Gas–liquid mass-transfer characteristics during dissolution and evolution in quasi-static and dynamic processes

Ren, Zhipeng; Li, Deyou; Zhou, Weixing; Li, Zhipeng; Wang, Hongjie; Liu, Jintao; Li, Yong; Khoo, Boo Cheong

doi:10.1016/j.ijmultiphaseflow.2024.104970

Cited by 2 publications

References 28 publications

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Research on the hydrodynamic characteristics of pumpjet vector propulsor submersible yaw motion

Xue,

Han,

et al. 2024

Preprint

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The potential value of the new type of vector propulsor in submarine movement has been confirmed. However, some key mechanical issues are not fully understood, especially the hydrodynamic characteristics during oblique motion. By using dynamic mesh simulation methods, a systematic study was conducted on the fluid dynamics behavior of pump jet vector propulsor submarines during oblique and yawing processes, supplemented by the scientific validity of related experimental verification results. The research indicates that oblique movement causes a local stagnation positive pressure zone to form at the bow of the hull and a relative back pressure zone in the middle of the pump shell. As the angle of drift during oblique movement increases, significant improvements are observed in the lateral force, lateral velocity, and lateral moment of the submarine. During yawing motion, a negative pressure zone appears on the right side of the bow, with a local positive pressure zone appearing on the left side. In both oblique and yawing movements, the rotational speed has an amplifying effect on the appearance of the jet wake phenomenon for the submarine. Based on numerical results, a polynomial fitting method is used to establish a mathematical model for the variation of the speed coefficient and angular velocity system of the pump jet vector propulsor submarine with the spiral mixed-flow pump speed. This study provides theoretical guidance for the application and optimization of pump jet vector propulsors.

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Research on the hydrodynamic characteristics of pumpjet vector propulsor submersible yaw motion

Xue,

Han,

et al. 2024

Preprint

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Simulation and Experimental Design of Magnetic Fluid Seal Safety Valve for Pressure Vessel

Li,

Wang,

Shen

et al. 2024

Processes

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This article focuses on the safety valve of pressure vessels, and a new ferrofluid sealing device for pressure vessel safety valves is developed based on a special magnetic circuit. A combined method of numerical calculation and experimental analysis is used to study the relationship between seal clearance, number of seals, pole slot width, pole tooth height, pole tooth width, and the sealing pressure of the ferrofluid sealing device. The research results show that seal clearance and pole tooth width have a significant impact on the sealing performance, and as the dimensions increase, the sealing pressure decreases. As the number of seals, pole tooth height, and slot width increase, the sealing performance initially improves and then decreases. This phenomenon is attributed to the increase in magnetic reluctance in the magnetic circuit. In experimental studies, when the excitation current of the electromagnet is 240 mA and the coil turns number 30, the sealing capacity is 61.22 kPa. When the excitation current is 200 mA and the coil turns number 80, the sealing capacity is 168.24 kPa. The experiments demonstrate the compensating ability of magnetic fluid seals in combination with safety valve seals, confirming that combined seals have higher reliability compared to conventional mechanical seals.

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Gas–liquid mass-transfer characteristics during dissolution and evolution in quasi-static and dynamic processes

Cited by 2 publications

References 28 publications

Research on the hydrodynamic characteristics of pumpjet vector propulsor submersible yaw motion

Research on the hydrodynamic characteristics of pumpjet vector propulsor submersible yaw motion

Simulation and Experimental Design of Magnetic Fluid Seal Safety Valve for Pressure Vessel

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