Numerical performance and safety analyses of a retainer-type ball valve for use in a high-pressure district heating pipeline

Yang, Seung Deok; Kim, Chul-Kyu; Jeon, Seok Yun; Yoon, Jasang

doi:10.1177/0954408916666303

Cited by 3 publications

(2 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Extensive CFD studies of valve flows have been conducted in support of understanding and improving designs. Some examples of such CFD studies can be found in [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. Similar to experimental measurements, there are uncertainties/errors in all of the industrially practical CFD methods.…”

Section: Introductionmentioning

confidence: 99%

An assessment of eddy viscosity models on predicting performance parameters of valves

Duan

Jackson

Eaton

et al. 2019

Nuclear Engineering and Design

View full text Add to dashboard Cite

The major objective of the present study is to evaluate the performance of a range of turbulent eddy viscosity models in the prediction of macro-parameters (flow coefficient (CQ) and force coefficient (CF)), for certain types of valve, including the conic valve, the disk valves, and the compensated valve. This has been achieved by comparison of numerical predictions with experimental measurements available in the literature. The examined turbulence models include most of the available turbulent eddy viscosity models in STAR-CCM+ 12.04. They are the standard k-ε model, realizable k-ε model, k-ω-sst model, V2F model, EB k-ε model and the Lag EB k-ε models. The low-Re turbulence models (k-ω-sst, V2F, EB k-ε and Lag EB k-ε) perform worse than the high-Re models (standard k-ε and realizable k-ε). For the conic valve, the performance of different turbulent models varies little; the standard k-ε model shows a marginal advantage over the others. The performance of the turbulence models changed greatly, however, for prediction of CQ and CF of the disk and compensated valves. In general, the realizable k-ε model is demonstrated to be a robust choice for both valve types. Although the EB k-ε may marginally outperform it in the prediction of CF at large disk valve opening. The effects of the unknown entry flow and initialization conditions are also studied. The predictions are more sensitive to the entry flow condition when the valve opening is large. Additionally, the uncertainties caused by unknown entry conditions are comparable to overall modelling errors in some cases. For flow systems with multiple stable flow-states coexisting in the flow domain, the output of the numerical models can also be affected by the initialization conditions. When the streamline curvature and secondary flow is modest like conical valve flow, the nonlinear modification of the standard k-ε model and k-ω-sst model, as well as the curvature correction in the realizable k-ε model, will not have visible effects on the numerical prediction. Once the strong streamline curvature and secondary flow exit in the domain, such as the disk valve flow, the non-linear modification of the standard k-ε model will greatly improve the numerical outputs, however, the non-linear modifications of k-ω-sst model only have minor effects. Moreover, the curvature correction in the realizable k-ε model will jeopardise the accuracy of outputs in the same case.

show abstract

Section: Introductionmentioning

confidence: 99%

An assessment of eddy viscosity models on predicting performance parameters of valves

Duan

Jackson

Eaton

et al. 2019

Nuclear Engineering and Design

View full text Add to dashboard Cite

show abstract

“…Wu et al 20 conducted a CFD analysis of a wedge-type, double-disc, parallel gate valve and investigated the influence of different working conditions on the gate valve flow rate and loss coefficient. Yang et al 21 used CFD and finite element method (FEM) analyses to study flow characteristics and safety performance of a retainer-type ball valve. Kim et al 22 experimentally investigate the flow characteristics of single, double, and triple eccentric butterfly valves and concentric inclined disc butterfly valves.…”

Section: Introductionmentioning

confidence: 99%

Comparative analysis of transient valve-induced flow characteristics between opening and closing processes

Liu

Tian

Wang

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part E:

View full text Add to dashboard Cite

Transient control of process valves, including opening and closing processes, is consistently encountered in many fluid transportation and control industries. During opening and closing processes, valve-induced transient flow presents different unstable flow characteristics. This transient valve-induced unstable flow that develops along the pipeline can cause violent pressure and velocity fluctuations that considerably influence accurate flow measurement downstream. In this paper, gate valve-induced flow characteristics during opening and closing processes were comparatively studied. An experimental system was developed to monitor the downstream pressure along the pipeline, and corresponding transient numerical simulations were performed on opening and closing processes using a user-defined function and dynamic grid technology. The pressure distributions along the pipeline's downstream area during valve opening and closing processes were investigated to verify the accuracy of the numerical simulation. The mechanism of transient flow difference under the same valve opening during opening and closing processes was determined to be a hysteresis effect. The jet flow intensity under a small valve opening in the opening process was greater than that in the closing process, and the difference in flow field under the 50% valve opening was the largest. Moreover, the velocity and turbulent kinetic energy distributions in different downstream cross-sections during valve opening and closing processes were comparatively analyzed. The change rate of the maximum turbulent kinetic energy was introduced to further analyze the different effects of opening and closing processes on the transient flow stability downstream of the valve. Results showed that the flow stability between 40% and 50% valve opening was the worst irrespective of the adjustment process, that is, a large pipeline distance was required to stabilize this transient flow. This study helps in understanding transient valve-induced flow characteristics in fluid transportation pipelines and provides guidance for accurate flow metering industrial applications.

show abstract

Modal and structural analysis on a main feed water regulating valve under different loading conditions

Yang²,

et al. 2021

Annals of Nuclear Energy

View full text Add to dashboard Cite

Numerical performance and safety analyses of a retainer-type ball valve for use in a high-pressure district heating pipeline

Cited by 3 publications

References 12 publications

An assessment of eddy viscosity models on predicting performance parameters of valves

An assessment of eddy viscosity models on predicting performance parameters of valves

Comparative analysis of transient valve-induced flow characteristics between opening and closing processes

Modal and structural analysis on a main feed water regulating valve under different loading conditions

Contact Info

Product

Resources

About