Distribution of solid particles and gas dispersions during injection of sunken two-phase jet into liquid

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 Authors:

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

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

Abstract:

Purpose. To study hydro-gas-dynamic interaction, determine the most efficient blowing modes, and find the ways to increase the process efficiency.

Methodology. Experimental investigation of liquid-gas interaction in transparent model of technological device has been carried out. Water was used as liquid and air was used as gas in the model (gas consumption is 0,5–3,5 m3/h). The pipe (tuyere) with external diameter of 3 mm has been installed along the vessel axis. Pipe penetration into liquid was 200 mm. Three types of tuyers have been tested. The difference between them consisted in the configuration of the submersible part and nozzle. Two tips were extension of the pipe and differ by internal diameter, and the third one was V-shaped nozzle, made of two pipes. Injected medium was polystyrene (consumption of 30–100 g/min).

Process recording was realized by camcorder (shutter is ~1/2000 с, 25fps) in transmitted light. Video material was processed by computer. On the basis of the results optical heterogeneities, including both gas phase and conglomerates (condensed areas) of solid dispersive phase particles has been selected and digitized. Irregularity ratios for distribution of these parameters in diametric section of the vessel have been evaluated.

Originality. We have investigated experimentally the submersible jet injection into liquid in the ladle by blowing devices of different construction of and blowing modes of gas and dispersive phases. On the base of statistical treatment analysis of videoimages the efficient dispergation modes have been determined.

Findings. We have determined that double change in gas speed at the nozzle output makes no effect on heterogeneities value and their distribution uniformity. Dispergation of the system by V-shaped pipe is 2 times higher, and the distribution irregularity is 3 times less than dispergation by single-nozzle pipe, and this corresponds to more efficient and quiet process.

The dependency in dimensionless complexes for calculating the length of immersed two phase jet has been obtained.

Practical value. The results are used for design the plan of out-of-furnace metal treatment in hot-metal ladle cars.

 

References: 
 
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Ruzova, T.A., Karpov, O.N. and Fleyer, L.A. (2004), “Efficient evaluation of particles parameters in dispersed structures”, Naukovyi visnyk Natsionalnoho hirnychoho universytetu, no.2, pp. 83–88.
 
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