The fragmentation mechanism of coal impacted by water jets and abrasive jets

Xue, Yongzhi; Si, Hu; Chen, Guohua

doi:10.1016/j.powtec.2019.11.018

Cited by 43 publications

(14 citation statements)

References 28 publications

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“…13 Leading to the actual rock-breaking mechanism is controversially discussed in the previous studies. 14 Jiang et al 15 used numerical simulation methods to model the rock fragmentation through jet impinging and studied the rock fragmentation zone and the fracture formation as well as other failure mechanisms. Lu et al 16 analyzed the failure characteristics of sandstone and limestone under the impact of highspeed water jet.…”

Section: Introductionmentioning

confidence: 99%

“…However, the real-time transparency of the water jet rock-breaking process is low, and the flow field structure of the water jet and the damage process of the rock are very complicated . Leading to the actual rock-breaking mechanism is controversially discussed in the previous studies . Jiang et al used numerical simulation methods to model the rock fragmentation through jet impinging and studied the rock fragmentation zone and the fracture formation as well as other failure mechanisms.…”

Section: Introductionmentioning

confidence: 99%

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Fracture Characteristics and Failure Modes of Coal, Sandstone, and Shale Impacted by Water Jet under True Triaxial Conditions

Gao

Zhou

et al. 2022

Energy Fuels

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In recent years, the water jet technology has become an important means for processing unconventional oil and gas resources. With the exploitation of resources to the deep development, the study of the fracture characteristics and failure modes of true triaxial water jet rock breaking is of major importance for the application of the water jet technology in deeper crustal levels. We selected three typical unconventional gas reservoirs, coal, sandstone, and shale, as samples for our rockbreaking experiments of water jet under true triaxial conditions. On the basis of the rock failure criterion considering triaxial stress, we establish the rock-breaking energy criterion of water jet under true triaxial conditions and study the rock-breaking mode of water jet under true triaxial conditions. Experimental results document that the true triaxial water jet rock-breaking energy criterion can predict the rock-breaking threshold pressure well. With the increase of triaxial stress, the breaking threshold pressure of coal, sandstone, and shale increased by 92, 38, and 37%, respectively. Under true triaxial conditions, the failure characteristics and failure modes of different rocks impacted by water jet differ significantly. The water wedge action of coal is weakened, the volume of the crushing pit was reduced by 90%, and the failure is mainly caused by the shear failure that is induced by jet pressure. Sandstone is still dominated by the denudation failure that is caused by jet, but the degree of destruction is weakened, and the volume of the crushing pit was reduced by 38%. The shale has changed from tensile failure that is dominated by stress waves to erosion pit failure that is dominated by shear action. The results of the study provide a reference for the application of the water jet technology for the exploitation of unconventional oil and gas resources in deeper crust levels.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fracture Characteristics and Failure Modes of Coal, Sandstone, and Shale Impacted by Water Jet under True Triaxial Conditions

Gao

Zhou

et al. 2022

Energy Fuels

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“…Numerical simulation was effectively applied to describe the impact of water jets on objects. 11,12 Among a series of numerical simulation methods, ALE method had attracted researchers working in this area of research. The ALE method is an organic combination of the Lagrangian and the Euler methods.…”

Section: Introductionmentioning

confidence: 99%

Identifying the processes and characterizing the pressure zone of water jet impacting on solid surface

Zhang

Kou

et al. 2022

Advances in Mechanical Engineering

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The difficulty in understanding the flow characteristics of water jets impacting on solid surfaces made the water jet technology requiring further investigations. The Arbitrary Lagrange-Euler (ALE) method is used to develop a numerical model of the water jet impacting on a solid surface. It is also utilized in describing the flow characteristics of water and the pressure evolution in water during the impact process, understanding the formation mechanism of the pressure zone, and clarifying the influence factors of the stagnation pressure zone. The results showed that the pressure zone was characterized by the shock wave produced by the water jet impacting the solid surface. When the shock wave was contained in the water, it was the water hammer pressure stage. However, when the shock wave in water was disappeared, the stage was identified as the stagnation pressure. Besides, the water hammer pressure caused a high speed radial jet, and the stagnation pressure resulted in a low speed and stable radial jet. The stagnation pressure zone was the self-buffer zone of the water jet impacting the object, and the geometric characteristics of this zone were affected by the water jet diameter and the impact angle.

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“…An experiment was conducted on carbon fibre reinforced polymer (CFRP) 26 and borosilicate glass to find out the effect of SOD, pressure and grain size on MRR and TA using AJM. 27,28 A comparative model 29 was established to investigate the effect of water jet and abrasive jet on the texture of machining area of coal. The effect of simulated input parameters had been investigated by using analysis of variance (ANOVA), grey relational analysis (GRA) in order to evaluate the displacement of cut, kerf width (both top and bottom), surface roughness and machinability using machining parameters i.e., jet pressure, traverse speed, feed rate, SOD on titanium alloys i.e., Ti6AL4V and other brittle materials using garnet abrasive in the abrasive water jet machining (AWJM).…”

Section: Introductionmentioning

confidence: 99%

Experimental and simulation approach of surface generation on K-80 alumina ceramic by recently developed sustainable FB-HAJM using novel nozzle design

Pradhan

Dhupal

2022

Proceedings of the Institution of Mechanical Engineers, Part E:

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K-80 alumina ceramic makes it challenging to machine them economically due to extreme hardness. Fluidized bed-hot abrasive jet machining (FB-HAJMing), in which a target profile is eroded by the impingement action of air-hot abrasive jet, which containing fine hot abrasive grains for machining of K-80 alumina ceramic materials without thermal damage. This study is intended to analyse kerf angle (KA), surface roughness (Rz) and material removal rate (MRR) using HAJMing process of K-80 alumina ceramic. Fifteen sets of experimental trials were conducted two times using tungsten carbide (WC) nozzle with and without internal thread. The identified three cutting parameters i.e., air pressure (P), abrasive temperature (T) and stand-off-distance (SOD), were considered for experimental design. Furthermore, the response surface methodology (RSM), statistical techniques (here, desirability function approach) followed by computational approach (here, genetic algorithm) are respectively employed for experimental investigation, predictive modelling and multi-objective optimization. Subsequently, confirmation tests evaluate the efficiency of the suggested two multi---objective optimization methods to rationalize the utility and awareness of the usefulness of hot abrasives in HAJMing. Moreover, computational fluid dynamics (CFD) modelling was utilized to develop a comprehensive relation between HAJMed profile geometry and erosive flow. Finally, the environmental ‘Pugh Matrix’ approach is proposed for the HAJMing process sustainability evaluation. The results indicated a desire to improve the cutting efficiency for material erosion by using hot abrasives in the HAJMing procedure. The most important parameter for surface roughness is abrasive temperature, while pressure is important for both KA and MRR. The use of hot abrasives in the FB-HAJM process has demonstrated a focus on improving the cutting performance for material removal. From an economic standpoint, the current study presents a technological criterion for feasible industrial applications of the FB-HAJM method, such as in aerospace, precision manufacturing, and biomedical field.

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The fragmentation mechanism of coal impacted by water jets and abrasive jets

Cited by 43 publications

References 28 publications

Fracture Characteristics and Failure Modes of Coal, Sandstone, and Shale Impacted by Water Jet under True Triaxial Conditions

Fracture Characteristics and Failure Modes of Coal, Sandstone, and Shale Impacted by Water Jet under True Triaxial Conditions

Identifying the processes and characterizing the pressure zone of water jet impacting on solid surface

Experimental and simulation approach of surface generation on K-80 alumina ceramic by recently developed sustainable FB-HAJM using novel nozzle design

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