Abstract
Experiments are performed on swirling water flow in a vertical circular tube. This kind of flow is used in heat exchangers, combustion chambers, thermal power plants, and other mechanical equipment to move slurries or to convey materials. However, limited information on swirling flow in vertical circular tubes is available. In this paper, three-dimensional particle image velocimetry technique has been employed to measure velocities profiles in water along the vertical circular tube and then compared those of without swirl.
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Abbreviations
- D :
-
Diameter of the swirl chamber (mm)
- L :
-
Length of the test tube(mm)
- R :
-
Radial position of the test tube (mm)
- Re :
-
Reynolds number based on the diameter of the tube and the time mean velocity in the tube
- (X, Y, Z):
-
Cartesian coordinate
- V n :
-
Non-dimensional velocity
- V z :
-
Time-averaged velocity for Z-direction (m/s)
- d :
-
Diameter of the test tube (mm)
- L :
-
Axial distance of the swirl chamber (mm)
- R :
-
Radius of the test tube (mm)
- Z :
-
Coordinate along the length of the test tube
- V r :
-
Time-averaged velocity for r-direction (m/s)
- u’,v’,w’:
-
Axial, radial, tangential fluctuating velocity
- S :
-
Swirl number \( \left( { = 1/R\left[ {\int_{0}^{r} {V_{\theta } V_{z} r^{2} {\text{d}}r} /\int_{0}^{r} {V_{z}^{2} r{\text{d}}r} } \right]} \right) \)
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Acknowledgments
This study was supported financially by the Ministry of Education, Science, and Technology along with the Korean Institute of Science and Technology Information as a result of the RESEAT Program. It was also supported by the National Research Foundation Grant funded by the Korean Government (MEST) (No. 2008-0060153).
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Chang, TH., Doh, D.H. & Oh, K.J. Velocity profiles with swirling flow in a vertical circular tube. J Vis 16, 53–64 (2013). https://doi.org/10.1007/s12650-012-0145-y
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DOI: https://doi.org/10.1007/s12650-012-0145-y