Proceedings of the SAREK Conference (대한설비공학회:학술대회논문집)

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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A Study on the Behavior of the Free Surface in a Moving Cup of Different Shape

이송되는 컵 형상에 따른 자유표면의 거동 특성에 관한 연구

  • Kim, Yun-Sun (Department of Mechanical Engineering, Graduate school, Kyung-hee University) ;
  • Hong, Tae-Hyub (Department of Mechanical Engineering, Graduate school, Kyung-hee University) ;
  • Kim, Chang-Nyung (Department of Mechanical Engineering, Kyung-hee University (Industrial Liaison Research Institute))
  • 김윤선 (경희대학교 대학원 기계공학과) ;
  • 홍태협 (경희대학교 대학원 기계공학과) ;
  • 김창녕 (경희대학교 기계공학과 (산학협력 기술연구원))
  • Published : 2009.06.25
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Abstract

A manipulator is operated for the motion of mechanical hands or arms. When a cup including liquid inside is shifted by a manipulator, it is important to know how a free surface of the liquid moves. In this study, non dimensional parameters have been found that affect the rise of the free surface in a cup moving with constant acceleration. The non-dimensional parameters are the dimensionless time, the ratio of inertia effect to viscous effect (the Reynolds number), aspect ratio of the liquid inside the cup and the acceleration ratio (the Froude number). Through this study, the height of the free surface rise in a cup has been predicted and the detailed velocities in the liquid have been examined. Generally, the maximum rise of the free surface is dependent on the Reynolds number and Froude number strongly, but on the aspect ratio weakly. However, the influence of the aspect ratio on the maximum rise of the free surface is not negligible in the range of 10 < Re < 100.

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