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Uni-flow type vortex tube의 저온공기유량비 변화에 따른 미세입자 분리특성 해석 연구
서원준(Wonjun Seo),손성진(Seongjin Son),류혜림(Hyerim Ryu),임석연(Seokyeon Im) 한국자동차공학회 2022 한국자동차공학회 지부 학술대회 논문집 Vol.2022 No.5
Vortex tube shows excellent energy separation effect and is currently being used as a cooler in the industrial field. In addition, if the vortex tube uses an internal flow, a centrifugal effect similar to that of a cyclone dust collector can be obtained. However, studies on the separation of solid particles utilizing the internal flow characteristics of the vortex tube are insufficient. In this study, to utilize a vortex tube for fine particle separation, numerical simulations were used to compare and analyze the fine particle separation efficiency according to the uni-flow type cold flow ratio. As a result of the simulation, all particles were discharged to the high temperature outlet end along Hie tangent of the tube wall without the effect of cold flow fraction and particle size.
초음파 센서의 1차 정합층 두께에 따른 가스탱크 미세누설 수신특성
서원준(Wonjun Seo),손성진(Seongjin Son),임석연(Seokyeon Im) 한국트라이볼로지학회 2021 한국트라이볼로지학회지 (Tribol. Lubr.) Vol.37 No.5
Ultrasonic sensors show various reception characteristics based on the density of the measurement medium; hence, they are used in various fields to benefit from the characteristics of ultrasonic signals. In this study, the reception characteristics according to the thickness of the first matching layer are compared and analyzed for application to gas tank microleak detection. Accordingly, three types of sensors are manufactured with varying thicknesses of the first matching layer, namely 4.8 mm, 5.1 mm, and 5.5 mm; further, a direct measurement method is used wherein the sensor is attached to the inside of the chamber. Experiments are conducted to observe the phase change due to microleakage, which is the most linear in the sensor with the 4.8 mm thick first matching layer. This is assumed to be the result of stable signal transmission and reception with little phase deviations over time because the first matching layer is closest to the ultrasonic wavelength. The other sensors show nonlinear results with increasing thickness of the first matching layer. Through this study, it is found that appropriately selecting the thickness of the first matching layer of the ultrasonic sensor can greatly influence sensor reliability.