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Experimental investigation of flows generated by fractal orifices
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Fractal orifices have been shown to decrease pressure drops across the plate by about 10\% when compared to classical circular orifice~\cite{Nicolleau-et-al-JOT-2011}.
They also provide formidable test-cases for numerical validations
\cite{Melick-Geurts-2012}.
In this contribution, We study the mixing properties of
flow generated after fractal plates in a circular wind tunnel.
In particular, we examine the effects of using non-axi-symmetric orifices on the flows and investigate the effect of the Reynolds number.
We consider two sets of plates: one orifice-like and one perforated-like. The mean velocity profiles are presented at different distances from the plate and we study the convergence of a flow rate based on these profiles.
The return to axi-symmetry depends on how far was the original plate from an axi-symmetric design.
It also depends on the level of iteration of the fractal pattern. In line with results for other flow properties \cite{Nicolleau-et-al-JOT-2011},
it seems that there is not much to be gained by manufacturing fractal plates with more than three iteration levels.
Author(s):
Franck Nicolleau
Sheffield Fluid Mechanics Group, Mechanical Engineering, The University of Sheffield, Sheffield, United Kingdom
United Kingdom
Navin Sangtani Lakhwani
Sheffield Fluid Mechanics Group, The University of Sheffield, Sheffield, United Kingdom
United Kingdom
Wernher Brevis
Sheffield Fluid Mechanics Group, Civil & Structural Engineering, The University of Sheffield, Sheffield, United Kingdom
United Kingdom
Andrzej Nowakowski
Sheffield Fluid Mechanics Group, Mechanical Engineering, The University of Sheffield, Sheffield, United Kingdom
United Kingdom