Науковий вісник НГУ

Method of experimental evaluation velocity of particles in two-phase flow

User Rating:  / 1

Details

Category: IT technologies

Last Updated on Sunday, 14 July 2013 15:37

Published on Wednesday, 14 November 2012 11:56

Hits: 6335

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

А.П. Tolstopyat, Candidate of Technical Sciences, 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:

When dealing with hydro- and pneumatic transport systems the main point is to evaluate velocities of particles in channels.

Purpose. To evaluate solid dispersed phase velocity as one of the basic parameters of two-phase medium flow, to realize connection between registering opto-electronic sensor and computer (by means of audio input) and to design the software for signal treating and evaluating of the values of physical parameters.

Methodology. The signal from sensor is digitized to wav-format audio file and has a form of impulse sequence, each of them corresponds to the moment of passing the particle by the photo sensor window. Because of the fact that the system is supplied with two photo sensors and the distance between them is known, the particle velocity can be evaluated due to the estimation of the time spent by the particle on passing this distance, which can be evaluated as interval between impulse pair corresponding to the signals of first and second sensors. But, as a rule, the signal is not structured, because the particles are not thrown uniformly. That is why the algorithm for evaluating particles velocities which does not depend on the uniformity was proposed.

Originality. The method for evaluation of dispersed phase velocity was developed. The equipment circuit and software for treating the signal from optoelectronic sensor to evaluate velocities of disperse particles in tuyer channel were designed. The experimental investigation of particles velocity evaluation in straight pipes at different channel slope angles by program treatment of the signal received from optoelectronic sensor.

Findings. Developed equipment circuit and signal processing methods allow carrying out investigation in stream splitter operating efficiency at different constructional features, high velocities without bringing disturbing elements in gas-carrier stream.

Practical value. Results of investigation are implemented at designing of pneumatic transport system construction for powder magnesium supply to hot-metal ladle cars.

References:

1. Nigmatulin, R.I. (1995), “Drift flux model as approximation of two fluid model for two phase dispersed and slug flow in tube”, Proc. of the 7-th Nuclear Thermo-Hydraulics Conf. (NURETH-7), New York, vol. 1, pp. 215–225.

2. Волошин А. И. Механика пневмотранспортирования сыпучих материалов / Волошин А.И., Понома-рев Б.В. – К.: Наук. думка, 2001. – 248 с.

Voloshin, A.I. and Ponomarev, B.V. (2001), Mekhanika pnevmotransportirovania sypuchikh materialov [Bulk Solids Pneumotransporting Mechanics], Naukova dumka, Kiev, Ukraine.

3. Рузова Т.А. Оперативный контроль параметров частиц дисперсных образований // Рузова Т.А., Карпов О.Н., Флеер Л.А. // Науковий вісник Національного гірничого університету.– Дніпропетровськ, 2004. – №2. – С. 83–88.

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, no. 83–88.

4. Толстопят А.П. Определение скорости движущихся частиц с помощью видеокамеры / Толстопят А.П., Елисеев В.И. // Оптические методы исследования потоков: труды XI международной научно-технической конференции. – М., 2011. – С. 101–103.

Tolstopyat, A.P., Yeliseyev, V.I. (2011), “Moving particles velocity evaluation by camcorder”, Optical methods of flow investigation, Proc. of the 11th International Scientific and Technical Conference, Moscow, Russia, pp. 101–103.

5. Гнеденко Б.В. Курс теории вероятностей / Гнеденко Б.В. – М.: Эдиториал УРСС, 2001. – 320 с.

Gnedenko, B.V. (2001), Kurs teorii veroyatnostey [Course of Probability Theory], Editorial URSS, Moscow, Russia.

6. Рудзит Я.А. Основы метрологии, точность и надежность в приборостроении / Рудзит Я.А., Плуталов В.Н. – М.: Машиностроение, 1991. – 304 с.

Rudzit, Ya.A. and Plutalov, V.N. (1991), Osnovy meteorologii, tochnost i nadezhnost v priborostroyenii [Fundamentals of Metreology, Accuracy and Reliability at Instrument Making Industry], Mashinostroeniye, Moscow, Russia.

ruzova
2013-07-14  652.82 KB  1573

• < Prev
• Next >