Experimental evidence of convective and absolute instabilities in rotating Hagen–Poiseuille flow

K. Shrestha, L. Parras, C. Del Pino, E. Sanmiguel-Rojas, R. Fernandez-Feria
  • Journal of Fluid Mechanics, January 2013, Cambridge University Press
  • DOI: 10.1017/jfm.2012.600

What is it about?

Have absolute and convective instabilities been shown before in a rotating pipe flow? The answer is negative. For this reason, we conduct experiments to provide flow visualizations. Additionally, we characterize wavelengths and frequencies thar are in excellent agreement with one theoretical work.

Why is it important?

Our findings show that convectively and absolutely unstable flow in rotating pipes can be observed. Thus, we give one strategy to detect the onset of absolute instabilities: the deformation of the flow pattern at the pipe inlet because not only the flow downstream, but the whole spatial domain is affected.


Carlos del Pino

This is the first time that convective and absolute instabilities are observed experimentally in a flow with positive flow rate. Thus, the convective instabilities move only downstream, though converesly, absolute instabilites move also upstream.

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The following have contributed to this page: Carlos del Pino