Flow through an elbow: A direct numerical simulation investigating turbulent flow quantities

Venters, Ravon; Helenbrook, Brian T.; Ahmadi, Goodarz; Bohl, Douglas; Bluestein, Andrew M.

doi:10.1016/j.ijheatfluidflow.2021.108835

Cited by 3 publications

(3 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In general, the results obtained at the two Reynolds numbers considered are qualitatively very similar. Moreover, the described flow patterns are in close agreement with the experimental observations [70,73] and numerical results [74,75] reported in the literature concerning sharp 90 • bend flows. However, a direct comparison can not be carried out, since on the one hand a different range of Re (up to Re ≈ 1.2 • 10 5 ) was investigated in these studies.…”

Section: Flow In the 90 • Pipe Bendsupporting

confidence: 89%

See 1 more Smart Citation

LES of Particle-Laden Flow in Sharp Pipe Bends with Data-Driven Predictions of Agglomerate Breakage by Wall Impacts

Khalifa

Gollwitzer

Breuer

2021

Fluids

View full text Add to dashboard Cite

The breakage of agglomerates due to wall impact within a turbulent two-phase flow is studied based on a recently developed model which relies on two artificial neural networks (ANNs). The breakup model is intended for the application within an Euler-Lagrange approach using the point-particle assumption. The ANNs were trained based on comprehensive DEM simulations. In the present study the entire simulation methodology is applied to the flow through two sharp pipe bends considering two different Reynolds numbers. In a first step, the flow structures of the continuous flow arising in both bend configurations are analyzed in detail. In a second step, the breakage behavior of agglomerates consisting of spherical, dry and cohesive silica particles is predicted based on the newly established simulation methodology taking agglomeration, fluid-induced breakage and breakage due to wall impact into account. The latter is found to be the dominant mechanism determining the resulting size distribution at the bend outlet. Since the setups are generic geometries found in dry powder inhalers, important knowledge concerning the effect of the Reynolds number as well as the design type (one-step vs. two-step deflection) can be gained.

show abstract

Section: Flow In the 90 • Pipe Bendsupporting

confidence: 89%

“…However, a direct comparison can not be carried out, since on the one hand a different range of Re (up to Re ≈ 1.2 • 10 5 ) was investigated in these studies. On the other hand, a sharp duct bend with a square cross-section was taken into account in the studies employing comparable Re [73,75]…”

Section: Flow In the 90 • Pipe Bendmentioning

confidence: 99%

LES of Particle-Laden Flow in Sharp Pipe Bends with Data-Driven Predictions of Agglomerate Breakage by Wall Impacts

Khalifa

Gollwitzer

Breuer

2021

Fluids

View full text Add to dashboard Cite

show abstract

“…The hydraulic behavior within the intercepting pipe also has a significant impact on the intercepting capability just before spill flow occurs. The liquid in the chamber close to the sidewall of the drain duct flows to the inlet of the tube and then is forced to leave the wall due to the bent flow, and the boundary layer separation would be occurred [19]. After the liquid enters the tube, it will flow to the void by the separation of the boundary layer, thereby forming a backflow (Figure 4).…”

Section: Hydraulicmentioning

confidence: 99%

Full Scale Test and Numerical Simulation Based on Artificial Intelligence Background Analyze Hydraulic Structures and Derive Weir Height Equation

Cao

Hong

2022

Wireless Communications and Mobile Computing

View full text Add to dashboard Cite

The confluence overflow facility with transverse weir is adopted in China to reduce the occurrence of overflow. Under normal conditions, most of the facilities do not overflow. The study on the hydraulic structure without overflow is helpful to improve the pollutant interception efficiency. In addition, the weir height equation for different intercepting pipe diameters was required. Full scale experiments and simulation studies were carried out, and the reliability of the simulation results was verified by experiments. The simulation describes the hydraulic structure and shows that the backflow area appears on the side of the chamber away from the interceptor and at the inlet of the pipe. The results show that when the ratio of weir height to pipe diameter is less than 1.2, the closure pipe is non pressure closure, when the ratio is from 1.2 to 1.75, it becomes half pressure, and when the ratio is greater than 1.75, it is converted to pressure. The increased rate of intercepting flow with the rise of weir height would change under the effect of different flow characteristics. Based on the experimental data distribution and the hydraulic characteristic, the weir height equation was deduced for the pipe diameter of 0.4 m. Other pipe diameter simulations showed that this equation was also applicable.

show abstract

CFD investigation of blind-tee effects on flow mixing mechanism in subsea pipelines

Han

Liu

Ong

et al. 2022

Engineering Applications of Computational Fluid Mechanics

View full text Add to dashboard Cite

Flow through an elbow: A direct numerical simulation investigating turbulent flow quantities

Cited by 3 publications

References 38 publications

LES of Particle-Laden Flow in Sharp Pipe Bends with Data-Driven Predictions of Agglomerate Breakage by Wall Impacts

LES of Particle-Laden Flow in Sharp Pipe Bends with Data-Driven Predictions of Agglomerate Breakage by Wall Impacts

Full Scale Test and Numerical Simulation Based on Artificial Intelligence Background Analyze Hydraulic Structures and Derive Weir Height Equation

CFD investigation of blind-tee effects on flow mixing mechanism in subsea pipelines

Contact Info

Product

Resources

About