Particle flow regime in a swirling pneumatic conveying system

Ji, Yun; Hao, Yating; Yi, Ning; Guan, Tianyuan; Gao, Dianrong

doi:10.1016/j.powtec.2022.117328

Cited by 17 publications

(5 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…When v 0 = 30 m/s, the static pressure drop of the swirling pipe was smaller than that of the straight pipe, indicating a velocity threshold beyond which the swirling generator can promote particle fluidization. In our previous study, it was reported that this value is the choking speed of conveying particles [3]. After the initial airflow velocity exceeded the choking velocity, the static pressure drop of the swirling pipes with a smaller pitch gradually exceeded that of the straight pipe.…”

Section: Swirlingmentioning

confidence: 86%

See 1 more Smart Citation

The Effect of a Three-Blade Tube on the Pneumatic Transport of Pebble Particles

Hao,

Chen,

2023

Energies

Self Cite

View full text Add to dashboard Cite

In this paper, the Computational Fluid Dynamics–Discrete Element Method (CFD-DEM) coupling method was used to simulate the pneumatic transport of pebble particles in a three-blade spiral tube. The results showed that the flow field distribution rotated along the circumference after loading. The maximum velocity of the flow field after loading was manifested as rotation along the circumference. In addition, the swirl intensity decreased exponentially with the increase in conveying distance, and the maximum swirl intensity had a saturation value. After reaching the saturation value, it is not evident that increasing the initial air velocity significantly affected swirl variation. The smaller the pitch, the greater the initial swirl intensity. The swirling flow was conducive to the fluidization of particles, but it would bring a significant energy loss. Increasing the swirl can increase the degree of particle dispersion. There is an optimal tangential airflow velocity, which allows the particles to fully spin and stay in the suspension zone without being thrown onto the pipe wall by excessive centrifugal force. At this time, the energy efficiency reaches the highest level. A 5.87 m/s velocity was deemed the optimal tangential airflow velocity for conveying 3 mm particles.

show abstract

Section: Swirlingmentioning

confidence: 86%

“…Higher gas velocities for pneumatic conveying can lead to higher power consumption, particle degradation, and pipeline erosion [2]. Lower gas velocities can cause pipeline blockage due to pressure loss [3]. To solve the above issues, swirling flow is applied to pneumatic conveying to facilitate particle fluidization.…”

Section: Introductionmentioning

confidence: 99%

The Effect of a Three-Blade Tube on the Pneumatic Transport of Pebble Particles

Hao,

Chen,

2023

Energies

Self Cite

View full text Add to dashboard Cite

show abstract

“…According to the different guiding mechanisms of spiral flow, there are three types of pipe spiral flow swirlers: spiral blade type, spiral wall type, and tangential inflow type [23][24][25][26][27][28]. Their characteristics and applications were shown in Table 1.…”

Section: Physical Model Of Swirlers and Elbowsmentioning

confidence: 99%

Influence and optimization of swirler parameters on elbow wear of deep coal fluidization pipeline transportation system

Zhao,

Bao,

et al. 2024

Friction

View full text Add to dashboard Cite

Elbow wear is a major threat to the multiphase pipeline transportation industry, which has a negative impact on the stable operation of the transportation system. In order to find the wear reduction methods of elbows in the fluidization pipeline transportation system for 2000-meter-deep coal resources, the swirler was installed upstream of the elbows, and wear simulations and tests of three kinds of elbows were carried out. The results showed that the maximum wear rate (MWR) of elbows increased and then decreased along the elbow angle. Due to the different directions of gravity, the heavy wear position (HWP) of the horizontal-vertical (H-V) elbow was in front of the vertical-horizontal (V-H) elbow. Because the downstream portion of the horizontal-horizontal (H-H) elbow was still a horizontal pipe, the HWP of the H-H elbow almost covered the whole elbow. The swirler placed upstream of the elbows could make the particles at the elbow move to the intrados of the elbows, resulting in less collision between the particles and the extrados of the elbows, thus reducing the wear of the elbows. The wear reduction effects of swirlers on three different elbows were favorably connected with the guide vane angle (GVA) and negatively correlated with the guide vane length (GVL), decreased first and then increased as the guide vane height (GVH) increased, and were little affected by the guide vane number (GVN) and the guide vane thickness (GVT). The mathematical models between the MWR of the elbows and guide vane parameters were established. By bench tests, the wear reduction effect of three kinds of elbows under the optimal guide vane parameters was 58.4%, 76.9%, and 78.6%, respectively. The errors between the bench test results and the simulation results were around 10%.

show abstract

“…Swirl is a widespread flow phenomenon in nature, which is characterized by a flow field with a significant tangential flow component, and the change in the tangential flow velocity has a decisive influence on the characteristics of the flow field. 15,16 Relevant research in the field of pneumatic conveying shows that the use of swirling flow generated by swirling devices such as three-blade helical tubes and helical blades to make particles move in a spiral form can slow down the collision between particles and the wall to a certain extent and contribute to the reduction in the energy consumption. [17][18][19] Li et al 20 studied the key parameters of swirl pneumatic conveying and found that the axial and tangential components of the particle velocity distribute symmetrically along the radial and axial directions of the pipeline, respectively.…”

Section: Introductionmentioning

confidence: 99%

The effects of imposed swirling flow on the transport and deposition of particulate pollutants in the 90° industrial duct bends: An Eulerian-Lagrangian approach

Han,

Diao,

Zhuang

et al. 2023

Indoor and Built Environment

View full text Add to dashboard Cite

Duct bend is one of the important parts of ventilation and dust removal systems, and particles deposited in curved ducts can reduce system efficiency or cause erosion on the bend wall. To investigate whether particle deposition is affected by imposed swirl on fluid flow, this article combines the RSM turbulence model and the Discrete Phase Model (DPM) to predict the deposition efficiency of particles in the bend under high Reynolds number conditions. The results show that the imposed swirl flow modifies the secondary flow initially dominated by the pressure gradient caused by the curvature effect. With the gradual increase of the swirl number ( S n), the deposition efficiency of the particles gradually decreased. However, when the swirl number is low ( S n ≤ 0.17), particles with smaller Stokes numbers are more susceptible to the intensity of turbulence. The higher the turbulence intensity near the wall, the easier it is for low inertia particles ( St ≤ 0.456) to deposit. The higher swirl intensity dominates the centrifugal force, reduces the turbulent intensity in the central region of the duct, improves the stability of the airflow and makes it easier for particles with larger inertia ( St ≥ 0.811) to pass through the bend.

show abstract

Particle flow regime in a swirling pneumatic conveying system

Cited by 17 publications

References 30 publications

The Effect of a Three-Blade Tube on the Pneumatic Transport of Pebble Particles

The Effect of a Three-Blade Tube on the Pneumatic Transport of Pebble Particles

Influence and optimization of swirler parameters on elbow wear of deep coal fluidization pipeline transportation system

The effects of imposed swirling flow on the transport and deposition of particulate pollutants in the 90° industrial duct bends: An Eulerian-Lagrangian approach

Contact Info

Product

Resources

About