Erosion in Disturbed Liquid/Particle Pipe Flow: Effects of Flow Geometry and Particle Surface Roughness

CORROSION ◽  
1993 ◽  
Vol 49 (10) ◽  
pp. 850-857 ◽  
Author(s):  
J. Postlethwaite ◽  
S. Nesic
Keyword(s):  
Surface Roughness ◽  
Pipe Flow ◽  
Particle Surface ◽  
Liquid Particle ◽  
Flow Geometry ◽  
Flow Effects

Anisotropy Invariants of Reynolds Stress Tensor in a Duct Flow and Turbulent Boundary Layer

1998 ◽  
Vol 120 (2) ◽  
pp. 280-284 ◽  
Author(s):  
A. Mazouz ◽  
L. Labraga ◽  
C. Tournier
Keyword(s):  
Surface Roughness ◽  
Turbulent Flow ◽  
Stress Tensor ◽  
Reynolds Stress ◽  
Pipe Flow ◽  
Duct Flow ◽  
Reynolds Stress Tensor ◽  
Entire Thickness ◽  
Anisotropy Tensor ◽  
Flow Turbulence

The present study shows that the Reynolds stress anisotropy tensor for turbulent flow depends both on the nature of the surface and the boundary conditions of the flow. Contrary to the case of turbulent boundary layers with k-type surface roughness, the measured anisotropy invariants of the Reynolds stress tensor over a series of spanwise square bars separated by rectangular cavities (k-type) in duct flows show that roughness increases the anisotropy. There is a similarity between the effect of roughness on channel flow turbulence and that on pipe flow turbulence. The present data show that the effect of introducing a surface roughness significantly perturbs the entire thickness of the turbulent flow.

Effects of Particle Surface Roughness on In-Die Flow and Tableting Behavior of Lactose

2019 ◽  
Vol 108 (9) ◽  
pp. 3011-3019 ◽  
Author(s):  
Justin Yong Soon Tay ◽  
Berlinda Wen Ting Kok ◽  
Celine Valeria Liew ◽  
Paul Wan Sia Heng
Keyword(s):  
Surface Roughness ◽  
Particle Surface

scholarly journals Elastic back-scattering patterns via particle surface roughness and orientation from single trapped airborne aerosol particles

2017 ◽  
Vol 187 ◽  
pp. 224-231 ◽  
Author(s):  
Richard Fu ◽  
Chuji Wang ◽  
Olga Muñoz ◽  
Gorden Videen ◽  
Joshua L. Santarpia ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Aerosol Particles ◽  
Particle Surface ◽  
Back Scattering

scholarly journals A Novel Multi-Scale Particle Morphology Descriptor with the Application of SPHERICAL Harmonics

Materials ◽  
2020 ◽  
Vol 13 (15) ◽  
pp. 3286
Author(s):  
Wei Xiong ◽  
Jianfeng Wang ◽  
Zhuang Cheng
Keyword(s):  
Surface Roughness ◽  
Scale Effect ◽  
Scale Effects ◽  
Particle Surface ◽  
Relative Length ◽  
Particle Morphology ◽  
Length Scale ◽  
Multi Scale ◽  
Rate Of Increase ◽  
Macro Scale

Particle morphology is of great significance to the grain- and macro-scale behaviors of granular soils. Most existing traditional morphology descriptors have three perennial limitations, i.e., dissensus of definition, inter-scale effect, and surface roughness heterogeneity, which limit the accurate representation of particle morphology. The inter-scale effect refers to the inaccurate representation of the morphological features at the target relative length scale (RLS, i.e., length scale with respective to particle size) caused by the inclusion of additional morphological details existing at other RLS. To effectively eliminate the inter-scale effect and reflect surface roughness heterogeneity, a novel spherical harmonic-based multi-scale morphology descriptor Rinc is proposed to depict the incremental morphology variation (IMV) at different RLS. The following conclusions were drawn: (1) the IMV at each RLS decreases with decreasing RLS while the corresponding particle surface is, in general, getting rougher; (2) artificial neural network (ANN)-based mean impact values (MIVs) of Rinc at different RLS are calculated and the results prove the effective elimination of inter-scale effects by using Rinc; (3) Rinc shows a positive correlation with the rate of increase of surface area RSA at all RLS; (4) Rinc can be utilized to quantify the irregularity and roughness; (5) the surface morphology of a given particle shows different morphology variation in different sections, as well as different variation trends at different RLS. With the capability of eliminating the existing limitations of traditional morphology descriptors, the novel multi-scale descriptor proposed in this paper is very suitable for acting as a morphological gene to represent the multi-scale feature of particle morphology.

Effects of particle surface roughness on particle interactions in concentrated suspensions

AIChE Journal ◽  
1987 ◽  
Vol 33 (5) ◽  
pp. 862-866 ◽  
Author(s):  
L. A. Mondy ◽  
A. L. Graham ◽  
P. Stroeve ◽  
A. Majumdar
Keyword(s):  
Surface Roughness ◽  
Particle Surface ◽  
Particle Interactions ◽  
Concentrated Suspensions
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