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송민근(Mingeun Song),이경렬(Kyungyoul Lee),나우정(WooJung La),주은선(Eunsun Ju) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
Characteristics of the twin fluid spray with ultrasonic forcing are examined in order to obtain the high efficiency of cold fog spray of the automatic pest control machine which has been widely used for the equipment cultivation recently.<br/> An electrostrictive vibrator of PZT BLT and a magnetostrictive vibrator of π type with 28kHz are<br/> applied as the ultrasonic transducer. All experiments are made and observed in 4 methods of spray ; a conventional spray method without ultrasonic forcing, an indirect vibration method with ultrasonic forcing. an improving quality method by ultrasonic forced within liquid. and a combined use method with both of the indirect vibration method and the improving quality method. In results, It was clarified that the ultrasonic effects the atomization of spray droplets and especially much more in the case of the combined use method.
超音波가 加振된 圓形제트의 流動解析을 爲한 디지털 映像處理技法의 適用에 關한 硏究
송민근,정광수,구자훈,주은선 慶尙大學校生産技術硏究所 1999 生産技術硏究所論文集 Vol.15 No.-
Enhancement of turbulent flow is needed to increase the efficiency of heat transfer between fuel bundles and coolant in the nuclear reactor. The analysis of flow within a coaxial circular pipe by a jet pump to supply coolant and the method of turbulent flow enhancement with minimum power losses have to be investigated. In this study, the application of the digital imaginary method to analyze characteristics of the circular jet flow has been established and a method to enhance turbulent flow researched with adding ultrasonic vibration. In results, characteristics of flow such as velocity distribution, entrainment, vortex, separation, reattachment, and time mean kinetic energy were obtained and the efficiency of turbulent flow enhancement by ultrasonic vibration was examined.
주은선,송민근,구자훈,정광수 慶尙大學校生産技術硏究所 1999 生産技術硏究所論文集 Vol.15 No.-
A Study on characteristics of the internal flow in a circular pipe by ultrasonic sound pressure was carried out with a 28kHz PZT BLT. In order to investigate the flow characteristics according to the liquid load, the Langevin bolted transducer was set in an acrylic tube as a piston type without liquid leakage. Phenomena of the internal flow of liquid were measured at 3 load levels by PIV. Velocity vector, velocity profile and turbulent kinetic energy distribution were visualized and observed. In results, several internal flow characteristics by ultrasonic vibrations were examined.