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Evaluation of oscillations frequency of gas-liquid interaction by image processing

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Last Updated on Thursday, 04 June 2015 13:20

Published on Sunday, 29 March 2015 12:46

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Authors:

V.I. Yeliseyev, Cand. Sci. (Phys.-Math.), Senior Research Scientist, Dnepropetrovsk National University of O. Gonchar, Senior Research Scientist of Research Laboratory of Fluid Mechanics and Heat-Mass Exchange Processes Modeling, Dnepropetrovsk, Ukraine

A.P. Tolstopyat, Cand. Sci. (Tech.), Senior Research Fellow, O. Gonchar Dnepropetrovsk National University, Senior Research Scientist of Research Laboratory of Fluid Mechanics and Heat-Mass Exchange Processes Modeling, Dnipropetrovsk, Ukraine

L.A. Fleyer, O. Gonchar Dnepropetrovsk National University, Senior Research Scientist of Research Laboratory of Fluid Mechanics and Heat-Mass Exchange Processes Modeling, Dnipropetrovsk, Ukraine

Т.А. Ruzova, Cand. Sci. (Tech.), O. Gonchar Dnepropetrovsk National University, Senior Research Scientist of Research Laboratory of Fluid Mechanics and Heat-Mass Exchange Processes Modeling, Dnipropetrovsk, Ukraine

Abstract:

Gas-liquid interaction is one of the key features in a number of technological processes.

Purpose. To evaluate amplitude-frequency characteristics (AFC) of the gas-liquid interaction (at submersible blow of technological tank). AFC of wave formation on the liquid surface in the tank and of at-nozzle zone characterizing AFC of tuyère unit.

Methodology. We investigate the gas-liquid interaction using a transparent model of technological apparatus. Model liquid is water; model gas is air (consumption – 0.4 ÷2.0 m³/h). Blowing device with angle of nozzle tip deviation from tuyère axisα= 0°; 45°; 90°is immersed into liquid. The process is recorded by camcorder (VPC-HD 1000 with shutter ~1/10000s, 60fps) in transmitted light. The resulting video material is processed by computer. AFC, gas content and phase surface analogs and dispersion magnification factors are evaluated.

Findings. Based on statistical analysis of process images, we obtain the dependence of bubbles dispersing efficiency in the tank on blowing mode and tuyère design. We propose definition and evaluation of effective frequency f**, found by the highest AFC dynamic component of at-nozzle zone: u=A ·f.

We have found non-monotony of dispersion degree dependence on blowing mode changes in the investigated range 10²<Ar<10⁴.

Originality. An experimental study on determination the effectiveness of different designs of submersible blowing devices by video images of gas-liquid interaction in technological unit.

Practical value. Research results are applied in developing schemes and blowing modes for out-of-furnace metal working in hot-metal ladle cars.

References:

1. Naydek,V.L., Tarasevich, N.I., Gonchar, B.S., Belousov, V.V. and Komarov, V.F. (2009), “Modeling of hydro-gas-dynamic processes in a cavity of a tundish ladle of the continuous steel casting machine”, Dopovidi Natsionalnoi akademii nauk Ukrainy, no 5, pp. 73−77.

 Моделирование гидрогазодинамических процес­сов в полости промежуточного ковша машины непрерывной разливки стали / Найдек В.Л., Тарасевич Н.И, Гончар Б.С. [и др.]// Доповiдi Нацiональної академiї наук України. – 2009. – № 5. – С. 73−77.

2. Xu, X., Brooks, G.A., and Yang, W. (2010), “Online analysis of stirring processes in ladle metallurgy”, Metallurgical and Materials Transactions. Part B, Vol. 41, no. 5, pp. 1025–1032.

3. Goldschmit, M.B. and Owen, A.H.C. (2001), “Numerical modelling of gas stirred ladles”, Ironmaking & Steelmaking, Vol. 28, no. 4, pp. 337−341.

4. Ruzova, T.A., Tolstopyat, A.P., Shevchenko, A.F. and Shevchenko, S.A. (2007), “Computer processing of interaction between gas jets and liquid”, Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu, Dnipropetrovsk, no. 12, pp. 91−96.

 Компьютерная обработка кинограмм процесса взаимодействия газовых струй с жидкостью / Рузова Т.А., Толстопят А.П., Шевченко А.Ф., Шевченко С.А. // Науковий вісник Національного гірничого університету. – 2007. – № 12. – С. 91–96.

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