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Effects of Focus Geometry on the Hard Rock-Cutting Performance of an Abrasive Waterjet
- Source :
- Advances in Civil Engineering, Vol 2020 (2020)
- Publication Year :
- 2020
- Publisher :
- Hindawi Limited, 2020.
-
Abstract
- Abrasive waterjets are being increasingly used in civil engineering for rock and concrete cutting, particularly for the demolition or repair of old structures. The energy of an abrasive waterjet is primarily provided by the accelerated abrasive. The momentum transfer during mixing and acceleration determines the abrasive velocity, which affects the cutting performance. Meanwhile, the geometry of the focus at which mixing occurs influences the momentum transfer efficiency. In this study, the effects of the focus geometry on the optimum abrasive flow rate (AFR) and momentum transfer characteristics in hard rock cutting were investigated. Experiments were conducted using granite specimens to test the AFR under different focus geometry conditions such as diameter and length. The results show that the focus geometry significantly affects the maximum cutting depth and optimum AFR. The maximum cutting energy was analyzed based on the cutting efficiency of a single abrasive particle. In addition, the momentum transfer parameter (MTP) was evaluated from the empirical relationship between the maximum energy and the cutting depth for granitic rocks. Accordingly, a model for estimating the MTP based on the AFR was developed. It is expected that the results of this study can be employed for the optimization of waterjet rock cutting.
- Subjects :
- Materials science
Article Subject
Granitic rock
Momentum transfer
Abrasive
0211 other engineering and technologies
Mixing (process engineering)
Mechanical engineering
02 engineering and technology
Engineering (General). Civil engineering (General)
010502 geochemistry & geophysics
01 natural sciences
Rock cutting
Volumetric flow rate
Acceleration
Particle
TA1-2040
021101 geological & geomatics engineering
0105 earth and related environmental sciences
Civil and Structural Engineering
Subjects
Details
- ISSN :
- 16878094 and 16878086
- Volume :
- 2020
- Database :
- OpenAIRE
- Journal :
- Advances in Civil Engineering
- Accession number :
- edsair.doi.dedup.....98b937ba6af46761c46f14915e8f4bbc