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Spark-generated bubble collapse near or inside a circular aperture and the ensuing vortex ring and droplet formation

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Acta Mechanica Sinica 2013年第5期29卷 657-666页

作者： Abdolrahman Dadvand Mazyar Dawoodian Boo Cheong Khoo Reza Esmaily Department of Mechanical Engineering Urmia University of Technology*** Urmia Iran Faculty of Engineering Department of Mechanical EngineeringNational University of Singapore10 Kent Ridge CrescentSingapore 119260 Singapore Sama Technical and Vocational Training College IAU Mahabad BranchMahabad Iran

This paper aims to study the oscillation of a sparkgenerated submerged bubble located near or inside a circular aperture made in a flat plate using high-speed visualization technique. In the case of a bubble oscillating near an aperture the initial free surface of the water was set at the bottom surface of the plate. The effects of aperture size and bubblefree surface distance on the bubble behavior as well as on the ensuing droplet dynamics are investigated. It was found that the direction of the bubble reentrant jet was towards the aperture or away from it respectively when the normalized aperture size was smaller or greater than a certain critical value. In addition, a toroidal vortex ring was observed to form, which rotated inwards as it moved away from the aperture. It was also found that if the bubble was incepted at a distance sufficiently away from a supercritical size aperture a single droplet could be produced. In the case of a bub- ble initiated in the middle of a circular aperture submerged just beneath the water free surface, the bubble was found to take the shape of an ellipsoid during its expansion. Then a reentrant jet was initiated and pierced the bubble from its top side.

关键词： Spark bubble Toroidal bubble Vortex ring Droplet formation high-speed video camera

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Influence of longitudinal magnetic field on metal transfer in MIG arc welding

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China Welding 2008年第2期17卷 27-31页

作者：常云龙车小平贺优优胡广旭 School of Material Science and Engineering Shenyang University of Technology

Metal transfer is an important phenomenon in metal inert gas （MIG） arc welding with longitudinal alternating magnetic field. It is of great significance to observe the metal transfer modes under different excitatory currents and frequencies. However, it is very difficult to view the metal transfer process directly during welding, due to the strong interference from the arc light. To obtain the relationship between the metal transfer modes and the different magnetic fields, a high-speed video camera was used to acquire the images of globules. Different metal transfer modes under the conditions of different magnetic fields and welding parameters were studied. The experiment shows clear images of droplet transfer as well as influence of longitudinal magnetic field on both metal transfer and globule shape.

关键词： high-speed video camera metal transfer longitudinal magnetic field

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Evaluation of Skills in Swing Technique in Classical Japanese Swordsmanship in laido Using Sensors

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Journal of Mechanics Engineering and Automation 2016年第4期6卷 190-196页

作者： Satoru Okamoto Satomi Adachi Interdisciplinary Graduate School of Science and Engineering Shimane University Matsue 690-8504 Japan Department of Social Informatics Graduate School of Informatics Kyoto University Kyoto 606-8501 Japan

In this study, we analyzed the swing motions of more experienced practitioner and new practitioner of iaido players by using tri-axial acceleration sensor and gyro sensor. Iaido is a modern Japanese martial art/sport. In this way, the acceleration and gyro sensor measurement enabled detailed motion information at the installation points to be displayed in a short time, thus making it possible to easily extract the objective problems. Although it was not possible to confirm by the acceleration and angular velocity measurements the detailed motion of the entire body as obtained in the 2D motion analysis with a high-speed camera, it was confirmed that the acceleration and gyro sensor is an evaluation means that can be installed easily and can provide the exercise information in a short time as an objective index.

关键词： Skill science classical Japanese swordsmanship in iaido acceleration sensor high-speed video camera gyro sensor.

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