Effects of Focus Geometry on the Hard Rock-Cutting Performance of an Abrasive Waterjet
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 d...
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| Format: | Article |
| Language: | English |
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Wiley
2020-01-01
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| Series: | Advances in Civil Engineering |
| Online Access: | http://dx.doi.org/10.1155/2020/1650914 |
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| author | Yohan Cha Tae-Min Oh Gye-Chun Cho |
| author_facet | Yohan Cha Tae-Min Oh Gye-Chun Cho |
| author_sort | Yohan Cha |
| collection | DOAJ |
| description | 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. |
| format | Article |
| id | doaj-art-254d346058b7436283acfe9a222ef4ba |
| institution | Kabale University |
| issn | 1687-8086 1687-8094 |
| language | English |
| publishDate | 2020-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Civil Engineering |
| spelling | doaj-art-254d346058b7436283acfe9a222ef4ba2025-02-03T05:53:25ZengWileyAdvances in Civil Engineering1687-80861687-80942020-01-01202010.1155/2020/16509141650914Effects of Focus Geometry on the Hard Rock-Cutting Performance of an Abrasive WaterjetYohan Cha0Tae-Min Oh1Gye-Chun Cho2Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of KoreaDepartment of Civil Engineering, Pusan National University, Pusan 46241, Republic of KoreaDepartment of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of KoreaAbrasive 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.http://dx.doi.org/10.1155/2020/1650914 |
| spellingShingle | Yohan Cha Tae-Min Oh Gye-Chun Cho Effects of Focus Geometry on the Hard Rock-Cutting Performance of an Abrasive Waterjet Advances in Civil Engineering |
| title | Effects of Focus Geometry on the Hard Rock-Cutting Performance of an Abrasive Waterjet |
| title_full | Effects of Focus Geometry on the Hard Rock-Cutting Performance of an Abrasive Waterjet |
| title_fullStr | Effects of Focus Geometry on the Hard Rock-Cutting Performance of an Abrasive Waterjet |
| title_full_unstemmed | Effects of Focus Geometry on the Hard Rock-Cutting Performance of an Abrasive Waterjet |
| title_short | Effects of Focus Geometry on the Hard Rock-Cutting Performance of an Abrasive Waterjet |
| title_sort | effects of focus geometry on the hard rock cutting performance of an abrasive waterjet |
| url | http://dx.doi.org/10.1155/2020/1650914 |
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