Effect of van der Waals force on bubble dynamics in bubbling fluidized beds of ellipsoidal particles

Shrestha, Siddhartha; Kuang, Shibo; Yu, Aibing; Zhou, Zongyan

doi:10.1016/j.ces.2019.115343

Cited by 26 publications

(21 citation statements)

References 62 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…, 2018 a ; Shrestha et al. 2019, 2020) in which the resultant interaction force between the elongated particle and the gas is directly calculated and acts on the centre of the mass of the particle. The fluid cell size needs to be larger than the fibre length in the previous work, while the fluid cell size can be much smaller than the fibre length in the present studies.…”

Section: Resultsmentioning

confidence: 99%

“…, 2018 a ; Shrestha et al. 2019, 2020), in which the resultant hydrodynamic force and torque were directly computed by assuming that the particle is immersed in a local homogeneous fluid field. In previous work, the fluid cell size is larger than the length of an elongated particle for the calculation of local mean fluid variables, as shown in figure 1.…”

Section: Coupled Dem-cfd Methodsmentioning

confidence: 99%

“…2016) and reduces the bubble sizes and rising velocities (Shrestha et al. 2020) in fluidized beds of ellipsoidal particles.…”

Section: Introductionmentioning

confidence: 99%

“…2018 a ; Shrestha et al. 2019, 2020), because reliable models of lift force and torque are not available and the effect of surrounding particles on the lift force and torque cannot be accurately considered for non-spherical particles in the DEM-CFD scheme. The effects of lift force and hydrodynamic torque on fluidized beds of elongated sphero-cylinders were investigated by Mema et al.…”

Section: Introductionmentioning

confidence: 99%

“…2018 a ; Shrestha et al. 2019, 2020). The present treatment of gas–fibre interaction allows the fluid cell size to be slightly larger than the diameter of the elemental spheres, but much smaller than the fibre length.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Discrete element method–computational fluid dynamics analyses of flexible fibre fluidization

Jiang

Guo

et al. 2021

J. Fluid Mech.

View full text Add to dashboard Cite

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Coupled Dem-cfd Methodsmentioning

confidence: 99%

“…2016) and reduces the bubble sizes and rising velocities (Shrestha et al. 2020) in fluidized beds of ellipsoidal particles.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Discrete element method–computational fluid dynamics analyses of flexible fibre fluidization

Jiang

Guo

et al. 2021

J. Fluid Mech.

View full text Add to dashboard Cite

show abstract

Characterizing bubble behavior in a pseudo‐2D fluidized bed of wet particles

Xu,

Guan,

Ocone

et al. 2023

AIChE Journal

View full text Add to dashboard Cite

By applying digital image analysis on the bubble characteristics in a two dimensional wet‐particle fluidized‐bed, we report two‐stage evolution of bubble characteristics with increasing liquid content. In the first stage, bubble number and uniformity of bubble fraction increase, while bubble average diameter and aspect ratio decrease. In the second stage, these characteristics shift toward an opposite direction. This two‐stage evolution of bubble characteristics are analogous to that of reducing particle size in dry‐particle fluidization, and the fluidizing properties of particles shifts from Geldart Group B to Group A and then to Group C. Furthermore, liquid addition causes a continuous decrease of bubble fraction and bubble flow rate. This is different from dry‐particle fluidization, in which reducing particle size causes an increase trend. An explanation for this difference is that liquid addition increases the equivalent size of agglomerates in wet‐particle fluidization, which is opposite to the effect of reducing particle size.

show abstract

Movement characteristics of coal powders at bottom of coalbed methane well under jet flow

Zhang,

Xue,

Wang

et al. 2024

Energy Science & Engineering

View full text Add to dashboard Cite

The removal and discharge of coal powders from coalbed methane wellbore is the key to maintaining continuous production. For this reason, based on the submerged jet theory, the force and migration starting conditions of coal powder particles deposited at the bottom of the coalbed methane well are analyzed by analyzing the cohesiveness of coal powders, and a model for the starting and migration of coal powders at the bottom of the well under submerged jet conditions is established; Considering the adhesion between coal dust, the adhesion coefficient is used to characterize the adhesion between particles, a mechanical model of coal dust particles deposited at the bottom of the well is established, and the corresponding calculation formula for the outlet flow rate of the coal dust cleaning nozzle is derived. The fluid mechanics parameters of the bottom of the well coal dust cleaning under different conditions are obtained, and the numerical simulation method is used to simulate the whole process of jet flushing of the bottom of the well coal dust deposited, and the effect of the bottom of the well jet flushing of coal dust deposits is analyzed, providing a theoretical basis for the bottom of the well coal dust flushing process.

show abstract

Effect of van der Waals force on bubble dynamics in bubbling fluidized beds of ellipsoidal particles

Cited by 26 publications

References 62 publications

Discrete element method–computational fluid dynamics analyses of flexible fibre fluidization

Discrete element method–computational fluid dynamics analyses of flexible fibre fluidization

Characterizing bubble behavior in a pseudo‐2D fluidized bed of wet particles

Movement characteristics of coal powders at bottom of coalbed methane well under jet flow

Contact Info

Product

Resources

About