3D CFD simulation of a circulating fluidized bed with on-line adjustment of mechanical valve

Liu, Cenfan; Zhao, Mingzhao; Wang, Wei; Li, Jinghai

doi:10.1016/j.ces.2015.07.006

Cited by 16 publications

(3 citation statements)

References 36 publications

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“…Until now, most of the previous literature on internal flow characteristics considering the movement of the valve was geometrically simple, and the direction of the valve was also simple due to the difficulties mentioned above [14,15]. Recently, a numerical model based on the moving grid technology was carried out to study the effect of spool rotating speed on the internal flow characteristics of the cryogenic ball valve with one inlet and outlet [16].…”

Section: Introductionmentioning

confidence: 99%

Transient and Dynamic Simulation of the Fluid Flow through Five-Way Electric Coolant Control Valve of a 100 kW Fuel Cell Vehicle by CFD with Moving Grid Technique

Jeong,

Kang,

Moon

et al. 2024

Actuators

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In order to maintain the performance of a fuel cell vehicle, it is essential to maintain a constant temperature of the stack. Therefore, it is very important to distribute the optimal coolant flow rate to each major component under very diverse and rapidly changing dynamic operating conditions. The part responsible for this is a five-way electric coolant valve. Therefore, this study aims to investigate transient dynamic flow characteristics of the fluid flow through a five-way electric coolant valve (PCCV: Penta-Control Coolant Valve). To achieve this goal, this paper attempts a three-dimensional dynamic simulation of the fluid flow through the valve using a commercial CFD solver with moving mesh technique to consider flow inertia and dynamic flow in the opening and closing stages of the ball valve rotating motion. The dynamic flow characteristics and the thermal mixing inside the PCCV ball valve during the opening and closing stages are analyzed. It was found that the discrepancies between dynamic and steady-state simulations are remarkable when fluxes with different levels of enthalpy and momentum flow into the PCCV, leading to strong flow interference and flow inertia, while the discrepancies are relatively small at low rotation speed and weak flow interference. Subsequently, the effect of the dynamic flow characteristics of the valve on the dynamic thermal mixing characteristics at two different ball valve rotation speeds and rotation directions are investigated. It was found that the dynamic flow and thermal mixing characteristics inside the PCCV are greatly affected by the rotation speed, rotation direction, and degree of flow interference between fluxes. It also helps design better coolant control strategies and improves the FCEV thermal management system.

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Section: Introductionmentioning

confidence: 99%

Transient and Dynamic Simulation of the Fluid Flow through Five-Way Electric Coolant Control Valve of a 100 kW Fuel Cell Vehicle by CFD with Moving Grid Technique

Jeong,

Kang,

Moon

et al. 2024

Actuators

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“…Therefore, they decided to extrude 2D geometry for arbitrary thickness to obtain as if it is 3D volume. Another transient CFD simulation for a mechanical valve and flow behaviour according to valve position studied by Cenfan Liu et al (2015). They used a sliding mesh method to mimic the closing of the mechanical valve in 3D CFD model.…”

Section: Introductionmentioning

confidence: 99%

Fluid-Structure Interaction Simulation of Excess Flow Valve Movement at Different Operating Pressures and Gas Flow Rates

2021

JAFM

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Excess Flow Valves (EFV) for gas-stop systems is generally used in natural gas pipelines to prevent possible damages or destruction due to gas leakage. It can be used in a wide operating range of pressure, but the shutoff flow rate could be in various values at different pressures since natural gas can easily be compressed and can reach higher density. In this study, shut-off and nominal gas flow which effect on a spring force attached to an EFV system simulation by using Fluid Solid Interaction (FSI) strategy was studied. Furthermore, User Define Function (UDF) adapted to simulation to obtain the time-dependent deformation of the spring. The simulations were repeated at five different operating pressures (1-5 bar) with changing flow rates to show if EFV can shut-off the system or not. Results were validated against experimental data of the EFV to show the consistency of the FSI strategy. Moreover, detailed behaviour information of the EFV obtained by means.

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“…Most of the simulations focused on the riser by isolating the riser from the system and setting inlet solids circulating rates G s 1) as a constant. Recently, full‐loop simulation emerged as a promising research method for the CFB system , which simulates the CFB as a whole dynamic system. In full‐loop simulation, G s is calculated and usually fluctuates over time .…”

Section: Introductionmentioning

confidence: 99%

Full‐Loop Simulation of Gas‐Solids Flow in a Pilot‐Scale Circulating Fluidized Bed

Wang

Shi

et al. 2019

Chem Eng & Technol

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In order to study the system hydrodynamics in a circulating fluidized bed (CFB), a 3D full‐loop simulation was conducted for a pilot‐scale CFB. The Eulerian‐Eulerian two‐fluid model with the kinetic theory of granular theory helped to simulate the gas‐solids flow in the CFB. The system hydrodynamics including pressure balance, vectors of gas and solids, distribution of solids holdup, and instantaneous circulating rates were obtained to get a comprehensive understanding of the system. It was predicted that the main driving force was the pressure drop of the storage tank. The storage height and valve opening were critical operating factors to control the riser operation. The effects of operating conditions including solids circulating rates and superficial gas velocity on the hydrodynamics were investigated to provide guidance for the stable operation of the CFB system.

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3D CFD simulation of a circulating fluidized bed with on-line adjustment of mechanical valve

Cited by 16 publications

References 36 publications

Transient and Dynamic Simulation of the Fluid Flow through Five-Way Electric Coolant Control Valve of a 100 kW Fuel Cell Vehicle by CFD with Moving Grid Technique

Transient and Dynamic Simulation of the Fluid Flow through Five-Way Electric Coolant Control Valve of a 100 kW Fuel Cell Vehicle by CFD with Moving Grid Technique

Fluid-Structure Interaction Simulation of Excess Flow Valve Movement at Different Operating Pressures and Gas Flow Rates

Full‐Loop Simulation of Gas‐Solids Flow in a Pilot‐Scale Circulating Fluidized Bed

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