Euler model of mass loss in the process of hypersonic solid particle impact

2016 ◽  
Author(s):  
Hao Dai ◽  
Chunling Zhu ◽  
Huanyu Zhao ◽  
Zhengzhi Wang
Keyword(s):  
Mass Loss ◽  
Solid Particle ◽  
Particle Impact ◽  
Euler Model

Experimental Investigation of the Location of Maximum Erosive Wear Damage in Elbows

2008 ◽  
Vol 130 (1) ◽  
Author(s):  
Quamrul H. Mazumder ◽  
Siamack A. Shirazi ◽  
Brenton McLaury
Keyword(s):  
Experimental Investigation ◽  
Mass Loss ◽  
Solid Particle ◽  
Impact Velocity ◽  
Single Phase ◽  
Erosive Wear ◽  
Particle Impact ◽  
Erosion Behavior ◽  
Wear Damage ◽  
Particle Impact Velocity

Erosive wear damage of elbows due to solid particle impact has been recognized as a significant problem in several fluid handling industries. Solid particle erosion is a complex phenomenon due to different parameters causing material removal from the metal surface. The particle density, size, shape, velocity, concentration, impact angle, and impacting surface material properties are some of the major parameters. Among the various factors, the particle impact velocity has the greatest influence in erosion. The particle impact velocity and impact angles depend on the fluid velocity and fluid properties. The particle to particle, particle to fluid, and particle to wall interactions increase the complexity of the erosive wear behavior. In multiphase flow, the presence of different fluids and their corresponding spatial distribution of the phases, adds another dimension to the problem. Most of the previous investigations were focused on determination of erosion in terms of mass loss of the eroding surfaces without identifying the specific location of the maximum erosive wear. During this investigation, magnitude of erosion at different location of an elbow specimen was measured to determine the location of maximum erosion. Experimental investigation of erosion in single-phase and multiphase flows was conducted at different fluid velocities. Both mass loss and thickness loss measurements were taken to characterize erosion behavior and erosion patterns in an elbow. Experimental results showed different erosion behavior and location of maximum erosion damage in single-phase and multiphase flows. The locations of maximum wear due to erosion were also different for horizontal flow compared to vertical flow.

The erosion and deformation of polyethylene by solid-particle impact

1987 ◽  
Vol 321 (1558) ◽  
pp. 277-303 ◽  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Mass Loss ◽  
Solid Particle ◽  
High Speed ◽  
Particle Impact ◽  
High Speed Photography ◽  
Flux Rate ◽  
Steel Sphere ◽  
Scanning Electron

In recent years, polyethylene (PE) has found increasing use in applications involving impact and erosion. This paper describes a detailed study of the properties of PE subjected to solid particle impact. Flat discs of the material were eroded by sieved sand (300-600 pm) accelerated by using an air blast rig in which the important variables of velocity, angle and mass flux rate are accurately controllable and measurable. Scanning electron microscopy of lightly eroded specimens enabled four basic crater types to be identified: smooth, ploughed, cut, and dented. The proportions of each were established over a range of angles. Long time erosion experiments were conducted in which the flux rate for each angle was adjusted to keep the number of impacts per unit time constant. The dimensionless erosion parameter, e (mass lost per unit mass of erodent that has struck) was computed by using the rate of mass loss when steady-state erosion had been established. Most erosion was found to occur at an angle of 20—30°, the mass loss becoming zero at around 80°. An analysis by D. R. Andrews is presented, showing that the flux rates used in these experiments are well below those needed to cause wear by thermal mechanisms, and this was confirmed by changing the flux rate: mass loss increased in proportion. Macroscopic particles were used to model sand grain impacts, spheres for rounded particles and square plates for sharp ones. A range of techniques was used in this study including high-speed photography (framing speed of 5 x 10 4 s -1 ), scanning electron microscopy, and moire methods (both in-plane and out-of-plane). A deformation map was constructed for steel sphere im pacts giving the type of crater to be expected at a given angle and speed. It was observed that sand grains required much lower speeds at a given angle to produce a given crater type. High-speed photography enabled mass-loss mechanisms for single-particle impact to be identified. These were the drawing-out of filaments and the machining-out of chips. Quantitative data on kinetic energy losses were obtained, and these, combined with moire methods that gave the sizes of deformed zones, enabled an estimate of the temperature rise per impact to be made (25 K).

Modeling study of solid-particle erosion with consideration of particle velocity dependent model parameters

2016 ◽  
Vol 07 (03) ◽  
pp. 1650026 ◽  
Author(s):  
Shijie Qian ◽  
Kuiying Chen ◽  
Rong Liu ◽  
Ming Liang
Keyword(s):  
Experimental Data ◽  
Solid Particle ◽  
Particle Velocity ◽  
Target Material ◽  
Model Parameters ◽  
Particle Impact ◽  
Erosion Rates ◽  
Proposed Model ◽  
Dependent Model ◽  
Predicted Model

An advanced erosion model that correlates two model parameters—the energies required to remove unit mass of target material during cutting wear and deformation wear, respectively, with particle velocity, particle size and density, as well as target material properties, is proposed. This model is capable of predicting the erosion rates for a material under solid-particle impact over a specific range of particle velocity at the impingement angle between [Formula: see text] and [Formula: see text], provided that the experimental data of erosion rate for the material at a particle velocity within this range and at impingement angles between [Formula: see text] and [Formula: see text] are available. The proposed model is applied on three distinct types of materials: aluminum, perspex and graphite, to investigate the dependence behavior of the model parameters on particle velocity for ductile and brittle materials. The predicted model parameters obtained from the model are validated by the experimental data of aluminum plate under Al2O3 particle impact. The significance and limitation of the model are discussed; possible improvements on the model are suggested.

Erosion Due to Solid Particle Impact on the Turbine Blade: Experiment and Simulation

2019 ◽  
Vol 19 (6) ◽  
pp. 1739-1744 ◽  
Author(s):  
Bahman Taherkhani ◽  
Ali Pourkamali Anaraki ◽  
Javad Kadkhodapour ◽  
Nahid Kangarani Farahani ◽  
Haoyun Tu
Keyword(s):  
Solid Particle ◽  
Turbine Blade ◽  
Particle Impact ◽  
Experiment And Simulation

The impact angle dependence of erosion damage caused by solid particle impact

Wear ◽  
1997 ◽  
Vol 203-204 ◽  
pp. 573-579 ◽  
Author(s):  
Y.I. Oka ◽  
H. Ohnogi ◽  
T. Hosokawa ◽  
M. Matsumura
Keyword(s):  
Solid Particle ◽  
Impact Angle ◽  
Particle Impact ◽  
Erosion Damage ◽  
Angle Dependence ◽  
The Impact

Particle Tracking Velocimetry (PTV) Measurement of Abrasive Microparticle Impact Speed and Angle in Both Air-Sand and Slurry Erosion Testers

2016 ◽  
Author(s):  
Amir Mansouri ◽  
Hadi Arabnejad Khanouki ◽  
Siamack A. Shirazi ◽  
Brenton S. McLaury
Keyword(s):  
Solid Particle ◽  
Particle Tracking ◽  
Particle Tracking Velocimetry ◽  
Erosion Rate ◽  
Solid Particles ◽  
Particle Impact ◽  
Solid Particle Erosion ◽  
Impact Speed ◽  
Sand Flow ◽  
Sand Particles

Solid particle laden flows are very common in many industries including oil and gas and mining. Repetitive impacts of the solid particles entrained in fluid flow can cause erosion damage in industrial equipment. Among the numerous factors which are known to affect the solid particle erosion rate, the particle impact speed and angle are the most important. It is widely accepted that the erosion rate of material is dependent on the particle speed by a power law Vn, where typically n = 2–3. Therefore, accurate measurements of abrasive particle impact speed and angle are very important in solid particle erosion modeling. In this study, utilizing a Particle Image Velocimetry (PIV) system, particle impact conditions were measured in a direct impinging jet geometry. The measurements were conducted with two different test rigs, for both air-sand and liquid-sand flows. In air-sand testing, two types of solid particles, glass beads and sharp sand particles, were used. The measurements in air-sand tests were carried out using particles with various sizes (75, 150, and 500 μm). Also, submerged testing measurements were performed with 300 μm sand particles. In the test conditions, the Stokes number was relatively high (St = 3000 for air/sand flow, St = 27 for water/sand flow), and abrasive particles were not closely following the fluid streamlines. Therefore, a Particle Tracking Velocimetry (PTV) technique was employed to measure the particle impact speed and its angle with the target surface very near the impact. Furthermore, Computational Fluid Dynamics (CFD) simulations were performed, and the CFD results were compared with the experimental data. It was found that the CFD results are in very good agreement with experimental data.

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