Flip-Flop Flow Control inside Streamwise Diverging Diamond-Shaped Cylinder Bundles with Concavities


The flow visualization work with the aid of PIV and Piezometer deals with flip-flop flow around diamond-shaped cylinder bundle revised with concavities on both bundle walls. It is disclosed that 1) the concavity constructed on both side-walls of a diamond cylinder induces a substantial change in the flow patterns in the exit jet-stream field and jet- stream dispersion, 2) pressure characteristics are quantitatively measured in a diverging-flow region in diamond cylinder bundles with concavityand in its downstream region, and 3) flip-flop flow occurs in the flow passages and its occurrence condition is obtained.

Share and Cite:

S. Torii and S. Umeda, "Flip-Flop Flow Control inside Streamwise Diverging Diamond-Shaped Cylinder Bundles with Concavities," Journal of Flow Control, Measurement & Visualization, Vol. 1 No. 3, 2013, pp. 77-85. doi: 10.4236/jfcmv.2013.13010.

Conflicts of Interest

The authors declare no conflicts of interest.


[1] H. Viets, “Flip-Flop Jet Nozzle,” AIAA Journal, Vol. 13, No. 10, 1975, pp. 1375-1379. http://dx.doi.org/10.2514/3.60550
[2] S. Umeda, S. Hasegawa and W.-J. Yang, “Occurrence of Flip-Flop Flows in Diamond-Shaped Cylinder Bundles,” Journal of Environment and Engineering, Vol. 2, No. 1, 2007, pp. 1-12. http://dx.doi.org/10.1299/jee.2.1
[3] S. Umeda, Patent No. 2841173, Japan, 1998.
[4] S. Umeda, Patent No. 4093272, Japan, 2008.
[5] N. Zhang, W.-J. Yang and Y. Xu, “Flow Characteristics in Flow Networks,” Experiments in Fluids, Vol. 14, No. 1, 1993, pp. 25-32. http://dx.doi.org/10.1007/BF00196984
[6] S, Umeda, W.-J. Yang and T. Tanaka, “Mechanics and Correlations of Flow Phenomena in Intersecting Ducts,” Experiments in Fluids, Vol. 17, No. 5, 1994, pp. 323-329. http://dx.doi.org/10.1007/BF01874412
[7] S. Umeda and W.-J. Yang, “Flow Visualization Methods in Intersecting Ducts,” Journal of Flow Visualization and Image Processing, Vol. 1, No. 3, 1993, pp. 159-170.
[8] W.-J. Yang and S. Umeda, “Coanda Effect and Its Role in Mixing in Intersecting Flow,” Proceedings of CSME FORUM SCGM 1998, Vol. 1, 1998, pp. 147-152.
[9] S. Umeda and W.-J. Yang, “Dynamic Behavior of Shear Layer in Intersecting Ducts,” 9th International Symposium on Transport Phenomena in Thermal-Fluid Engineering, Singapore, 1996, pp. 784-788.
[10] S. Umeda, W.-J. Yang and C.-S. Wu, “Reciprocating Bubble Migration and Flip-Flop Phenomena in Multiple Flow Networks,” Proceedings of 11th International Symposium on Transport Phenomena, Hsinchu, 1998, pp. 415-420.
[11] S. Umeda, A. Taniguchi, S. Hasegawa and W.-J. Yang, “Flow Instability in Diverging-Flow Region with Flip-Flop Phenomenon inside Diamond-Shaped Cylinder Bundles, FEDSM2003-45133, Honolulu, 2003, pp. 1-6.
[12] S. Umeda and W.-J. Yang, “Diagnosis of Intersecting Flow—On Visualization of Flow Networks,” Kyoritsu Publishing Co. Ltd., Tokyo, 2007, pp. 1-11.
[13] S. Umeda, K. Iijima, K. Shinmura and W.-J. Yang, “Effect of Wall Concavity on Oscillations of Jet Streams from Diamond-Shaped Cylinder Bundle,” Journal of Flow Visualization and Image Process, Vol. 18, No. 2, 2011, pp. 165-183. http://dx.doi.org/10.1615/JFlowVisImageProc.2011003481
[14] S. Umeda, “Characteristics of Intersecting Flows in Multiple Diamond-Shaped Islands,” Journal of Flow Visualization and Image Process, Vol. 8, No. 2, 2001, pp. 165- 176.
[15] S. Umeda and W.-J. Yang, “Flow Characteristics inside Diamond-Shaped Cylinder Bundles,” Proceedings of International Conference on Jets, Wakes and Separated Flows, ICJWSF-2005, 2005, pp. 539-542.
[16] S. Umeda and S. Torii, “Flip-Flop Flow Characteristics inside Streamwise Diverging Diamond-Shaped Cylinder Bundles,” Journal of Materials Science and Engineering A, Vol. 2, No. 9, 2012, pp. 616-623.
[17] Y. Ohya and T. Karasudani, “A Shrouded Wind Turbine Generating High Output Power with Wind-Lens Technology,” Energies, Vol. 3, No. 4, 2010, pp. 634-649. http://dx.doi.org/10.3390/en3040634
[18] T. Gono, T. Syuto, T. Yamagata and N. Fujisawa, “Time-Resolved Scanning Stereo PIV Measurement of Three-Dimensional Velocity Field of Highly Buoyant Jet,” Journal of Visualization, Vol. 15, No. 3, 2012, pp. 231-240. http://dx.doi.org/10.1007/s12650-012-0129-y

Copyright © 2023 by authors and Scientific Research Publishing Inc.

Creative Commons License

This work and the related PDF file are licensed under a Creative Commons Attribution 4.0 International License.