In order to investigate the polymer effect on grid turbulence, the experiments study on grid turbulence has been built based on Particle Image Velocimetry. The Newtonian fluid flow and 200ppm polymer solution flow in grid turbulence were carried out at different grid oscillating frequency, such as 5Hz, 7.5Hz, 10Hz and 12.5Hz. The experimental results show that the viscous dissipation rate and vortex vector ωz is smaller and more regular in space distribution in polymer solution case at grid oscillating frequency with 5Hz. It indicates that the existence of polymer additives inhibits enormously the viscous dissipation rate and vortex vector, but this phenomenon can be attenuated with the increase of grid oscillating frequency. From this result, it shows that there exists a critical Reynolds number for the inhibition of polymer effect, which is the same as that in turbulent channel flows with polymers. Then, proper orthogonal decomposition (POD) has been used to extract coherent structures in grid turbulence. It is found that it needs 24 and 4 POD eigenfunctions to examine coherent structure in the Newtonian fluid and the polymer solution cases respectively at grid oscillating frequency with 10Hz. It suggests that the coherent structures can be inhibited due to the existence of polymers so as to the flow field to be more regular. But, with the increase of grid oscillating frequency, the number of POD eigenfunctions for the Newtonian fluid case and the polymer solution case respectively are approaching the same. Through this analysis, it can be also seen that the inhibition effect of polymers is close relation with the grid oscillating frequency.
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ASME/JSME/KSME 2015 Joint Fluids Engineering Conference
July 26–31, 2015
Seoul, South Korea
Conference Sponsors:
- Fluids Engineering Division
ISBN:
978-0-7918-5721-2
PROCEEDINGS PAPER
Experimental Study on Two-Oscillating Grid Turbulence With Polymer Additives
Yue Wang,
Yue Wang
Harbin Institute of Technology, Harbin, Heilongjiang, China
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Wei-Hua Cai,
Wei-Hua Cai
Harbin Institute of Technology, Harbin, Heilongjiang, China
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Tong-Zhou Wei,
Tong-Zhou Wei
Harbin Institute of Technology, Harbin, Heilongjiang, China
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Lu Wang,
Lu Wang
Harbin Institute of Technology, Harbin, Heilongjiang, China
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Feng-Chen Li
Feng-Chen Li
Harbin Institute of Technology, Harbin, Heilongjiang, China
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Yue Wang
Harbin Institute of Technology, Harbin, Heilongjiang, China
Wei-Hua Cai
Harbin Institute of Technology, Harbin, Heilongjiang, China
Tong-Zhou Wei
Harbin Institute of Technology, Harbin, Heilongjiang, China
Lu Wang
Harbin Institute of Technology, Harbin, Heilongjiang, China
Feng-Chen Li
Harbin Institute of Technology, Harbin, Heilongjiang, China
Paper No:
AJKFluids2015-7904, V001T15A008; 6 pages
Published Online:
November 20, 2015
Citation
Wang, Y, Cai, W, Wei, T, Wang, L, & Li, F. "Experimental Study on Two-Oscillating Grid Turbulence With Polymer Additives." Proceedings of the ASME/JSME/KSME 2015 Joint Fluids Engineering Conference. Volume 1: Symposia. Seoul, South Korea. July 26–31, 2015. V001T15A008. ASME. https://doi.org/10.1115/AJKFluids2015-7904
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