Formation and Development of Submerged Air Jets

Syeda, Sultana Razia; Ansery, Ashfaq Mohammad

doi:10.3329/jme.v44i2.21721

Cited by 13 publications

(4 citation statements)

References 8 publications

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“…Viscous forces are in opposition to inertial forces during gas injection in liquids, and therefore liquid viscosity has a significant impact on the bubble size [30]. In accordance to [1] formation of gas jets are impeded in liquids with large viscosity. Therefore in liquids with extremely high viscosity the BJT may even disappear.…”

Section: Resultsmentioning

confidence: 99%

“…Commonly, particularly under the current injection conditions at industry, the formed jet is unstable and after certain distance from the nozzle, the jet is disintegrated into discrete large bubbles [1]. The length of the jet depends, among other factors, on the nozzle diameter, the liquid depth, the gas flow rate or the injection velocity, and the physical properties of the gas and the molten metal.…”

Section: Introductionmentioning

confidence: 99%

“…An interesting experimental work on submerged air jets was carried out by [1]. Air jets were injected through nozzles at the bottom of a stagnant liquid pool.…”

Section: Introductionmentioning

confidence: 99%

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Bubbling to Jetting Transition during Argon Injection in Molten Steel

Barrón¹,

Reyes²,

Medina³

2020

WJET

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Bubbling to Jetting Transition is of the outmost importance in metallurgical processes given that the flow regime influences the refining rates, the refractory erosion, and the blockage of injection nozzles. Bubbling to jetting transition during subsonic bottom injection of argon in molten steel is studied here. The effect of the molten steel height, the injection velocity, the nozzle diameter, and the molten steel viscosity on the jet height and the bubbling to jetting transition is numerically analyzed using Computational Fluid Dynamics. Five subsonic argon injection velocities are considered: 5, 25, 50, 100 and 150 m/s. Three values of the metal height are taken into account, namely 1.5 m, 2 m and 2.5 m. Besides, three values of the nozzle diameters are considered: 0.001 m, 0.005 m and 0.01 m. Finally, three values of the molten steel viscosity are supposed: 0.0067, 0.1 and 1 kg/(m•s). It is observed that for the argon-molten steel system, the bubbling to jetting transition occurs for an injection velocity less than 25 m/s and that for the range of viscosities considered, the molten steel viscosity does not exert significant influence on the jet height and the bubbling to jetting transition. Due to the jet instability at subsonic velocities, a second transition, namely jetting to bubbling, is appreciated.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Bubbling to Jetting Transition during Argon Injection in Molten Steel

Barrón¹,

Reyes²,

Medina³

2020

WJET

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“…Harby et al pointed out that the nozzle diameter and Froude number play an important role in determining the pinch-o and jet instability, and Froude number also in uences the angle and halfwidth of the jet [14,15]. Syeda and Ansery's study proved that the jet length is linear with Mach number and the viscosity of uid in uences the development of jet compared with three kinds of liquid [16]. Qin et al revealed that the pressure ratio has a great in uence on the diameter of the jet [17].…”

Section: Introductionmentioning

confidence: 99%

Main Characteristics of Underwater Supersonic Gas Jet Flows

Nan

Chen

Wang

2022

Mathematical Problems in Engineering

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Underwater supersonic gas jet flows are sophisticated physical phenomena that widely exist in underwater propulsion, such as underwater rocket, high-speed torpedo, and water-piercing missile launcher (WPML). The present study aims to explore the characteristics of underwater supersonic jets. This research carries out two-dimensional and three-dimensional underwater jet experiments and establishes an improved spherical bubble model to study the transient and steady-state characteristics of the underwater supersonic jet. The simulation results show that the entrainment strength and anti-interference ability are the main factors affecting the transient characteristics of underwater supersonic jets. The experimental results show that the jet angle increases with increasing pressure and the increased rate of the jet angle decreases with increasing pressure. The jet pulsation exists in the entire experimental pressure range from 0.4 MPa to 6.5 MPa. The frequency of back-attack increases first and then decreases with increasing pressure in the chamber. The frequency peak appears at 0.8 MPa, which is 5.96 Hz.

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