Influence of elbow curvature on flow and turbulence structure through a 90° elbow

Ikarashi, Yuya; Uno, Tomoyasu; Yamagata, Takayuki; Fujisawa, Nobuyuki

doi:10.1016/j.nucengdes.2018.09.011

Cited by 24 publications

(4 citation statements)

References 33 publications

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“…Some new measurement methods such as PIV and numerical simulation technology are also applied in recent research. In the aspect of experimental research, Ikarashia and Taguchi analyzed the influence of curvature on the flow field [12][13][14][15]. Visualization method is introduced into Fujisawa's study about the mass transfer characteristics in the elbow [16].…”

Section: Research Methods and Status Of Metrological Characteristics Of Elbow Flowmetermentioning

confidence: 99%

Analysis of metrological characteristics of elbow flowmeter under rotating state

Wang

Luo

et al. 2021

Int. J. Metrol. Qual. Eng.

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The application of elbow flowmeter in rotary equipments is beneficial to reduce the pipeline complexity. However, the intervention of centrifugal acceleration will lead to the change of metrological characteristics of elbow flowmeter. Based on the analysis of the differential pressure formation mechanism of the environmental acceleration on the elbow flowmeter, the calculation formula of the flow rate measurement with the elbow flowmeter in the rotating state is derived, and the fitting method of the discharge coefficient is put forward. The CFD method was used to analyze the internal flow field of the elbow flowmeter under rotating state, summarize the pressure distribution characteristics of the pipe wall, and verify the feasibility of the discharge coefficient fitting strategy by simulation. The results show that for the elbow flowmeters with diameters of 10 mm and 15 mm and the radius to diameter ratio of 1.5, as long as the water flow rate is between 1.5 m/s and 5 m/s, the measurement accuracy can be guaranteed to be above 4%.

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Section: Research Methods and Status Of Metrological Characteristics Of Elbow Flowmetermentioning

confidence: 99%

Analysis of metrological characteristics of elbow flowmeter under rotating state

Wang

Luo

et al. 2021

Int. J. Metrol. Qual. Eng.

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“…Turbulence is easy to form at the elbow, and the local flow rate increases significantly, leading to an increase in the local corrosion rate [5][6][7][8]. In order to study the influence of flow rate and bending angle on elbow corrosion, fluent software was used to simulate the flow field of socket welding and butt welding [9][10][11][12].…”

Section: Flow Field Simulation Of Elbowmentioning

confidence: 99%

Leakage Analysis of Steam Condensate Pipe Elbow

2023

J. Phys.: Conf. Ser.

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The cause of leakage of a steam condensate pipe elbow has been carried out by means of chemical composition analysis, fracture surface analysis and numerical simulation. The results show that the inner wall of the pipe at the socket welding of the downstream pipe elbow of the steam trap is not enough smooth, and the inner diameter suddenly changes, resulting in a sudden increase in the flow velocity, which increases the erosion-corrosion rate of the pipe wall, and finally leads to the elbow leakage.

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“…The research by Kim et al [31] further revealed a strong correlation between the swirl intensity of secondary flow and the curvature radius of a 90 • bend while showing a weak correlation with the Reynolds number. Recently, some researchers [32][33][34][35] employed the PIV measurement technique to study the flow field and turbulence structure in curved pipes. Among them, Ikarashi et al [32] investigated the influence of bend curvature (1.0, 1.2, 1.5) on the flow field of a 90 • bend, specifically analyzing the phenomena of flow separation and secondary flow.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, some researchers [32][33][34][35] employed the PIV measurement technique to study the flow field and turbulence structure in curved pipes. Among them, Ikarashi et al [32] investigated the influence of bend curvature (1.0, 1.2, 1.5) on the flow field of a 90 • bend, specifically analyzing the phenomena of flow separation and secondary flow. It was observed that flow separation occurred on the inner wall near the bend exit, particularly at smaller radius ratios, increasing the velocity of the secondary flow and turbulent kinetic energy.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Flow Instability and Mechanical Energy Loss of Fluid Field in Fluid Momentum Wheel

Zhang,

Wang,

Liu

et al. 2024

JMSE

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A new type of anti-rolling device denoted as a fluid momentum wheel (FMW) is proposed to address the limitations of traditional gyrostabilizers in reducing the roll responses of floating platforms in waves. The proposed device is based on the same gyroscope theorem, which differs from a rigid gyrostabilizer in that the internal fluid generates secondary flow in the cross-section under the combined effects of inertial centrifugal force and a radial pressure gradient, and the streamwise velocity exhibits a non-uniform distribution. These instability phenomena may cause mechanical energy loss in the flow field, which is critical for selecting the driving device and the anti-roll control performance of offshore platforms. In the study, different turbulence models are compared with the results of a Direct Numerical Simulation (DNS) and experiments to ensure the accuracy of the numerical method, and the spatiotemporal distribution characteristics of the flow field in FMW are analyzed. Therein, the SST k-ω model accurately verifies the flow instability phenomenon of the FMW observed in the Particle Image Velocimetry (PIV) experiment. Next, this paper proposes corresponding evaluation parameters to assess the impact of typical parameters on the flow field instability. The results show that the flow instability increases with an increase in the typical parameters of FMWs (such as the pipe diameter, curvature radius, and velocity). Furthermore, the paper discusses the relationship between dimensionless mechanical factors (Reynolds number, curvature ratio) and the spatiotemporal instability of the flow field, revealing the essential effects of the curvature ratio and Reynolds number on the loss coefficient.

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Influence of elbow curvature on flow and turbulence structure through a 90° elbow

Cited by 24 publications

References 33 publications

Analysis of metrological characteristics of elbow flowmeter under rotating state

Analysis of metrological characteristics of elbow flowmeter under rotating state

Leakage Analysis of Steam Condensate Pipe Elbow

Analysis of Flow Instability and Mechanical Energy Loss of Fluid Field in Fluid Momentum Wheel

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