  
...  
Keyword(s):  
Experimental Study ◽  
Power Law ◽  
Spherical Particles ◽  
Parallel Plates ◽  
Power Law Fluids

Investigation of the Nuclear Stopping Mechanism by Heavy Particle Range Measurements in Isotopic Media

1971 ◽  
Vol 49 (16) ◽  
pp. 2106-2117 ◽  
Author(s):  
J. Leon ◽  
N. H. Steiger-Shafrir
Keyword(s):  
Experimental Study ◽  
Isotope Effect ◽  
High Precision ◽  
Power Law ◽  
Heavy Particle ◽  
Heavy Isotope ◽  
Nuclear Stopping ◽  
Range Measurements ◽  
Thomas Fermi ◽  
Mass Ratios

An experimental study of the nuclear stopping mechanism has been carried out by performing high precision range and range straggling measurements of 96.5 keV 224Ra α-disintegration recoil particles in the following isotopic gases: H2/D2/T2,3He/4He, 14N2/15N2,16O2/18O2, and 20Ne/22Ne. Distinct range differences for light to heavy isotope mass ratios up to about 0.9 were determined. The results obtained establish clearly that the prediction of the isotope effect of the stopping medium, as derived from the Lindhard theory by using the power law potential as an approximation to the Thomas–Fermi potential, is to a good degree of accuracy, confirmed by experiment.

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