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Imaging the transient boundary layer on a free rotating disc.
Branimir Matijasević1, Zvonimir Guzović, Vinko Martinis
1Faculty of Mechanical Engineering and Naval Architecture, University of Zagreb, Croatia. branimir.matijasevic@fsb.hr
Annals of the New York Academy of Sciences
|December 24, 2002
Summary
This study visually examines the laminar boundary layer (BL) transition to turbulent BL on a rotating disc. Key factors influencing this transition include energy ratios and Reynolds numbers (Re).
Area of Science:
- Fluid Dynamics
- Aerodynamics
- Turbulence
Background:
- Understanding boundary layer (BL) transition is crucial in fluid dynamics.
- The behavior of boundary layers on rotating surfaces presents unique challenges.
Purpose of the Study:
- To visually investigate the transition process from laminar to turbulent boundary layers on a free rotating disc.
- To analyze the BL structure in relation to key flow parameters.
Main Methods:
- Experimental investigation using advanced imaging techniques.
- Analysis of the ratio between turbulent and vortex energy.
- Examination of critical and transient Reynolds numbers (Re).
Main Results:
- Detailed visualization of the laminar-to-turbulent boundary layer transition.
- Quantification of vortex numbers and their dependency on Reynolds number (Re).
- Correlation of BL structure with energy ratios and distance from the disc.
Conclusions:
- The study provides insights into the complex dynamics of boundary layer transition on rotating discs.
- Identified critical parameters influencing the transition process.
- Experimental data offers a basis for validating computational fluid dynamics (CFD) models.