Abstract
Abstract
We report on an application of superstatistics to particle-laden turbulent flow. Four flush-mounted hot-film wall shear sensors were used to record the fluctuations of the wall shear stress in sand-laden flow. By comparing the scaling exponent in sand-free with that in sand-laden flows, we found that the sand-laden flow is more intermittent. By applying the superstatistics analysis to the friction velocity, we found that the large time scale is smaller when the flow is sand-laden. The probability density of a fluctuating energy dissipation rate measured in sand-laden flow follows a log-normal distribution with higher variances than for sand-free flow. The variance of this dissipation rate is a power law of the corresponding time scale. The prediction based on the superstatistics model is consistent with our structure function exponents $$\zeta _n$$
ζ
n
for sand-free flow. Nevertheless, it overestimates $$\zeta _n$$
ζ
n
for sand-laden flow, especially at higher Reynolds numbers.
Graphic abstract
Funder
the State Key Program of National Natural Science Foundation of Chinacience Foundation of China
the National Natural Foundation of China
the Fundamental ResearchFunds for the Central Universities
The Major Science and Technology Project of Gansu Province
Publisher
Springer Science and Business Media LLC
Subject
Surfaces and Interfaces,General Materials Science,General Chemistry,Biophysics,Biotechnology
Cited by
1 articles.
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