The stability of 30µm diameter water-jet for jet guided laser machining
Combined water-jet process and laser machining, the water-jet guided laser processing is suitable in processing thin and sensitive material with a high degree of precision required Given that the stability of water-jet has direct effects on machining quality, a numeral model of J0,1.1m wate...
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| Format: | Theses and Dissertations |
| Language: | English |
| Published: |
2015
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| Subjects: | |
| Online Access: | http://hdl.handle.net/10356/65150 |
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| Institution: | Nanyang Technological University |
| Language: | English |
| Summary: | Combined water-jet process and laser machining, the water-jet guided laser processing
is suitable in processing thin and sensitive material with a high degree of precision
required Given that the stability of water-jet has direct effects on machining quality, a
numeral model of J0,1.1m water-jet, considering the number of grids and the influence of
meshes, has been built with GAMBIT in order to meet the requirements of micrometer
order precision machining. Furthermore, the critical Reynolds number and the critical
exit jet velocity of the case with J0,1.1m nozzle diameter have been found to make a
comparison of turbulence flow and laminar flow with different exit jet velocities. Hence,
the optimal exit jet velocity to get longest stable length of water-jet was found. A case of
15m/s is simulated in different degrees of vacuum, which suggests water-jets in vacuum
are much more stable than those in atmospheric environment. Finally, a conjecture
about water-jet simulation with smaller diameter of nozzle and the optimal chemical
material of water-jet are proposed as future work.
Keywords: Micro-water-jet guided laser; Stability of jet; CFD |
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