Journal of computational fluids engineering (한국전산유체공학회지)

Korean Society of Computational Fluids Engineering (한국전산유체공학회)
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STUDY ON THE BEHAVIOR OF NEEDLES AND SPRINGS FALLING FREELY IN A VISCOUS FLUID

점성 유체중에 자유낙하 하는 니들과 스프링의 거동에 관한 연구

  • Gowtham, B. (Dept. of Mechanical Engineering, Dong-A University) ;
  • Suh, Y.K. (Dept. of Mechanical Engineering, Dong-A University)
  • 고담 (동아대학교 기계공학과) ;
  • 서용권 (동아대학교 기계공학과)
  • Received : 2014.01.14
  • Accepted : 2014.05.20
  • Published : 2014.06.30
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Abstract

We report in this paper the analysis of the motion of a needle and a spring in a viscous fluid under the influence of gravitational force. Lateral shift as well as vertical motion of a needle falling in a viscous fluid has been observed from a simple experiment. We also observed the combined rotation and translation of a falling spring. The trajectory and velocity of the falling needle and the spring were obtained by using an image processing technique. We also conducted numerical simulation for both problems. For the falling-needle problem, we employed a theory; but it turns out that significant correction is required for the solutions to match the numerical and experimental data. For the falling spring problem various theoretical formula were tested for their justification, but none of the existing theories can successfully predict the numerical and experimental results.

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