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Thermophysics and Aeromechanics

2021 year, number 4

Experimental study of stratified flow hydrodynamics for concurrent mixing streams

S.M. Dmitriev, A.E. Khrobostov, M.A. Legchanov, S.S. Borodin, A.A. Barinov, I.A. Konovalov, A.A. Chesnokov, M.A. Makarov
Nizhny Novgorod State Technical University n.a. R.E. Alekseev, Nizhny Novgorod, Russia
Keywords: concurrent flow, stratification, spatial conductometry


This paper presents the results of experimental study for turbulent flow performed using a conductometry measurement system. Processing of experimental data produces the estimates for average tracer concentration in the cells of the conductometry sensor, the dispersion for parameter representation, as well as autocorrelation functions and the histograms of probability distribution functions for the measured signal. The experimental data was compared with the results of GEMIX benchmark, which has a similar problem statement and tailored for a study of isothermal and nonisothermal mixing processes (the outcome parameters are found using the PIV method). This comparison demonstrates matching for typical wavelengths concerning the ordered flow structures developing at the streams interface. We also observe compliance for turbulent kinetic energy profiles within the central region of experimental model. Meanwhile, the outer zones have a significant discrepancy with the GEMIX-calculated data. This can be explained by a difference in measurement methods and a higher spatial resolution of the PIV method exceeding that for the conductometry method.