Experimental study and numerical modeling of mixing by air injection in yield stress fluids using the OpenFOAM software

AIChE Journal ◽  
2021 ◽  
Author(s):  
Ali Hojeij ◽  
Laurent Jossic ◽  
Philippe Séchet ◽  
Cyrille Bonamy ◽  
Albert Magnin ◽  
...  
Keyword(s):  
Experimental Study ◽  
Numerical Modeling ◽  
Yield Stress ◽  
Air Injection ◽  
Yield Stress Fluids

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.

Numerical Modeling and Experimental Study of Laser Assisted Machining of Fused Silica

Silicon ◽  
2021 ◽  
Author(s):  
Huawei Song ◽  
Pengfei Pan ◽  
Kaihua Xu ◽  
Yuping Zhang ◽  
Zhengxin Yang ◽  
...  
Keyword(s):  
Experimental Study ◽  
Numerical Modeling ◽  
Fused Silica ◽  
Laser Assisted Machining

Piezoelectric Micromirrors with Geometric and Material Nonlinearities: Experimental Study and Numerical Modeling

2020 ◽  
Author(s):  
Andrea Opreni ◽  
Attilio Frangi ◽  
Nicolo Boni ◽  
Gianluca Mendicino ◽  
Massimiliano Merli ◽  
...  
Keyword(s):  
Experimental Study ◽  
Numerical Modeling

Multi-layer channel flows with yield stress fluids

2011 ◽  
Vol 166 (5-6) ◽  
pp. 262-278 ◽  
Author(s):  
S. Hormozi ◽  
K. Wielage-Burchard ◽  
I.A. Frigaard
Keyword(s):  
Yield Stress ◽  
Channel Flows ◽  
Yield Stress Fluids

Gas mixing in a multi-stage conversion fluidized bed (MFB) with secondary air injection. Part I: an experimental study

RSC Advances ◽  
2016 ◽  
Vol 6 (43) ◽  
pp. 36642-36655 ◽  
Author(s):  
Rong Zhang ◽  
Zhenhua Hao ◽  
Zhiyu Wang ◽  
Xiaodong Huo ◽  
Junguo Li ◽  
...  
Keyword(s):  
Experimental Study ◽  
Fluidized Bed ◽  
Air Injection ◽  
Gas Mixing ◽  
Cold Model ◽  
Stage Conversion ◽  
Multi Stage ◽  
Secondary Air Injection ◽  
Secondary Air

This paper investigated the distribution of secondary air after injection into a multi-stage conversion fluidized bed (MFB) cold model.

A modern look on yield stress fluids

2016 ◽  
Vol 56 (3) ◽  
pp. 177-188 ◽  
Author(s):  
Alexander Malkin ◽  
Valery Kulichikhin ◽  
Sergey Ilyin
Keyword(s):  
Yield Stress ◽  
Yield Stress Fluids

Estimation of Rate of Strain Magnitude and Average Viscosity in Turbulent Flow of Shear Thinning and Yield Stress Fluids

2010 ◽  
Author(s):  
Robert Sawko ◽  
Chris P. Thompson ◽  
Theodore E. Simos ◽  
George Psihoyios ◽  
Ch. Tsitouras
Keyword(s):  
Turbulent Flow ◽  
Yield Stress ◽  
Shear Thinning ◽  
Yield Stress Fluids ◽  
Strain Magnitude
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