Research on ball valve and misaligned guide vane devices to improve the “S” characteristics of a pump turbine

Yang, Biao; Zhang, Lin; Tian, Tian; Qin, Yankui; Liu, Changyu

doi:10.1007/s12206-022-0425-y

Cited by 2 publications

(2 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In recent years, due to the excellent fluidity, electrical conductivity, thermal conductivity, biocompatibility, antimicrobial properties, and self‐healing properties, gallium‐based LMs have attracted much attention to be applied in thermal management systems, catalysis, flexible electronics, biomedical engineering, biomimetic robots, and many other fields. [ 7–9 ]…”

Section: Introductionmentioning

confidence: 99%

“…[6] In this review, we focus on gallium-based LM composites (GLMs) and their fabrication method.In recent years, due to the excellent fluidity, electrical conductivity, thermal conductivity, biocompatibility, antimicrobial properties, and self-healing properties, gallium-based LMs have attracted much attention to be applied in thermal management systems, catalysis, flexible electronics, biomedical engineering, biomimetic robots, and many other fields. [7][8][9] Pure gallium, as a LM, has good electrical conductivity (about 2-7 Â 10 6 S m À1 , one order of magnitude lower than common conductors such as Cu and Ag). [10,11] But it's usually a Newtonian fluid with a very high surface tension (about 600 mN m À1 , 10 times that of water).…”

mentioning

confidence: 99%

See 1 more Smart Citation

Gallium‐Based Liquid Metal Composites and the Continuous Forming Methods

Wang,

Wu,

Wang

et al. 2024

Adv Eng Mater

View full text Add to dashboard Cite

Owing to the dual nature of metal and fluid, gallium‐based liquid metals with a low melting point at or around room temperature have gained growing interest recently. Although more and more properties of gallium were developed, their intrinsic properties were not able to meet the increasing requirement from scientific and industrial community. To broaden its applications, many kinds of gallium‐based liquid metal composites were prepared and applied in the cutting‐edge fields like biomedical engineering, flexible robots, heat management and so on. To summarize the latest progress and promote development, this review summaries the recent progress of liquid metal composites and the continuous forming methods recently, including the physical and chemical properties of gallium‐based liquid metal, composites prepared through physical doping and surface modification and the continuous forming approaches. Further outlook including expectations and challenges of gallium‐based liquid metal composites are also presented.This article is protected by copyright. All rights reserved.

show abstract

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

Gallium‐Based Liquid Metal Composites and the Continuous Forming Methods

Wang,

Wu,

Wang

et al. 2024

Adv Eng Mater

View full text Add to dashboard Cite

show abstract

Numerical Simulation Study on Hydraulic Characteristics and Wear of Eccentric Semi-Ball Valve under Sediment Laden Water Flow

Cheng,

Tang,

et al. 2024

Sustainability

View full text Add to dashboard Cite

To investigate the variation laws of various hydraulic parameters and internal fluid flow patterns of eccentric semi-ball valves under different boundary conditions, the DPM model was used to numerically simulate the eccentric semi-ball valve based on Fluent 2021 R1 software. The flow velocity, pressure distribution, and erosion wear rate on the valve wall were simulated under different combinations of opening, inlet flow velocity, and sediment concentration conditions, and hydraulic parameters such as drag coefficient, flow coefficient, and cavitation coefficient were calculated. The results show that as the opening of the eccentric semi-ball valve increases, the valve drag coefficient decreases, the flow coefficient increases, the cavitation coefficient increases, and the degree of cavitation decreases. The flow velocity in the high-velocity zone at both ends of the valve plate decreases, and the gradient of water flow velocity passing through the valve decreases. The area of the low-velocity zone at the rear of the valve plate decreases, and the vortex phenomenon gradually weakens; as the sediment content in the water increases, the valve drag coefficient increases, the flow coefficient decreases, and the cavitation coefficient first increases and then decreases. The maximum flow velocity of the pipeline decreases faster and faster, causing an increase in pressure gradient in the flow area and drastic changes. This results in higher pressure on the pipe wall near the valve plate, especially a significant increase in negative pressure; As the inlet flow rate increases, the valve drag coefficient decreases, the flow coefficient increases, and the cavitation coefficient gradually decreases. The flow velocity of the water passing through the valve increases, and the low-pressure area downstream of the valve plate increases. The pressure gradient at both ends of the valve port increases significantly from small to large, and the positive pressure upstream of the valve plate gradually increases. The force of the water flow on the valve plate is large, causing friction between the valve stem and the valve body, which is not conducive to long-term operation. With the increase in inlet flow rate, the maximum wear amount and wear range of the valve plate have significantly increased, and erosion wear is mainly distributed in point blocks at the edge of the valve plate. This study can provide certain references and solutions for the key technology research of eccentric semi-ball valves and assess the performance indicators of the operation being maintained.

show abstract

Research on ball valve and misaligned guide vane devices to improve the “S” characteristics of a pump turbine

Cited by 2 publications

References 18 publications

Gallium‐Based Liquid Metal Composites and the Continuous Forming Methods

Gallium‐Based Liquid Metal Composites and the Continuous Forming Methods

Numerical Simulation Study on Hydraulic Characteristics and Wear of Eccentric Semi-Ball Valve under Sediment Laden Water Flow

Contact Info

Product

Resources

About