The Experts below are selected from a list of 309 Experts worldwide ranked by ideXlab platform

Jin-yuan Qian - One of the best experts on this subject based on the ideXlab platform.

  • Pilot Pipe and Damping Orifice Arrangements Analysis of a Pilot-Control Globe Valve
    Journal of Fluids Engineering-transactions of The Asme, 2020
    Co-Authors: Jin-yuan Qian, Jia-yi Wu
    Abstract:

    Abstract Compared to conventional Globe Valves, the pilot-control Globe Valve (PCGV) possesses advantages of lower energy consumption and higher space utilization. In order to analyze the effects of pilot pipe and damping orifice arrangements, this work proposes four PCGVs and conducts simulations to compare their overall performances, overall flow characteristics, and local flow characteristics around the Valve core. In general, the arrangement of the pilot pipe has larger effects on the hydroperformances of PCGVs than the arrangement of the damping orifice. The pipe-parallel-mounted type PCGV performs better in hydroperformance than the pipe-perpendicular-mounted type PCGV, and thus is recommended in practice. As the specified Valve core travel increases, the flow resistance of PCGVs decreases and the flow capacity of PCGVs increases. However, overlarge specified Valve core travel has little effects on the flow resistance and flow capacity of PCGVs. Besides, the increased specified Valve core travel could effectively reduce the wear induced by the uneven pressure distribution on the external lateral face of Valve core, but it has little effect on the wear induced by the uneven pressure distribution on the bottom face. For all pipe-perpendicular-mounted type PCGVs, the variation of axial force imposed on the Valve core relative to the specific Valve core travel presents similar tendencies under different incoming flow velocity within the scope of the investigation, which could be concluded into a fitting equation. This work could be referred for the optimization of PCGVs and other similar Valves.

  • computational fluid dynamics analysis on orifice structure inside Valve core of pilot control angle Globe Valve
    Proceedings of the Institution of Mechanical Engineers Part C: Journal of Mechanical Engineering Science, 2018
    Co-Authors: Ming Zhang, Jin-yuan Qian
    Abstract:

    A novel pilot-control angle Globe Valve is proposed, and it has an obvious advantage of energy conservation during its opening and closing process. In pilot-control angle Globe Valve, the opening a...

  • Parametric study on fluid dynamics of pilot-control angle Globe Valve
    Journal of Fluids Engineering-transactions of The Asme, 2018
    Co-Authors: Jin-yuan Qian
    Abstract:

    Globe Valve is widely used in numerous industries, and its driving energy consumption accounts for high percentages of the whole piping system. In order to figure out novel Globe Valves with low energy consumption, the pilot control Globe Valve (PCGV) is proposed, which is made up of a main Valve and a pilot Valve. By the pressure difference of fluid itself, the opened/closed status of the main Valve can be controlled by the pilot Valve, which can save driving energy and shorten the response time. In order to fit PCGV in an angle displaced piping system, the pilot control angle Globe Valve (PCAGV) is developed. In this paper, with validated numerical methods, both steady and transient simulations focusing on the Valve core diameter, the single/multi orifices, orifice diameters and their arrangements located on the Valve core bottom are presented. The results show that the pressure difference increases with the increase of the Valve core diameter and the decrease of the orifice diameter, and large orifice diameters (d > 12 mm) should be avoided in case the Valve cannot be opened. As for the multi orifices, it can be treated as a single orifice which having similar cross-sectional area. Meanwhile, the opening time of the main Valve also increases with the increase of the Valve core diameter correspondingly. Besides, a fitting formula of pressure difference calculation depending on the inlet velocity and the Valve core diameter is obtained, which is a power–law relationship.

  • A parametric study of hydrodynamic cavitation inside Globe Valves
    Journal of Fluids Engineering-transactions of The Asme, 2017
    Co-Authors: Zhi-jiang Jin, Zhi Xin Gao, Zan Wu, Jin-yuan Qian, Bengt Sundén
    Abstract:

    Hydrodynamic cavitation that occurs inside Valves not only increases the energy consumption burden of the whole piping system but also leads to severe damages to the Valve body and the piping system with a large economic loss. In this paper, in order to reduce the hydrodynamic cavitation inside Globe Valves, effects of Valve body geometrical parameters including bending radius, deviation distance, and arc curvature linked to in/ export parts on hydrodynamic cavitation are investigated by using a cavitation model. To begin with, the numerical model is compared with similar works to check its accuracy. Then, the cavitation index and the total vapor volume are predicted. The results show that vapor primarily appears around the Valve seat and connecting downstream pipes. The hydrodynamic cavitation does not occur under a small inlet velocity, a large bending radius, and a large deviation distance. Cavitation intensity decreases with the increase of the bending radius, the deviation distance, and the arc curvature linked to in/export parts. This indicates that Valve geometrical parameters should be chosen as large as possible, while the maximal fluid velocity should be limited. This work is of significance for hydrodynamic cavitation or Globe Valve design. (Less)

  • obstacle contained system ocs design method and its application in Valve core orifice design of pilot control Globe Valve
    Chinese Journal of Engineering Design, 2017
    Co-Authors: Jin-yuan Qian
    Abstract:

    With the development of the society and the times, traditional parametric design methods are witnessing a severe challenge due to the more and more complex physical systems. Thus, developing novel parametric analysis methods is very important for dealing with complex physical systems, refining useful parameters from numerous data, and proposing accurate prediction formulas. A spring slider system, a direct-current circuit system, a pipeline pressure drop system and a steady heat transfer model of flat plate system were described from the point of systemic parametric analysis method. Then, the key physical parameters in above four systems were summarized. Based on the comparative results, a novel systemic parametric design method, obstacle contained system (OCS) design method, was proposed. The OCS was made up of three elements:an obstacle element, a pass body element and a D-value element. With an abundant accurate data pole, the OCS design method could build the direct relationship of the obstacle element and the D-value element, which meant the simplification of the physical models and much easier to get relatively accurate results. Meanwhile, the design of pilot-control Globe Valve orifice was checked with both the OCS design method and the numerical simulation. The diameter of orifice on the Valve core could influence the pressure difference and the maximum vapor rate inside pilot-control Globe Valves. Achieved by two different methods, the OCS design method and the numerical simulation, the results showed that the effects of orifice diameters on the pressure difference and the maximum vapor rate under different inlet velocities, were within 2% errors, which was reasonable and acceptable for the engineering application. In other words, the OCS design method was credible for parametric analysis. In future, the OCS design method has a broad application prospect to analyze various types of physical models especially in the era of big data.

Jian Kai Wang - One of the best experts on this subject based on the ideXlab platform.

  • experimental and numerical analysis of spring stiffness on flow and Valve core movement in pilot control Globe Valve
    International Journal of Hydrogen Energy, 2017
    Co-Authors: Jin-yuan Qian, Jian Kai Wang
    Abstract:

    Valves are widely used for fluid flow control, not only for conventional fluid like water, gas and oil, but also for hydrogen under high pressure and so forth. Under these new conditions, the response time and energy consumption of Valves are closely related to the whole performance of the piping system. Pilot-control Globe Valve (PCGV) is a novel quick response Valve, which can utilize the pressure difference before and after the Valve core to control the open/close states of the main Valve. In this paper, the effects of spring stiffness inside PCGV on the flow and the Valve core movement are carried out, respectively. To begin with, the experimental setup is introduces and the 3D numerical model is established. The simulation is carried out in software FLUENT with RNG k-e turbulence model, User Defined Function method and dynamic mesh regeneration methods under transmit state. Then, a comparison of steady Valve core displacements between experiment and simulation is carried out. After that, the effects of spring stiffness on flow characteristics, Valve core movement and response times during opening and closing periods are presented. Finally, a spring chosen correction equation is proposed. This work can benefit the further design work of PCGVs or similar Valves with springs, and it can be also referred by someone dealing with novel control Valves design or flow control issues.

  • effects of orifice on pressure difference in pilot control Globe Valve by experimental and numerical methods
    International Journal of Hydrogen Energy, 2016
    Co-Authors: Jin-yuan Qian, Han Zhang, An Le Lu, Jian Kai Wang
    Abstract:

    Abstract Pilot-Control Globe Valve (PCGV) can utilize pressure difference caused by fluid flow through the orifice on Valve core as its power, for open and close the main Valve with a small pilot Valve. It has obvious advantages of energy conservation and quick response. Orifice structure on the Valve core is the main component to determine the pressure difference, which is used to push the Valve core. In this paper, the numerical model with User Defined Functions (UDFs) method is carried out, and the experimental device is arranged. The numerical and experimental results of Valve core displacements achieve agreements. Then, analysis of pressure difference under different static pressures, inlet velocities and different orifice diameters are carried out. It shows that pressure difference has no relationship with static pressure, thus PCGV can be adopted in hydrogen pipelines. Meanwhile, higher inlet velocity can turn out larger pressure difference with quicker response of PCGV. In addition, there exits an unbalanced moment, and 15 mm is the extreme diameter of the orifice for DN150 PCGV. Finally, the design method of the orifice structure in PCGV is proposed with design formulas. This work can help the precise design work of PCGV, and it can be referred by other researchers who are also deal with orifice structures in similar Valves design work.

  • dynamic response analysis of pilot control Globe Valve focusing on opening and closing time of pilot Valve
    Journal of Physics: Conference Series; 745(3) no 032046 (2016), 2016
    Co-Authors: Jian Kai Wang, Jin-yuan Qian, Fu-qiang Chen
    Abstract:

    Pilot control Globe Valve (PCGV) can use the pressure difference produced by fluid itself to realize the opening and closing states with a pilot Valve. In this paper, numerical method is used to investigate the fluid flow characteristics and the Valve core movement inside PCGV under different opening and closing times of pilot Valve. The result shows that, shorter opening and closing time of Valve core results in the shorter vibration of Valve core as well as the stronger unstable fluid in main Valve and faster opening and closing process of PCGV. Longer opening and closing time of Valve core can do less damage to Valve body. This work can give some guides for the optimal design work of PCGV and someone who are researching on Valves with similar structures.

  • numerical analysis of flow and cavitation characteristics in a pilot control Globe Valve with different Valve core displacements
    Journal of Zhejiang University Science, 2016
    Co-Authors: Jin-yuan Qian, Jian Kai Wang, Han Zhang, An Le Lu
    Abstract:

    The pilot-control Globe Valve (PCGV) is a novel Globe Valve with a piston-type Valve core and a small pilot Valve. It can utilize a pressure difference to control the state of the main Valve by the pilot Valve. In this paper, a mathematical model of PCGV is established and a computational fluid dynamics (CFD) method is used to numerically simulate its flow and cavitation characteristics. Analysis of the pressure difference between the upside and downside of the Valve core and comparison with similar previous work increase the reliability of the simulation. Then an analysis of flow and cavitation characteristics is carried out with three comparisons: a comparison between opened and closed states, a comparison between different inlet velocities, and a comparison between different Valve core displacements. The results demonstrate that the vapor volume fraction reaches its peak point at the Valve seat near the outlet tube, and that a higher inlet velocity or smaller Valve core displacement can cause greater cavitation damage. This study can help further design work for optimization and engineering applications of PCGV.

  • cfd analysis on the dynamic flow characteristics of the pilot control Globe Valve
    Energy Conversion and Management, 2014
    Co-Authors: Jin-yuan Qian, Jian Kai Wang, Han Zhang, An Le Lu
    Abstract:

    Abstract The pilot-control Globe Valve (PCGV) is a new kind Valve with simple structures and low driving energy consumption. It can utilize the pressure difference before and after the Valve to control the action of the Valve core. However, systematic theoretical research and numerical analysis are deficient at present. In this paper, the mathematical model of PCGV is established and Computational Fluid Dynamics (CFD) method is employed to numerically simulate its dynamic characteristics. Through the analysis of the internal flow field distribution, its working principle is verified. Then three different opening processes with the same spring stiffness are analyzed under different static inlet pressures, and the best design point is obtained by studying the characteristic curves of the Valve core’s displacement. The relationship of static inlet pressure and the Valve core’s displacement is summarized and the selection formula for the Valve design is generalized which can reduce the various design work for further optimization and engineering applications of PCGV.

Ahmadreza Rashedi - One of the best experts on this subject based on the ideXlab platform.

  • characterization of droplet sizes in large scale oil water flow downstream from a Globe Valve
    International Journal of Multiphase Flow, 2018
    Co-Authors: L D Paolinelli, Ahmadreza Rashedi
    Abstract:

    Abstract Oil–water dispersed flows produced at Valves or restrictions are very common in industry. For example, crude oil desalting processes normally use dispersion Valves to mix the dilution water. In this case, the knowledge of dispersed droplet sizes is crucial for the design and optimum control of the process. However, little work has been devoted to characterize and model droplet sizes produced in industrial-type Valves. The present work studies water droplet sizes produced by the passage of oil–water flow through a Globe Valve mounted in a large scale flow loop of 0.1 m internal diameter. Experiments were performed under different pressure drops across the Globe Valve, and different oil and water flow rates. Produced water droplet sizes were measured in situ downstream from the Globe Valve location using particle video microscopy. Droplet sizes were compared with theoretical scales for turbulent and viscous break-up. The effect of the volume fraction of dispersed phase on droplet size was also examined. In addition, droplet size distributions were analyzed and fitted using known statistical functions.

  • Characterization of droplet sizes in large scale oil–water flow downstream from a Globe Valve
    International Journal of Multiphase Flow, 2018
    Co-Authors: L D Paolinelli, Ahmadreza Rashedi
    Abstract:

    Abstract Oil–water dispersed flows produced at Valves or restrictions are very common in industry. For example, crude oil desalting processes normally use dispersion Valves to mix the dilution water. In this case, the knowledge of dispersed droplet sizes is crucial for the design and optimum control of the process. However, little work has been devoted to characterize and model droplet sizes produced in industrial-type Valves. The present work studies water droplet sizes produced by the passage of oil–water flow through a Globe Valve mounted in a large scale flow loop of 0.1 m internal diameter. Experiments were performed under different pressure drops across the Globe Valve, and different oil and water flow rates. Produced water droplet sizes were measured in situ downstream from the Globe Valve location using particle video microscopy. Droplet sizes were compared with theoretical scales for turbulent and viscous break-up. The effect of the volume fraction of dispersed phase on droplet size was also examined. In addition, droplet size distributions were analyzed and fitted using known statistical functions.

An Le Lu - One of the best experts on this subject based on the ideXlab platform.

  • effects of orifice on pressure difference in pilot control Globe Valve by experimental and numerical methods
    International Journal of Hydrogen Energy, 2016
    Co-Authors: Jin-yuan Qian, Han Zhang, An Le Lu, Jian Kai Wang
    Abstract:

    Abstract Pilot-Control Globe Valve (PCGV) can utilize pressure difference caused by fluid flow through the orifice on Valve core as its power, for open and close the main Valve with a small pilot Valve. It has obvious advantages of energy conservation and quick response. Orifice structure on the Valve core is the main component to determine the pressure difference, which is used to push the Valve core. In this paper, the numerical model with User Defined Functions (UDFs) method is carried out, and the experimental device is arranged. The numerical and experimental results of Valve core displacements achieve agreements. Then, analysis of pressure difference under different static pressures, inlet velocities and different orifice diameters are carried out. It shows that pressure difference has no relationship with static pressure, thus PCGV can be adopted in hydrogen pipelines. Meanwhile, higher inlet velocity can turn out larger pressure difference with quicker response of PCGV. In addition, there exits an unbalanced moment, and 15 mm is the extreme diameter of the orifice for DN150 PCGV. Finally, the design method of the orifice structure in PCGV is proposed with design formulas. This work can help the precise design work of PCGV, and it can be referred by other researchers who are also deal with orifice structures in similar Valves design work.

  • transient simulation of Valve core movement of pilot control Globe Valve in vertical pipelines
    Paiguan Jixie Gongcheng Xuebao Journal of Drainage and Irrigation Machinery Engineering; 34(1) pp 51-65 (2016), 2016
    Co-Authors: Jin-yuan Qian, An Le Lu
    Abstract:

    A novel pilot-control Globe Valve, which can be used in vertical pipelines with a lower driving energy consumption, is proposed. A governing equation for Valve core motion is obtained through a theoretical analysis of the forces applied on the Valve core. A 3D simulation of Valve core motion is conducted in Fluent by using User Defined Function (UDF) to involve different spring stiffness, steady state displacements, impact speeds and transient state displacements. The results show that there are different opening modes for different spring stiffness. For smaller spring stiffness, the Valve is subject to a quicker response to flow to ensure it can work properly; however, this can more easily result in a higher impact speed. With the increasing of spring stiffness, the steady displacement of the core reduces especially beyond a turning point. Besides, the numerical transient displacements with 0.9 and 1.1 times the spring stiffness show good agreement with those obtained from a theoretical analysis. It is found out that the real spring design point should have 0.9 times the spring stiffness determined by the theoretical analysis. This paper provides a reference for designing and application of pilot-control Globe Valves or other Valves with similar structures. (Less)

  • numerical analysis of flow and cavitation characteristics in a pilot control Globe Valve with different Valve core displacements
    Journal of Zhejiang University Science, 2016
    Co-Authors: Jin-yuan Qian, Jian Kai Wang, Han Zhang, An Le Lu
    Abstract:

    The pilot-control Globe Valve (PCGV) is a novel Globe Valve with a piston-type Valve core and a small pilot Valve. It can utilize a pressure difference to control the state of the main Valve by the pilot Valve. In this paper, a mathematical model of PCGV is established and a computational fluid dynamics (CFD) method is used to numerically simulate its flow and cavitation characteristics. Analysis of the pressure difference between the upside and downside of the Valve core and comparison with similar previous work increase the reliability of the simulation. Then an analysis of flow and cavitation characteristics is carried out with three comparisons: a comparison between opened and closed states, a comparison between different inlet velocities, and a comparison between different Valve core displacements. The results demonstrate that the vapor volume fraction reaches its peak point at the Valve seat near the outlet tube, and that a higher inlet velocity or smaller Valve core displacement can cause greater cavitation damage. This study can help further design work for optimization and engineering applications of PCGV.

  • cfd analysis on the dynamic flow characteristics of the pilot control Globe Valve
    Energy Conversion and Management, 2014
    Co-Authors: Jin-yuan Qian, Jian Kai Wang, Han Zhang, An Le Lu
    Abstract:

    Abstract The pilot-control Globe Valve (PCGV) is a new kind Valve with simple structures and low driving energy consumption. It can utilize the pressure difference before and after the Valve to control the action of the Valve core. However, systematic theoretical research and numerical analysis are deficient at present. In this paper, the mathematical model of PCGV is established and Computational Fluid Dynamics (CFD) method is employed to numerically simulate its dynamic characteristics. Through the analysis of the internal flow field distribution, its working principle is verified. Then three different opening processes with the same spring stiffness are analyzed under different static inlet pressures, and the best design point is obtained by studying the characteristic curves of the Valve core’s displacement. The relationship of static inlet pressure and the Valve core’s displacement is summarized and the selection formula for the Valve design is generalized which can reduce the various design work for further optimization and engineering applications of PCGV.

L D Paolinelli - One of the best experts on this subject based on the ideXlab platform.

  • characterization of droplet sizes in large scale oil water flow downstream from a Globe Valve
    International Journal of Multiphase Flow, 2018
    Co-Authors: L D Paolinelli, Ahmadreza Rashedi
    Abstract:

    Abstract Oil–water dispersed flows produced at Valves or restrictions are very common in industry. For example, crude oil desalting processes normally use dispersion Valves to mix the dilution water. In this case, the knowledge of dispersed droplet sizes is crucial for the design and optimum control of the process. However, little work has been devoted to characterize and model droplet sizes produced in industrial-type Valves. The present work studies water droplet sizes produced by the passage of oil–water flow through a Globe Valve mounted in a large scale flow loop of 0.1 m internal diameter. Experiments were performed under different pressure drops across the Globe Valve, and different oil and water flow rates. Produced water droplet sizes were measured in situ downstream from the Globe Valve location using particle video microscopy. Droplet sizes were compared with theoretical scales for turbulent and viscous break-up. The effect of the volume fraction of dispersed phase on droplet size was also examined. In addition, droplet size distributions were analyzed and fitted using known statistical functions.

  • Characterization of droplet sizes in large scale oil–water flow downstream from a Globe Valve
    International Journal of Multiphase Flow, 2018
    Co-Authors: L D Paolinelli, Ahmadreza Rashedi
    Abstract:

    Abstract Oil–water dispersed flows produced at Valves or restrictions are very common in industry. For example, crude oil desalting processes normally use dispersion Valves to mix the dilution water. In this case, the knowledge of dispersed droplet sizes is crucial for the design and optimum control of the process. However, little work has been devoted to characterize and model droplet sizes produced in industrial-type Valves. The present work studies water droplet sizes produced by the passage of oil–water flow through a Globe Valve mounted in a large scale flow loop of 0.1 m internal diameter. Experiments were performed under different pressure drops across the Globe Valve, and different oil and water flow rates. Produced water droplet sizes were measured in situ downstream from the Globe Valve location using particle video microscopy. Droplet sizes were compared with theoretical scales for turbulent and viscous break-up. The effect of the volume fraction of dispersed phase on droplet size was also examined. In addition, droplet size distributions were analyzed and fitted using known statistical functions.