Applying Laser Doppler Anemometry inside a Taylor-Couette geometry - Using a ray-tracer to correct for curvature effects
arXiv:1203.6748 · doi:10.1016/j.euromechflu.2012.03.013
Abstract
In the present work it will be shown how the curvature of the outer cylinder affects Laser Doppler anemometry measurements inside a Taylor-Couette apparatus. The measurement position and the measured velocity are altered by curved surfaces. Conventional methods for curvature correction are not applicable to our setup, and it will be shown how a ray-tracer can be used to solve this complication. By using a ray-tracer the focal position can be calculated, and the velocity can be corrected. The results of the ray-tracer are verified by measuring an a priori known velocity field, and after applying refractive corrections good agreement with theoretical predictions are found. The methods described in this paper are applied to measure the azimuthal velocity profiles in high Reynolds number Taylor-Couette flow for the case of outer cylinder rotation.
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- Controlling secondary flow in Taylor-Couette turbulence through spanwise-varying roughness
- Azimuthal velocity profiles in Rayleigh-stable Taylor-Couette flow and implied axial angular momentum transport
- Self-similar decay of high Reynolds number Taylor-Couette turbulence
- Reconstructing fluid dynamics with micro-finite element
- Finite-sized rigid spheres in turbulent Taylor-Couette flow