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dc.contributor.authorTseng, Chi-Shanen_US
dc.contributor.authorChen, Chun-Mingen_US
dc.contributor.authorWang, Chi-Chuanen_US
dc.date.accessioned2014-12-08T15:34:45Z-
dc.date.available2014-12-08T15:34:45Z-
dc.date.issued2013-12-01en_US
dc.identifier.issn0735-1933en_US
dc.identifier.urihttp://dx.doi.org/10.1016/j.icheatmasstransfer.2013.10.007en_US
dc.identifier.urihttp://hdl.handle.net/11536/23657-
dc.description.abstractIn this study, the flow pattern and pressure variation of the nozzles applicable to high power laser cutting and welding were studied. A total of five nozzles are made and tested with nozzle diameter ranging from 0.8 to 4 mm. The depth of focus and the width of focus are measured based on the flow visualization. It is found that the depth of focus is increased with the rise of exit Mach number while the width of focus is increased with the nozzle diameter. The visual results indicate that the supersonic nozzle reveals a more concentrated jet flow pattern even the flow has passed through the depth of focus. On the other hand, appreciate deviation of the flow pattern is observed for the subsonic nozzle after the depth of focus. As far as more concentrated air flow pattern is concerned, a supersonic nozzle with an exit diameter less than 3.0 mm is recommended. The total pressure decreasing tremendously with the exit Mach number is encountered while moderate decline of the static and dynamic pressure for supersonic nozzles is seen. However, its corresponding dynamic pressure is still higher than that of the subsonic nozzle. (C) 2013 Elsevier Ltd. All rights reserved.en_US
dc.language.isoen_USen_US
dc.subjectVisual observationen_US
dc.subjectNozzleen_US
dc.subjectCutting and weldingen_US
dc.titleA visual observation of the air flow pattern for the high speed nozzle applicable to high power laser cutting and weldingen_US
dc.typeArticleen_US
dc.identifier.doi10.1016/j.icheatmasstransfer.2013.10.007en_US
dc.identifier.journalINTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFERen_US
dc.citation.volume49en_US
dc.citation.issueen_US
dc.citation.spage49en_US
dc.citation.epage54en_US
dc.contributor.department工學院zh_TW
dc.contributor.departmentCollege of Engineeringen_US
dc.identifier.wosnumberWOS:000329560500008-
dc.citation.woscount0-
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