Abstract
An experimental investigation was conducted to study the characteristics of turbulent swirling flow in an axisymmetric annuli. The swirl angle measurements were performed using a flow visualization technique using smoke and dye liquid for Re = 60,000–80,000. Using the two-dimensional particle image velocimetry method, this study found the time-mean velocity distribution and turbulent intensity in water with swirl for Re = 20,000, 30,000, and 40,000 along longitudinal sections. There were neutral points for equal axial velocity at y/(R − r) = 0.7–0.75, and the highest axial velocity was recorded near y/(R − r) = 0.9. Negative axial velocity was observed near the convex tube along X/(D − d) = 3–23.
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Abbreviations
- D :
-
Diameter of the concave tube (mm)
- d :
-
Diameter of the convex tube (mm)
- L :
-
Axial distance of the swirl chamber (mm)
- R :
-
Radius of the concave tube (mm)
- r :
-
Radius of the convex tube (mm)
- Re :
-
Reynolds number
- U :
-
Time averaged axial velocity (m/s)
- u, v, w:
-
Fluctuating velocity (m/s)
- V :
-
Time averaged radial velocity (m/s)
- X :
-
Axial coordinate of the test tube (mm)
- y :
-
Radial position from the wall (mm)
- S :
-
Swirl intensity \( \left( {S = 1/R\left[ {\int_{0}^{r} {uwr^{2} } /\int_{0}^{r} {u^{2} r{\text{d}}r} } \right]} \right) \)
- θ :
-
Swirl angle \( \left( {\theta = \tan^{ - 1} \frac{vw}{uv}} \right) \)
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Acknowledgments
This work was supported by Ministry of Education, Science and Technology along with Korea Institute of Science and Technology Information as a result of the RESEAT program.
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Chang, TH., Lee, KS. An experimental study on swirling flow in a cylindrical annuli using the PIV technique. J Vis 13, 293–301 (2010). https://doi.org/10.1007/s12650-010-0042-1
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DOI: https://doi.org/10.1007/s12650-010-0042-1