Experimental and numerical study on the fragmentation mechanism of a single calcareous sand particle under normal compression

2021 ◽  
Author(s):  
Du-min Kuang ◽  
Zhi-lin Long ◽  
Rui-qi Guo ◽  
Tao Zhao ◽  
Kai Wu
Keyword(s):  
Numerical Study ◽  
Sand Particle ◽  
Fragmentation Mechanism ◽  
Calcareous Sand ◽  
Normal Compression

A Numerical Study of Sand Particle Erosion in a Series of Ball Seats in Gas-Particle Two-Phase Flow

2019 ◽  
Author(s):  
A. Rasteh ◽  
A. Farokhipour ◽  
M. A. Rasoulian ◽  
Z. Mansoori ◽  
M. Saffar-Avval ◽  
...  
Keyword(s):  
Oil And Gas ◽  
Numerical Study ◽  
Cone Angle ◽  
Gas Production ◽  
Sudden Expansion ◽  
Sand Particle ◽  
Two Phase ◽  
Operational Conditions ◽  
Wide Range ◽  
Single Cone

Abstract Fracking (fracturing) is of great importance for enhancing oil and gas production from low permeability reservoirs. Since in fracking fluid, suspension of sand particles are used, the erosion failure of fracturing equipment has become an increasing concern. Accordingly, investigation of erosion of commonly used fittings such as ball seats in order to decrease its adverse consequences has attracted considerable attentions. Although the erosion wear of gas-solid flows in the pipe sudden expansion was investigated in the literature, the effect of particle size, ball seat shape and the contraction configurations on the erosion-induced wear is not fully understood. This study is aimed to explore the most erosion-resistant configuration of a ball seat under various operational conditions. A CFD model is used and a wide range of geometries are investigated. The studied configurations are categorized in three main groups including single cone, double cone and curved cone. In each category, different cone angles and curve styles are considered. The results showed that, among the single cone ball seats, the cone angle of 15° is the most erosion-resistant configuration. It was also shown that the third-order curve style cone has the best erosion performance.

Numerical Study of an Inlet Particle Separator

2004 ◽  
Author(s):  
A. Ghenaiet ◽  
S. C. Tan
Keyword(s):  
Separation Efficiency ◽  
Numerical Study ◽  
Turbine Engines ◽  
Sand Particle ◽  
Field Calculation ◽  
Particle Trajectories ◽  
Viscous Forces ◽  
Mass Flow Rates ◽  
Sand Particles ◽  
Particle Separator

Helicopters operating in a desert region are often subjected to the environmental effects of sand ingestion that can erode gas turbine engines and block the cooling passages. Traditional method of removing sand particles include barrier filters that employed vortex tube and impact filter designs, and inertial particle separator (IPS). Barrier filters are normally quite heavy and require constant servicing or replacement. IPS relies on contoured surfaces to direct particulates to a scavenge area through the actions of the viscous forces and bounce characteristics of the sand particles. The geometrical design of an IPS plays an important role in determining the sand separation efficiency. This paper presents a numerical study of the RTM322 IPS, which includes the effects of changing the hub, splitter and scavenge duct geometries on the sand separation efficiency. The flow field calculation in the IPS was performed with the commercial CFD software package called TASCflow. The particle trajectories were computed using an in-house developed trajectory code, which was based on the lagrangian method. The effects of flow turbulence on the trajectory were simulated using the eddy lifetime concept. Several design geometrical modifications were investigated such as the shape of the hub and splitter and their relative locations. Particle trajectories and separation efficiency were performed for a range of sand particle sizes, inlet mass flow rates and scavenge ratios.

Numerical Study on Aeolian Sand Ripples Forming and Moving Process in Desert Highway

2011 ◽  
Vol 462-463 ◽  
pp. 1032-1037 ◽  
Author(s):  
Abdurahman Ablimit ◽  
Mamtimin Gheni ◽  
Zhong Hua Xu ◽  
Mamatjan Tursun ◽  
Xamxinur Abdikerem
Keyword(s):  
Flow Field ◽  
Numerical Study ◽  
Numerical Models ◽  
Flow Direction ◽  
Sand Particle ◽  
Forming Process ◽  
Sand Surface ◽  
Airflow Field ◽  
Sand Flow ◽  
Desert Highway

In this paper, the sand break into highway problem in desert, which is caused by the sand flow blown by wind, is studied. The mathematical models are introduced by considering the fixed, semi-fixed and free sand desert fields based on the fluid dynamics and the sand particle dynamics. Different kinds of numerical models are made by changing the desert highway height, wind flow direction and its uniformity. The weak coupling method is used due to spatial relationships between air flow field and the sand flow field. Finally, by coupling the airflow field and sand flow field with desert highway, the numerical simulations of sand forming process on desert highway are conducted. The numerical results shown, that the wind blown sand breaks into highway easier when wind direction perpendicular highway and if the highway height higher than the range size of the sand surface the wind blown sand break into highway is more difficult.

Numerical study on bearing behavior of pile considering sand particle crushing

2013 ◽  
Vol 5 (3) ◽  
pp. 241-261 ◽  
Author(s):  
Yang Wu ◽  
Haruyuki Yamamoto ◽  
Yangping Yao
Keyword(s):  
Numerical Study ◽  
Sand Particle ◽  
Particle Crushing ◽  
Bearing Behavior

scholarly journals Numerical study of mixing and heat transfer of SRF particles in a bubbling fluidized bed

2019 ◽  
Vol 142 (2) ◽  
pp. 1087-1096
Author(s):  
Mohamed Sobhi Alagha ◽  
Botond Szucs ◽  
Pal Szentannai
Keyword(s):  
Heat Transfer ◽  
Experimental Data ◽  
Fluidized Bed ◽  
Present Model ◽  
Numerical Study ◽  
Sand Particle ◽  
Particle Sizes ◽  
Proposed Model ◽  
Bubbling Fluidized Bed ◽  
Good Agreement

AbstractIn this article, numerical investigations on mixing and heat transfer of solid refused fuel (SRF) particles in a bubbling fluidized bed are carried out. The numerical model is based on the Eulerian–Eulerian approach with empirical submodels representing gas–solid and solid–solid interactions. The model is verified by experimental data from the literature. The experimental data include SRF vertical distribution in SRF–sand mixtures of different sand particle sizes ($$d_{\mathrm{pm}} = 654,810$$ d pm = 654 , 810 and 1110 $$\upmu$$ μ m) at different fluidization velocities ($$u/u_{\mathrm{mf}} = 1.2$$ u / u mf = 1.2 –2.0). We proposed magnification of drag force exerted by the gas on SRF particles based on Haider and Levenspiel (Powder Technol 58(1):63–70, 1989) drag coefficient. The proposed model shows good agreement with the experimental data at high fluidization velocities ( $$u/u_{\mathrm{mf}} = 1.5$$ u / u mf = 1.5 –2.0) and poor predictions at low fluidization velocities ($$u/u_{\mathrm{mf}} = 1.2$$ u / u mf = 1.2 –1.5). Heat transfer results showed that the present model is valid and gives good agreement with the experimental data of wall–bed heat transfer coefficient.

scholarly journals Experimental and numerical study on fragmentation mechanism of copper sheet in laser dynamic forming

2021 ◽  
Author(s):  
Songling Chen ◽  
Pin Li ◽  
Xijin Zhen ◽  
Zongbao Shen ◽  
Huixia Liu ◽  
...  
Keyword(s):  
Numerical Study ◽  
Fragmentation Mechanism ◽  
Copper Sheet

A Numerical Study of Sand Particle Erosion in Elbow and a Series of Plugged Tees in Gas-Particle Two-Phase Flow

2018 ◽  
Author(s):  
A. Farokhipour ◽  
Z. Mansoori ◽  
M. Saffar-Avval ◽  
M. A. Rasoulian ◽  
A. Rasteh ◽  
...  
Keyword(s):  
Erosion Rate ◽  
Fine Particles ◽  
Numerical Study ◽  
Simple Algorithm ◽  
Sand Particle ◽  
Particle Erosion ◽  
Two Phase ◽  
Natural Gas Pipelines ◽  
Sand Erosion ◽  
Sst Turbulence Model

Sand particle erosion is the main cause of the failure of bends in the natural gas pipelines. The rapid progress of computational power and modern numerical methods has provided the opportunity for developing realistic simulation of the erosion process. The goal of this paper is to predict the sand erosion rates with the use of computational fluid dynamics in the gas/solid flows in the plugged tees and standard elbows. For this purpose, the Eulerian-Lagrangian approach was used. To simulate the flow, the SIMPLE algorithm and the k-ω SST turbulence model were used. Particles were injected into the inlet pipe with different sizes. To predict more realistic results the Grant and Tabakoff stochastic rebound model was applied and the Oka model was used to calculate erosion. The results showed that, the use of plugged tee instead of a standard elbow would reduce the erosion rate only for fine particles. Also, for them, by increasing the plugged length the pipe will experience less erosion. For coarser particles, however, the vortex created in the plugged section did not affect the particles velocity; therefore, the erosion rate was not reduced.

scholarly journals Analysis of calcareous sand particle shape using fourier descriptor analysis

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Lamia Touiti ◽  
Taesik Kim ◽  
Young-Hoon Jung
Keyword(s):  
Image Analysis ◽  
Particle Shape ◽  
Particle Morphology ◽  
Silica Sand ◽  
Sand Particle ◽  
Fourier Descriptors ◽  
Calcareous Sand ◽  
Texture Characteristics ◽  
Very High ◽  
Accurate Quantification

Abstract Soil particle shape analysis was conducted on two calcareous sands from Dissa and Matmata in Tunisia and one silica sand from Jumunjin in Korea using an image analysis method. This technique uses complex Fourier shape descriptors and image analysis of sand grains SEM photographs to provide accurate quantification of particle morphology and texture. The Fourier descriptors, denoted “Signature Descriptors”, provide measures of Elongation, Triangularity, Squareness, and Asymmetry and identify the overall shape of soil particles. A summary of higher-order descriptors provides textural information linked up to local roughness and texture characteristics. After analyzing the Fourier descriptors, elongation was found to be the major characteristics of the three sands, mainly for the Dissa and Matmata carbonate sands. In addition, the elongation signature descriptors for the Dissa and Matmata sands have very high values compared to those of Ras Alkhair (Saudi Arabia) and Dog’s bay (Ireland) sands. Therefore, the Dissa and Matmata carbonate sands have higher angles of friction and higher critical state angle of friction than Ras Alkhair and Dog’s bay sands. Furthermore, the Dissa and Matmata carbonate sands show higher roughness than Jumunjin’s silica sand.

scholarly journals A Numerical Study of Aeolian Sand Particle Flow Incorporating Granular Pseudofluid Optimization and Large Eddy Simulation

Atmosphere ◽  
2020 ◽  
Vol 11 (5) ◽  
pp. 448
Author(s):  
Yang Zhang ◽  
Changsong Wu ◽  
Xiaosi Zhou ◽  
Yuanming Hu ◽  
Yuan Wang ◽  
...  
Keyword(s):  
Large Eddy Simulation ◽  
Numerical Study ◽  
Particle Flow ◽  
Sand Particle ◽  
Frictional Stress ◽  
Sand Sample ◽  
Aeolian Sand ◽  
Near Surface ◽  
Eddy Simulation ◽  
Large Eddy

A numerical investigation of aeolian sand particle flow in atmospheric boundary layer is performed with a Eulerian–Eulerian granular pseudofluid model. In this model, the air turbulence is modelled with a large eddy simulation, and a kinetic–frictional constitutive model incorporating frictional stress and the kinetic theory of granular flow is applied to describe the interparticle movement. The simulated profiles of streamwise sand velocity and sand mass flux agree well with the reported experiments. The quantitative discrepancy between them occurs near the sand bed surface, which is due to the difference in sand sample, but also highlights the potential of the present model in addressing near-surface mass transport. The simulated profiles of turbulent root mean square (RMS) particle velocity suggest that the interparticle collision mainly account for the fluctuation of sand particle movement.

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