What is it about?
This research explains some experimental findings on accelerated turbulent pipe flow. The analytical explanation is based on the Theory of Underlying Laminar Flow (TULF) that the authors have created. The experimental findings reveal that accelerated mean-velocity profiles become flattered, when compared with equal-Reynolds-number steady-state mean-velocity profiles. Moreover, if the acceleration is intense enough and limited to a short time interval, the mean velocity increases well after the acceleration ramp is finished, and then decreases up to its final value. This strange behaviour is analytically explained in the paper.
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Why is it important?
To the authors' knowledge, the TULF is the sole theoretical framework that can explain the observed experimental behaviour. Researchers interested on unsteady turbulent flows are recommended to become acquainted with the TULF.
Perspectives
The TULF is successfully applied to explain other interesting phenomena observed experimentally on unsteady pipe flow, like strangely deformed mean-velocity profiles.
F. Javier Garcia Garcia
Universidade da Coruna
Read the Original
This page is a summary of: On an analytical explanation of the phenomena observed in accelerated turbulent pipe flow, Journal of Fluid Mechanics, October 2019, Cambridge University Press,
DOI: 10.1017/jfm.2019.733.
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