Experimental investigation of viscoelastic turbulent fluid hammer in helical tubes, considering column-separation

Rezapour, Sahar; Riasi, Alireza

doi:10.1016/j.ijpvp.2021.104489

Cited by 4 publications

(2 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Physically, this last incident is sparked by the appearance of vacuum pockets dispersed over the piping system, as a result of a local decrease in the fluid's pressure down to its pressure value. Then, [7,8].…”

Section: Introductionmentioning

confidence: 99%

Influence of Pipe Diameter and Material on Water Hammer in Piped Systems

Ahmed,

Shehata,

Abdel-Wahed

2024

Journal of Advanced Engineering Trends

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 99%

Influence of Pipe Diameter and Material on Water Hammer in Piped Systems

Ahmed,

Shehata,

Abdel-Wahed

2024

Journal of Advanced Engineering Trends

View full text Add to dashboard Cite

“…In the physical test of bubble distribution, Tokuhiro [13] and others obtained the required flow field parameters using a CCD camera and workstation processing under laser irradiation and measured the trajectory and morphology change rule of bubbles. SRA et al [14] photographed and processed the stagnant gas phenomenon in the pipeline and established the generation law and movement state of stagnant gas in the pressurized pipeline. Wan et al [15] designed a physical test model with several consecutive bends and concluded through a large number of tests that an appropriate reduction in the inclination angle of the pipeline and an increase in the flow rate can effectively discharge the stagnant gas mass in the pipeline.…”

Section: Introductionmentioning

confidence: 99%

Study on the Transient Flow Characteristics of a Hump Water Pipeline Based on the Random Distribution of Bubbles

Wang,

Hu,

Song

et al. 2023

Water

View full text Add to dashboard Cite

Aiming at establishing the transient flow characteristics of gas–liquid two-phase flow in high-undulation water pipelines, based on the bubble distribution law measured using physical tests, the bubble distribution law function was input into the hump-pipe fluid domain model, and CFD numerical simulation was carried out for different flow rates and different air contents. The CLSVOF two-phase flow model and the RNG k-ε turbulence model were used to analyze the flow pattern evolution and pressure pulsation propagation in the process of gas–liquid two-phase flow through a hump pipe. The results show that the bubble size has a lognormal distribution, the equivalent diameter is between 3 mm and 10 mm, and the evolution of the flow pattern in the hump pipe is complex and violent. In the horizontal pipe section, there are three main flow patterns: bubble flow, wavy flow and segment plug flow. In the vertical pipe, there are two main flow patterns, slug flow and churning flow, and the flow pattern is affected by the flow rate and the air content rate. When air bubbles or air pockets in the pipeline flow through a certain area, this leads to a steep increase and decrease in the pressure pulsation amplitude in the region, and the pressure fluctuation is extremely frequent. Compared with the water flow rate, the air content is the main factor affecting the relative pressure pulsation amplitude under the condition of a 0.15-air content operating mode, which is generally approximately two to six times that of the 0-air content operating mode. The results of the research should facilitate the prediction of stagnant gas pipeline system bursts and water hammer protection, providing a theoretical basis and calculation parameters.

show abstract

Experimental Investigation of the Steady-State Flow Field with Particle Image Velocimetry on a Nozzle Check Valve and Its Dynamic Behaviour on the Pipeline System

Chang

Jiang

2022

Energies

View full text Add to dashboard Cite

In the present work, to investigate the hydraulic losses and safe operation of nozzle check valves in industrial piping systems, the static characteristics of the valve and its dynamic behavior in the pipeline system were studied using an experimental bench with a visual DN300 nozzle check valve. Besides, basing on the PIV (Particle Image Velocimetry) technique measures the valve steady-state flow field under the different flow rates. The study has shown that as the flow rate rises, the valve disc displacement slowly increases to 44 mm, then rapidly increases to a maximum displacement of 72 mm. When the Reynolds number exceeds 5 × 105, the relationship between pressure drop and flow obeys a quadratic function. The local vortex area formed by the flow passage near the downstream deflector expands with the flow improvement. As the increase of flowrate, at low flow operating conditions, the downstream flow velocity in the local high-speed area near the valve body increases; at medium operating conditions, the area’s flow velocity decreases; at high flow work, this local high-speed area disappears. When the fluid deceleration is lower than 4 m/s2, the dynamic behavior satisfies the quadratic curve when the maximum slope is only 0.354, which shows that this nozzle check valve has a favorable response to the system.

show abstract

Experimental investigation of viscoelastic turbulent fluid hammer in helical tubes, considering column-separation

Cited by 4 publications

References 37 publications

Influence of Pipe Diameter and Material on Water Hammer in Piped Systems

Influence of Pipe Diameter and Material on Water Hammer in Piped Systems

Study on the Transient Flow Characteristics of a Hump Water Pipeline Based on the Random Distribution of Bubbles

Experimental Investigation of the Steady-State Flow Field with Particle Image Velocimetry on a Nozzle Check Valve and Its Dynamic Behaviour on the Pipeline System

Contact Info

Product

Resources

About