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피드백이 없는 유체진동기에서 분사되는 Sweeping jet의 유동 특성

Flow Characteristics of Sweeping Jet Issued by a Feedback-free Fluidic Oscillator

  • Nam, Sanghyun (School of Mechanical Engineering, Pusan National University) ;
  • Kim, Donguk (School of Mechanical Engineering, Pusan National University) ;
  • Kim, Kyung Chun (School of Mechanical Engineering, Pusan National University)
  • 투고 : 2020.03.23
  • Accepted : 2020.04.24
  • Published : 2020.04.30

Abstract

This paper presents flow characteristics of a sweeping jet issued by a feedback-free fluidic oscillator. Overall flow characteristics of feedback-free sweeping jet (FFSJ) were analyzed using flow visualization. The feedback-free sweeping jet has a sinusoidal external flow pattern. The oscillating frequency of the FFSJ is three times higher than that of a conventional sweeping jet at the same Reynolds number. Flow structure and turbulence characteristics were investigated using time-resolved particle image velocimetry (TR-PIV). In instantaneous velocity fields, the flow did not stay at ends but changed the direction continuously in contrast to the conventional sweeping jet. Velocity distributions at each plane which were extracted from mean velocity field has Gaussian distribution, which is similar with a circular jet. The sweep angles were constant as 45° at all Reynolds numbers in the high flow rate regime.

Keywords

References

  1. N. Zuckerman, N. Lior, 2006, "Jet impingement heat transfer: physics, correlations, and numerical modeling", Adv. Heat Transf. 39, 565-631. https://doi.org/10.1016/S0065-2717(06)39006-5
  2. H. Wang, W. Yu, Q. Cai, 2012, "Experimental study of heat transfer coefficient on hot steel plate during water jet impingement cooling", J. Mater. Process. Technol. 212 (9) 1825-1831. https://doi.org/10.1016/j.jmatprotec.2012.04.008
  3. P.A. de Oliveira, J.R. Barbosa Jr., 2017, "Novel two-phase jet impingement heat sink for active cooling of electronic devices", Appl. Therm. Eng. 12, 952-964.
  4. Laroche, E., Fenot, M., Dorignac, E., Vuillerme, J., Brizzi, L. E., Larroya, J. C., 2017, "A combined experimental and numerical investigation of the flow and heat transfer inside a turbine vane cooled by jet impingement", J. Turbomach 140(3), 031002 (9 pages)
  5. M. Koklu, 2016, "Effect of a Coanda extension on the performance of a sweeping-jet actuator", AIAA J. 54 (3), 1131-1134. https://doi.org/10.2514/1.J054448
  6. S. Raghu, 2001, "Feedback-free fluidic oscillator and method," U.S. patent 6,253,782 (3 July 2001).
  7. H. Martin, 1997, Heat and mass transfer between impinging gas jets and solid surfaces, Adv. Heat Transf. 13, 1-60.
  8. K. Jambunathan, E. Lai, M.A. Moss, B.L. Button, 1992, A review of heat transfer data for single circular jet impingement, Int. J. Heat Fluid Flow 13, 106-115. https://doi.org/10.1016/0142-727X(92)90017-4
  9. X. Wen, Y. Liu, H. Tang, 2018, Unsteady behavior of a sweeping impinging jet: time-resolved particle image velocimetry measurements, Exp. Therm. Fluid Sci. 96, 111-127 https://doi.org/10.1016/j.expthermflusci.2018.02.033
  10. S.H. Kim, H.D. Kim (2019), Quantitative visualization of the three-dimensional flow structures of a sweeping jet, Journal of Visualization, 22:437-447 https://doi.org/10.1007/s12650-018-00546-1
  11. S.H. Kim, H.D. Kim, K.C. Kim, 2019, "Measurement of two-dimensional heat transfer and flow characteristics of an impinging sweeping jet", Int. J. Heat Mass Transf. 136, 415-426. https://doi.org/10.1016/j.ijheatmasstransfer.2019.03.021
  12. W. Zhou, L. Yuan, Y. Liu, D. Peng, X. Wen, 2019, Heat transfer of a sweeping jet impinging at narrow spacings, Experimental Thermal and Fluid Science 103, 89-98. https://doi.org/10.1016/j.expthermflusci.2019.01.007
  13. M. Sitter, 2015, Internal flow of fluidic oscillators: A numerical and experimental investigation, Master of Science Thesis
  14. J. W. Gregory, J. P. Sullivan, and S. Raghu, 2005, Visualization of jet mixing in a fluidic oscillator, J. Visualization 8, 169-176 https://doi.org/10.1007/BF03181660
  15. Tomac, M. N. and J. W. Gregory, 2018, Oscillation characteristics of mutually impinging dual jets in a mixing chamber, Physics of Fluids 30 (11).