서지주요정보
중심 공기류가 있는 환상 액막의 유동 및 미립화 특성 연구 = Study of flow and atomization xharacteristics of annular liquid sheet with Core-Air flow
서명 / 저자 중심 공기류가 있는 환상 액막의 유동 및 미립화 특성 연구 = Study of flow and atomization xharacteristics of annular liquid sheet with Core-Air flow / 최철진.
발행사항 [대전 : 한국과학기술원, 2004].
Online Access 원문보기 원문인쇄

소장정보

등록번호

8015437

소장위치/청구기호

학술문화관(문화관) 보존서고

DME 04006

휴대폰 전송

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반납예정일

리뷰정보

초록정보

In the present work, the mechanism of drop formation from a thin hollow liquid (water) jet with a high-velocity core-gas (air) flow was examined. The breakup modes were identified from the high-speed spark photography. There exist at least three different modes of disintegration, namely, Rayleigh, bubble-breakup, and pure-pulsating modes depending on the air and water flow rates. Tentative maps representing those disintegration modes were proposed with the liquid film Reynolds number and the aerodynamic Weber number taken as the dimensionless parameters. Spray configuration was visualized and mean (cross-section-averaged) SMD radial distribution of local SMD and volume concentration of drops were measured for various liquid and gas injection velocities and for annulus-gap clearances (0.2 - 0.8 mm). The atomization quality was improved with the higher flow rate of the atomizing gas; however, the dependence of drop size on the liquid flow rate was complicated. With the increase in liquid flow rate, the mean SMD first increased and then decreased, and increased again, up to the maximum, followed by the second decreasing range. Flow regimes (laminar or turbulent) and the momentum strengths of the liquid and the gas streams, and their combinations, were considered as the primary factors determining the overall atomization characteristics. The aerodynamic force was proven to be dominant in the first three ranges of the liquid flow rate, while the hydrodynamic force predominated in the last range. The variation trend of the mean SMD gradually disappeared with the decrease in the liquid sheet thickness. When the sheet thickness decreased to 0.2 mm, the mean SMD simply increased with the increase in liquid flow rate.

서지기타정보

서지기타정보
청구기호 {DME 04006
형태사항 xiv, 134 p. : 삽도 ; 26 cm
언어 한국어
일반주기 부록 : 단면평균입경 계산식의 유도
저자명의 영문표기 : Chul-Jin Choi
지도교수의 한글표기 : 이상용
지도교수의 영문표기 : Sang-Yong Lee
수록잡지명 : "Droplet formation from a thin hollow liquid jet with a core-air flow". Atomization and sprays, v.14,(2004)
학위논문 학위논문(박사) - 한국과학기술원 : 기계공학전공,
서지주기 참고문헌 : p. 126-131
주제 환상 액막
중공 분류
중심 공기류
분열 모드
액막 두께
ANNULAR LIQUID SHEET
HOLLOW JET
CORE-AIR FLOW
DISINTEGRATION MECHANISM
SHEET THICKNESS
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