Prediction of drag coefficient and ultimate settling velocity for high-density spherical particles in a cylindrical pipe

2020 ◽  
Vol 32 (5) ◽  
pp. 053303
Keyword(s):  
Drag Coefficient ◽  
Settling Velocity ◽  
High Density ◽  
Spherical Particles ◽  
Cylindrical Pipe

Settling Behavior of Particles in Bubble Containing Newtonian Fluids: Experimental Study and Model Development

2021 ◽  
Author(s):  
Silin Jing ◽  
Xianzhi Song ◽  
Zhaopeng Zhu ◽  
Buwen Yu ◽  
Shiming Duan
Keyword(s):  
Reynolds Number ◽  
Drag Coefficient ◽  
Volume Concentration ◽  
Settling Velocity ◽  
Particle Density ◽  
Particle Diameter ◽  
Newtonian Fluids ◽  
Spherical Particles ◽  
Bubble Volume ◽  
Particle Reynolds Number

Abstract Accurate description of cuttings slippage in the gas-liquid phase is of great significance for wellbore cleaning and the control accuracy of bottom hole pressure during MPD. In this study, the wellbore bubble flow environment was simulated by a constant pressure air pump and the transparent wellbore, and the settling characteristics of spherical particles under different gas volume concentrations were recorded and analyzed by highspeed photography. A total of 225 tests were conducted to analyze the influence of particle diameter (1–12mm), particle density (2700–7860kg/m^3), liquid viscosity and bubble volume concentration on particle settling velocity. Gas drag force is defined to quantitatively evaluate the bubble’s resistance to particle slippage. The relationship between bubble drag coefficient and particle Reynolds number is obtained by fitting the experimental results. An explicit settling velocity equation is established by introducing Archimedes number. This explicit equation with an average relative error of only 8.09% can directly predict the terminal settling velocity of the sphere in bubble containing Newtonian fluids. The models for predicting bubble drag coefficient and the terminal settling velocity are valid with particle Reynolds number ranging from 0.05 to 167 and bubble volume concentration ranging from 3.0% to 20.0%. Besides, a trial-and-error procedure and an illustrative example are presented to show how to calculate bubble drag coefficient and settling velocity in bubble containing fluids. The results of this study will provide the theoretical basis for wellbore cleaning and accurate downhole pressure to further improve the performance of MPD in treating gas influx.

Predicting the drag coefficient and settling velocity of spherical particles

2013 ◽  
Vol 239 ◽  
pp. 12-20 ◽  
Author(s):  
A. Terfous ◽  
A. Hazzab ◽  
A. Ghenaim
Keyword(s):  
Drag Coefficient ◽  
Settling Velocity ◽  
Spherical Particles

Side-view-only determination of drag coefficient and settling velocity for non-spherical particles

2018 ◽  
Vol 339 ◽  
pp. 182-191 ◽  
Author(s):  
David E.S. Breakey ◽  
Farid Vaezi G. ◽  
Jacob H. Masliyah ◽  
R. Sean Sanders
Keyword(s):  
Drag Coefficient ◽  
Settling Velocity ◽  
Spherical Particles ◽  
Side View

A new model for predicting drag coefficient and settling velocity of spherical and non-spherical particle in Newtonian fluid

2017 ◽  
Vol 321 ◽  
pp. 242-250 ◽  
Author(s):  
Xianzhi Song ◽  
Zhengming Xu ◽  
Gensheng Li ◽  
Zhaoyu Pang ◽  
Zhaopeng Zhu
Keyword(s):  
Drag Coefficient ◽  
Spherical Particle ◽  
Newtonian Fluid ◽  
Settling Velocity ◽  
New Model

Predicting fiber drag coefficient and settling velocity of sphere in fiber containing Newtonian fluids

2017 ◽  
Vol 159 ◽  
pp. 409-418 ◽  
Author(s):  
Zhengming Xu ◽  
Xianzhi Song ◽  
Gensheng Li ◽  
Qingling Liu ◽  
Zhaoyu Pang ◽  
...  
Keyword(s):  
Drag Coefficient ◽  
Settling Velocity ◽  
Newtonian Fluids
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