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An investigation of swirling flow in a cylindrical tube

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Abstract

An experimental study was performed for measuring velocity and turbulence intensity in a circular tube for Re=10,000, 15,000 and 20,000, with swirl and without swirling flow. The velocity fields were measured using PIV techniques and swirl motion was produced by a tangential inlet condition. Some preliminary measurements indicated that over the first 4 diameter, two regions of flow reversal were set up (the so called 2-cell structure). At the highest Reynolds numbers, the maximum values of the measured axial velocity components had moved toward the test tube wall and produce more flow reversal at the corner of the tube. As the Reynolds number increased, the turbulence intensity of swirling flow at the tube inlet also increased.

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Abbreviations

C fg :

Cross-correlation coefficients

D :

Diameter of the test tube

f i :

Gray levels of the pixels within the

g i :

Gray levels of the pixels within the correlation region

L :

Axial distance between the exit of the swirl chamber and the inlet of test tube

n :

The pixel number of the correlation area

r :

Radial position

R :

Radius of the test tube

u :

Fluctuating velocity

U :

Time averaged axial velocity

\(\bar U\) :

Mean average axial velocity

X :

Axial coordinate

y :

Distance from the wall

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Authors and Affiliations

  1. Division of Mechanical and Automation Engineering, Kyungnam University, 449 Wolyoung Dong Masan, Kyungnam, Korea

    Tae-Hyun Chang & Hee-Young Kim (Graduate Student)

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  1. Tae-Hyun Chang
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  2. Hee-Young Kim
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Correspondence to Tae-Hyun Chang.

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Chang, TH., Kim, HY. An investigation of swirling flow in a cylindrical tube. KSME International Journal 15, 1892–1899 (2001). https://doi.org/10.1007/BF03185149

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  • DOI: https://doi.org/10.1007/BF03185149

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