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.

Effect of Particle Impact Velocity on Cone Crack Shape in Ceramic Material

2005 ◽  
Vol 297-300 ◽  
pp. 1321-1326 ◽  
Author(s):  
Sang Yeob Oh ◽  
Hyung Seop Shin
Keyword(s):  
Impact Velocity ◽  
Computational Simulation ◽  
Back Surface ◽  
Particle Impact ◽  
Cone Crack ◽  
Crack Shape ◽  
The Impact ◽  
Particle Impact Velocity ◽  
Sic Particle ◽  
Ring Cracks

The damage behaviors induced in a SiC by a spherical particle impact having a different material and size were investigated. Especially, the influence of the impact velocity of a particle on the cone crack shape developed was mainly discussed. The damage induced by a particle impact was different depending on the material and the size of a particle. The ring cracks on the surface of the specimen were multiplied by increasing the impact velocity of a particle. The steel particle impact produced the larger ring cracks than that of the SiC particle. In the case of the high velocity impact of the SiC particle, the radial cracks were generated due to the inelastic deformation at the impact site. In the case of the larger particle impact, the morphology of the damages developed were similar to the case of the smaller particle one, but a percussion cone was formed from the back surface of the specimen when the impact velocity exceeded a critical value. The zenithal angle of the cone cracks developed into the SiC decreased monotonically as the particle impact velocity increased. The size and material of a particle influenced more or less on the extent of the cone crack shape. An empirical equation was obtained as a function of impact velocity of the particle, based on the quasi-static zenithal angle of the cone crack. This equation will be helpful to the computational simulation of the residual strength in ceramic components damaged by the particle impact.

Solid particle erosive wear behaviour of Eulaliopsis binata fiber reinforced epoxy composite

2020 ◽  
pp. 135065012093164
Author(s):  
Subhrajit Pradhan ◽  
Samir K Acharya
Keyword(s):  
Solid Particle ◽  
Natural Fiber ◽  
Erosive Wear ◽  
Weight Percent ◽  
Polymer Composite Material ◽  
Neat Epoxy ◽  
Wear Behaviour ◽  
Erosion Behavior ◽  
Eulaliopsis Binata ◽  
The Impact

In the present work, Eulaliopsis binata, a natural fiber collected from the eastern part of India is taken as a reinforcement with epoxy resin to develop a new class of polymer composite material, which has been unexplored till date for tribological applications in the composite industry. Different characterization studies of the fiber such as SEM, EDS, XRD are carried out to astern its potential to be used as a fiber in composite. Short Eulaliopsis binata fiber of different weight percent (10, 20, 30, and 40) is incorporated in neat epoxy and polymer composites are fabricated using the hand lay-up method. Solid particle erosion behavior of the fabricated composites is studied with four different impact velocities (48, 72, 82, 116 m/s) and impinging angles (30°, 45°, 60°, 90°). Improved erosion wear resistance is exhibited by the composites after the addition of Eulaliopsis binata fiber to neat epoxy. In addition, the inclusion of fiber altered the erosion behavior of neat epoxy from brittle to semi ductile nature. The impact velocity of the erodent particles also shows significant effect on the erosion behavior of the developed composites. The eroded surfaces of the worn samples are analyzed with SEM to ascertain the failure mechanism of the developed composites.

SOLID PARTICLE EROSIVE WEAR BEHAVIOR OF Sol–Gel-DERIVED AA2024 THERMAL BARRIER COATINGS

2020 ◽  
pp. 2050051
Author(s):  
DIPAK KUMAR ◽  
K. N. PANDEY
Keyword(s):  
Solid Particle ◽  
Impact Velocity ◽  
Thermal Barrier Coatings ◽  
Flow Rate ◽  
Wear Behavior ◽  
Sol Gel ◽  
Erosive Wear ◽  
Impact Angle ◽  
Thermal Barrier ◽  
Barrier Coatings

Solid particle erosion behavior of non-conventional thermal barrier coatings prepared by dip coating of sol–gel 7[Formula: see text]wt.% yttria-stabilized zirconia (7YSZ) has been studied in the present paper. The purpose was to show its applicability to protect aeronautic bodies vulnerable under solid particle impact, e.g. the leading edges of the wings, the radome or the leading edges of rotor blades. The effect of operational variables on erosion rate is studied both for uncoated AA2024-T351 substrate and sol–gel-derived 7YSZ top-coat on AA2024-T351 substrate. The interactive influence of variables on erosive wear behavior is also systematically studied using an air-jet erosion tester under four different parameters such as temperature (25, 150, 275 and [Formula: see text]C), impact angle ([Formula: see text], [Formula: see text], [Formula: see text] and [Formula: see text]), impact particle velocity (40, 60, 80 and 100[Formula: see text]m/s) and erodent flow rate (2, 3, 4 and 5[Formula: see text]g/min) using L[Formula: see text] Taguchi design of experiments. The optimal experimental parameters were obtained by orthogonal arrays, signal-to-noise ratio (SNR) and analysis of variance (ANOVA) for uncoated and coated aluminum alloys AA2024-T351. The temperature was found to be the most influencing parameter followed by impact angle, impact velocity and erodent flow rate for uncoated samples. For 7YSZ sol–gel coated samples, temperature was the most influencing parameter followed by impact angle, erodent flow rate and impact velocity.

Particle Velocity Measurements to Improve Erosion Prediction

Volume 3 ◽  
2004 ◽  
Author(s):  
Matthew J. Sampson ◽  
Siamack A. Shirazi ◽  
Brenton S. McLaury
Keyword(s):  
Impact Velocity ◽  
Particle Velocity ◽  
Particle Interaction ◽  
Particle Impact ◽  
Average Particle ◽  
Rotating Disks ◽  
Erosion Testing ◽  
Erosion Prediction ◽  
Particle Velocities ◽  
Particle Impact Velocity

Previous work on Computational Fluid Dynamics (CFD) based erosion modeling indicated a strong influence of particle impact velocity on erosion. Equations to predict erosion are based on particle impacting velocity, material properties and particle characteristics such as particle shape and size. Previous studies did not measure particle velocity directly but used rotating disks or simplified computer models to determine the particle velocity. In the present work, a series of experiments have been conducted to measure the velocity of small particles (sand and aluminum) as they approach a target. A laser Doppler velocimetry system was used to measure particle velocities in a jet of air as the jet impinges a target. The angle between the target and the incoming jet is varied. Particle concentration is also controlled, allowing the effects of particle to particle interaction on average particle impact velocity to be observed. These findings are expected to improve the results of erosion testing and provide new data for improving erosion models.

Sign in / Sign up

Export Citation Format

Share Document