Effects of solid particles and wall roughness on turbulent boundary layer in a two-phase horizontal channel flow

Luo, Kun; Zhang, Hancong; Luo, Mingbo; Wu, Xuecheng; Fan, Jianren

doi:10.1016/j.powtec.2019.05.009

Cited by 7 publications

(2 citation statements)

References 37 publications

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“…explained the inverse relationship between the friction factor and Reynolds number in the coarse pipe still persisting in the coarse pipe, regardless of the rib height [13]. K. Luo found that particles with a greater number of Stokes showed a more distinct deposition in the inner region and less deposition of objects due to the presence of coarse elements [14].…”

Section: Resultsmentioning

confidence: 95%

Effect of Cylinder Surface Roughness to the Distance Formation of Vortex

Heriyani

Mugisidi

Hilmi

2020

sintek. jurnal. ilm. teknik. mesin

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Reduction of cylinder surface resistance can be accomplished by modifying roughness. The surface roughness structure is one of the important parameters which greatly affects the flow of fluid through the cylinder surface. Fluid flow forms a vortex flow pattern with certain characteristics. Therefore, this study aims to analyze the characteristics and effects of fluid flow through the rough surface of the outer wall of the pipe with visualization using Particle Image Velocity (PIV). This research was conducted experimentally at the Faculty of Engineering, UHAMKA. The pipe surface roughness values varied were 0.648 µm and 1.699 µm. The length of the pipe used is 20 cm with a diameter of 2 inches. Measurements are made from the center of the pipe to a distance of 0.16 m. The results show that the surface roughness of the cylinder pipe affects the fluid flow characteristics where the formation of eddies is caused by the addition of the roughness value. The rougher the pipe surface is, the farther the vortex formation will be. The vortex formation closest to the pipe is a pipe with a roughness value of 0.648 µm at a distance of 0.04 m.

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Section: Resultsmentioning

confidence: 95%

Effect of Cylinder Surface Roughness to the Distance Formation of Vortex

Heriyani

Mugisidi

Hilmi

2020

sintek. jurnal. ilm. teknik. mesin

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“…The hydrodynamic characteristics of debris flow are influenced not only by the roughness of the downstream gully [17][18][19][20] but also by the grain size, sediment concentration [21][22][23], although the behavior and influence of grain size on mudflow resulting from a tailings dam failure have not been examined sufficiently. To be able to assess the potential for damage in the event of tailings dam failure accurately, it is necessary to characterize the hydrodynamic properties of different particle sizes of the resulting mudflow.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Grain Size on the Hydrodynamics of Mudflow Surge from a Tailings Dam-Break

et al. 2019

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Due to the differences in mineral processing techniques, the grain-size of tailings used in the construction of a tailings pond is not commensurate. It has been determined that the hydrodynamic characteristics of mudflow resulting from the failure of tailings dams are directly influenced by grain-size, solids concentration, and the surface roughness of gully and impoundment geometry. However, the behavior and influence of the grain size of mudflow resulting from a tailings dam failure have not been sufficiently examined. To investigate the effect of grain size on the hydrodynamic characteristics of mudflow surging from tailings dam failure, the law of mudflow evolution, the change of dynamics pressure, and the velocity distributions of mudflow have been obtained via a series of flume experiments utilizing three types of grain size tailings (d50 = 0.72 mm; d50 = 0.26 mm; d50 = 0.08 mm, respectively). This study proves conclusively that with an increase in grain size, the peak value of mudflow depth notably decreases in the same section. Furthermore, it has been noted that both the velocity and the dynamic pressure raise significantly, wherein the velocity displays two distinct primary stages; namely a rapid reduction stage and a slow reduction stage. This research provides a framework for the exploration of the effect of grain size on the hydrodynamics of slurry surging from a tailings dam failure, and all presented results provide an indispensable tool in terms of the accurate assessment of potential damage in the case of a prospective impoundment failure.

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Experimental and numerical study of free-falling streams of particles impacting an inclined surface

Dodds

Sarhan

Naser

2023

Exp. Comput. Multiph. Flow

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This paper presents a detailed experimental and numerical analysis of free-falling particle streams impacting a 45° inclined surface of differing materials. The particles used in this study were glass spheres with average diameters of 136 and 342 µm and a density of 2500 kg/m3. The three mass flow rates considered are 50, 150, and 250 grams per minute (gpm). The effect of wall material on the collision process was also analysed. Special attention was paid to the influence of wall roughness. Therefore, a plate of stainless steel with polished surface, an aluminium sheet, and a Perspex plate with similar properties to those of the rest of the wall sections were used. The experimental data were used to improve and validate a wall collision model in the frame of the Lagrangian approach. A new drag force formula that includes the effects of particle concentration as well as particle Reynolds number was implemented into commercially available codes from CFX4-4 package. It was found that the improved CFD model better predicted the experimental measurements for the particle rebound properties. The rough-wall model in these results showed greater effect on smaller particles than on larger particles. The results also showed that the improved CFD model predicted the velocity changes slightly better than the standard model, and this was confirmed by both the quantitative velocity comparisons and the qualitative concentration plots. Finally, the inclusion of the particle-particle collision was shown to be the dominant factor in providing the dispersion of the particles post collision. Without a sufficient particle-particle collision model, the standard model showed all particles behaving virtually identical, with the main particle stream continuing after the collision process.

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Effects of solid particles and wall roughness on turbulent boundary layer in a two-phase horizontal channel flow

Cited by 7 publications

References 37 publications

Effect of Cylinder Surface Roughness to the Distance Formation of Vortex

Effect of Cylinder Surface Roughness to the Distance Formation of Vortex

The Effect of Grain Size on the Hydrodynamics of Mudflow Surge from a Tailings Dam-Break

Experimental and numerical study of free-falling streams of particles impacting an inclined surface

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