The Initial Equations and the Equations for Measuring the Mass and Volume Flow Rates of a Gas

Gerasimov, A. P.; Ivanov, V. P.; Krasavin, V. M.; Lakhov, V. M.; Rainchik, S. V.; Semenova, O. K.

doi:10.1007/s11018-005-0152-7

Cited by 2 publications

(3 citation statements)

References 1 publication

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“…This equation as shown relates the mass flow rate to the flow area A, total pressure P tot and temperature T tot of the flow, the Mach number M, the ratio of specific heats of the gas γ (value of 1.4 in the study), and the gas constant R s [25]. Appropriate initial variables are also defined by the equations above in the simulations in our work.…”

Section: Theory Of the Transonic Compressible Flow Field Simulationmentioning

confidence: 99%

Supersonic antigravity aerodynamic atomization dusting nozzle based on the Laval nozzle and probe jet

Zhang

Wang

et al. 2020

J Braz. Soc. Mech. Sci. Eng.

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To improve the trapping efficiency of respiratory dust by aerodynamic atomization and to maintain the health and safety of workers, a numerical simulation (droplet fragmentation and particle tracking in a high Mach number flow) and an aerodynamic atomization experiment were adopted on the basis of the existing supersonic aerodynamic atomization nozzles that utilize the Laval nozzle as the core. A new type of this kind of nozzle based on a probe structure was designed and optimized. Both the simulation and experimental results have shown that the probe injection method is more suitable for the progress of supersonic aerodynamic atomization. The new nozzle inherits the characteristics of fast droplet speed, conservation of water and pressure, long-range and slow attenuation. The atomization performance of the new nozzle is better than that of traditional nozzles at the same power, and the new nozzle has a larger atomization angle, smaller atomization granularity, lower noise and a more stable atomization output. For the first time, the process of breaking particles by using supersonic gas in the field of dust removal is truly realized. When the pressure is more than 0.1 MPa, antigravity water absorption can be realized. The dust removal rate can be approximately twice as high as that of the traditional ultrasonic atomization method. Compared with the traditional ultrasonic atomization method (84.75%), the dust isolation efficiency can reach 94.07%. The droplets of ultra-fine size with high-speed produced by the new nozzle will have a strong trapping effect on respiratory dust and will save more energy by the vacuum force siphon than currently used nozzles (the amount of gas saved by the same efficiency is 40% and the amount of water saved is 45%).

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Section: Theory Of the Transonic Compressible Flow Field Simulationmentioning

confidence: 99%

Supersonic antigravity aerodynamic atomization dusting nozzle based on the Laval nozzle and probe jet

Zhang

Wang

et al. 2020

J Braz. Soc. Mech. Sci. Eng.

View full text Add to dashboard Cite

show abstract

“…However, because the air flow acceleration principle of the Laval nozzle has the characteristic of maintaining a high pressure (.0.5 MPa) at the entrance and, at the same time, has high requirements for the water injection pressure (.0.12 MPa), the airflow consumption exceeds 100 L/min, and this high energy consumption has become its deficiency in practical applications, although it has excellent atomization performance. [20][21][22] How to save energy, that is, to reduce the pressure flow requirements of air and water and to maintain or further improve the atomization efficiency, has become a difficult problem in the industry.…”

Section: Introductionmentioning

confidence: 99%

“…It uses the air accelerated by a Laval nozzle to stimulate the ultrasonic vibration cavity, produces ultrasonic waves, and mixes a large number of high-speed air flows to form a microscale pneumatic fog curtain, thus realizing wet dust isolation and dust removal. 18,20 In recent years, due to the world’s gradual exploitation of energy, nonrenewable resources are facing the danger of being gradually depleted, and for the widespread and long-term application of this approach, energy-saving has become an indicator of performance. However, because the air flow acceleration principle of the Laval nozzle has the characteristic of maintaining a high pressure (>0.5 MPa) at the entrance and, at the same time, has high requirements for the water injection pressure (>0.12 MPa), the airflow consumption exceeds 100 L/min, and this high energy consumption has become its deficiency in practical applications, although it has excellent atomization performance.…”

Section: Introductionmentioning

confidence: 99%

Dust removal characteristics of a supersonic antigravity siphon atomization nozzle

Zhang

Wang

et al. 2020

Advances in Mechanical Engineering

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To improve the trapping efficiency of respiratory dust by aerodynamic atomization, reduce the energy consumption and the requirements for the working conditions of nozzles and maintain the health and safety of workers, a comparative experiment evaluating aerodynamic atomization dust removal characteristics was conducted with a self-developed supersonic siphon atomization nozzle, which utilizes a Laval nozzle as the core, and an existing ultrasonic atomization nozzle. The experimental results showed that the new type of nozzle, from the perspectives of droplet speed, conservation of water and pressure, range, and attenuation view, completely surpasses the traditional pneumatic atomization nozzle. A supersonic antigravity siphon atomizer produces a cloud fog curtain composed of high-speed droplets and high-speed air. The particle size of the droplets is less than 10 µ. At the same flow rate of water, its dust removal rate is twice as high as that of ultrasonic nozzles. When the dust removal efficiency is the same, the water consumption of the supersonic siphon atomizer nozzle is 1/2, the air flow rate is 1/3, and the power consumption is 1/2 that of the ultrasonic atomizing nozzles. Siphon atomization can siphon at a total air pressure of 0.2 MPa, and the siphon pressure can reach 0.03 MPa at a total air pressure of 0.4 MPa, which increases with the increase in total inlet air pressure. For the first time, the process of siphoning and nozzle internal atomizing in the field of supersonic atomization dust removal is truly realized. The ultrafine sized droplets with high speeds produced by the new nozzle allow them to cover the limited working space in a shorter time, have a more effective trapping effect for a large number of fine dust particles, and quickly suppress the dust with greater kinetic energy. Therefore, the requirements for the working conditions are reduced, which will save more energy compared to the currently used nozzles available on the market.

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The Initial Equations and the Equations for Measuring the Mass and Volume Flow Rates of a Gas

Cited by 2 publications

References 1 publication

Supersonic antigravity aerodynamic atomization dusting nozzle based on the Laval nozzle and probe jet

Supersonic antigravity aerodynamic atomization dusting nozzle based on the Laval nozzle and probe jet

Dust removal characteristics of a supersonic antigravity siphon atomization nozzle

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