The intensity of flow swirl is a crucial parameter that
affects heat and mass transfer processes. However, the widely used Chigier and
Beer integral parameter is not universal and has certain limitations,
particularly in cases of strong swirl and the appearance of return flows or
weak axial flows such as those found in vortex chambers.
The present study proposes a criterion for estimating the
intensity of flow swirl using the Mach number for the rotational component of
velocity at specific points. Flow self-similarity along both channel radius and
length has been investigated for a wide variety of conditions. The study also
analyses the sharp decrease in the maximum value of the criterion during the
propagation of submerged jets in a tube and in the case of mixing in a confined
swirl flow. The proposed approximating dependencies describing the decrease in
swirl intensity were obtained based on experimental works of different authors.
The experimental data were generalised using the asymptotic
approach of the Kutateladze–Leontiev film cooling theory by applying the
analogy of the criterion with the distributions of the dimensionless temperature
along the channel radius and length.
Author(s) Details
N. E. Shishkin
Kutateladze Institute of Thermophysics, Siberian Branch of the Russian
Academy of Sciences, Novosibirk, 630090, Russia.
Please see the link:- https://doi.org/10.9734/bpi/psniad/v3/6520
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