Experimental Study on Atomization Characteristics of Gas–Liquid Two-Phase Flow Nozzle and Its Dust Removal Effect

An experimental study on the flow rate and atomization characteristics of a new gas–liquid two-phase flow nozzle was carried out to use high-concentration respirable dust in the workplace of high-efficiency sedimentation coal production based on the gas–liquid two-phase flow nozzle technology. The simulation roadway of dust fall in large coal mines was constructed, and the respirable rock dust produced by fully mechanized mining surfaces was chosen as the research object. The effects of humidity on the capture effect of respirable rock dust were analyzed in the experimental study. The results demonstrated that: (1) the distribution range of the particle size of fogdrops declines with the reduction in fogdrops D50, D[3,2] and D[4,3], which are produced by gas–liquid two-phase flow nozzles. (2) The initial ambient humidity in the simulated roadway was 64.8% RH. After the gas–liquid two-phase flow spray was started, the ambient humidity was elevated by 23.2 to 23.5% RH within 840s and tended to be stable and no longer grew after reaching 88.0–88.3% RH. The initial growth rate of the ambient humidity in the simulated roadway was high, and then was gradually slowed down. (3) Humidity is an important factor influencing the collection of respirable dust. The humidity at 10.0 m leeward of the dust-producing point was increased by 19.6% RH, and the sedimentation rate of respirable dust was increased by 6.73%; the two growth rates were 13.1% RH and 9.90% at 20.0 m; 16.4% RH and 15.42% at 30.0 m; 18.4% RH and 11.20% at 40.0 m. In practical applications of the gas–liquid two-phase flow nozzle in coal mining activities, attention shall be paid to not only the influences of its atomization characteristics on the capture effect of respirable dust but also the influences of the flow rate of the nozzle on the humidity of the working surface. Appropriate gas and water supply pressures shall be chosen according to the space and respirable dust concentration on the working surface to realize a better dust removal effect.

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Experimental study on the two-phase flow pattern and transformation characteristics of a flow mixing nozzle under a moderate flow rate

Meccanica ◽

10.1007/s11012-019-01014-2 ◽

2019 ◽

Vol 54 (8) ◽

pp. 1121-1133 ◽

Cited By ~ 1

Author(s):

Jin Zhao ◽

Zhi Ning ◽

Ming Lv

Keyword(s):

Experimental Study ◽

Flow Pattern ◽

Flow Rate ◽

Two Phase Flow ◽

Phase Flow ◽

Two Phase ◽

Flow Mixing ◽

Moderate Flow Rate

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Experimental study of two-phase flow instability of vertical parallel rifled tube with different sizes at low-mass flow rate

Asia-Pacific Journal of Chemical Engineering ◽

10.1002/apj.619 ◽

2011 ◽

Vol 7 (5) ◽

pp. 687-697 ◽

Cited By ~ 3

Author(s):

Zhian Deng ◽

Yushan Luo ◽

Haijun Wang ◽

Tingkuan Chen

Keyword(s):

Experimental Study ◽

Mass Flow Rate ◽

Mass Flow ◽

Flow Rate ◽

Two Phase Flow ◽

Flow Instability ◽

Phase Flow ◽

Two Phase ◽

Low Mass

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Experimental Study of Two-Phase Flow in an Oscillating Vertical Pipe

Volume 8: Polar and Arctic Sciences and Technology; Petroleum Technology ◽

10.1115/omae2018-78323 ◽

2018 ◽

Author(s):

Elinaldo Santos Silva ◽

Sergio N. Bordalo

Keyword(s):

Experimental Study ◽

Flow Rate ◽

Oil And Gas ◽

Two Phase Flow ◽

Flow Patterns ◽

Head Loss ◽

Phase Flow ◽

Vertical Pipe ◽

Two Phase ◽

Operational Conditions

Two-phase vertical flows are of utmost importance for petroleum production, since underground petroleum reservoirs produce oil and gas simultaneously, which must flow together upward to the sea floor through wells, and from these to the production floating units through suspended pipes (risers). Along the pipelines, the mixture of oil and gas may develop several flow patterns — such as bubble, slug, churn and annular flow. These physical configurations present specific characteristics that demand distinct modeling of the head loss as a function of the flow rate. The correct characterization of the flow patterns, under given operational conditions, is fundamental to the modeling of the dynamics of the flow and to the relation between head loss and flow rate. In the literature, most studies on the establishment of the flow patterns have been carried with water and air, and have been restricted to the case of static pipes, while production risers are in constant movement due to the action of waves, sea currents and the displacement of the floating production unit. In the present work, an experimental study of vertical two-phase flow of water and air is conducted with the oscillatory movement of a long and slender flexible vertical pipe of 8,0 m of length and 25,4 mm of diameter. The head loss is measured for different frequencies of oscillation. Comparisons are made between the static and oscillating pipe, with regard to the flow patterns and head losses. The effect of the frequency of oscillation is detected.

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