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Experimental and mechanistic study of dispersed micrometer-sized particle resuspension in a square straight duct with rough walls

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Particuology 2023年第12期83卷 101-114页

作者： Qi Sun Suyuan Yu Wei Peng Institute of Nuclear and New Energy Technology Cooperation Innovation Center of Advanced Nuclear Energy TechnologyKey Laboratory of Advanced Reactor Engineering and Safety of Ministry of EducationTsinghua UniversityBeijing100084China Center for Combustion Energy Key Laboratory for Thermal Science and Power Engineering of the Ministry of EducationDepartment of Energy and Power EngineeringTsinghua UniversityBeijing100084China

The resuspension of graphite dust is an important phenomenon in the release of radioactivity and the safety of nuclear reactors during severe *** this study,a visualization experimental platform is constructed to study effects of particle size,flow velocity,and wall roughness on the resuspension characteristics of graphite particles.A statistical model of particle resuspension applicable to monolayer dispersed particles is developed based on the moment equilibrium of the particles and the flow field characteristics,as calculated by the large-eddy simulation *** results show that particle resuspension can be divided into short-and long-term resuspension *** particle resuspension occurs during the short-term *** increases in flow velocity and particle diameter,the aerodynamic or adhesion force acting on the particles increases,and corresponding particle resuspension fraction *** influence of rough walls on particle resuspension is related to both the force on the particles and the arm ratio between the wall morphology and the particle diameter.A comparison with the experimental results demonstrates that the particle resuspension model developed in this study accurately predicts the impact of flow velocity,particle size,and wall roughness on particle resuspension.

关键词： particle resuspension Statistical model Moment equilibrium High temperature gas-cooled reactor(HTGR)

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Investigation on the influence of vortex generator on particle resuspension

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Particuology 2024年第3期86卷 126-136页

作者： Dongchi Yu Jun-Li Lin Jin-Han Xie ASML 80W Tasman DrSan Jose95134CaliforniaUSA Department of Mechanics and Engineering Science at College of Engineering and State Key Laboratory for Turbulence and Complex Systems Peking UniversityBeijing100081China

The vortex generator(VG)and its well-known effect in flow optimization are widely studied and employed across different engineering ***,while the same working principles of VG may be well suited for the applications on surface-cleaning technologies,such promising potential is hardly,if any,explored in the published ***,in the present study,the influence on flow-induced particle resuspension brought by a rectangular vG in a channel flow is investigated with the help of highfidelity computational fluid dynamics *** increases of particle removal forces and resuspension rates are discovered in long,strip-like regions with reduced boundary-layer thickness resulted from the vG-induced vortices,and the enhancement effect is especially significant for configurations with the VG installed at a greater angle of *** is also shown that while the resuspension enhancements on the lower and the upper surfaces of the channel exhibit distinct statistical characteristics,having a VG in the channel improves the overall particle-removing capability of the channel flow by introducing higher surface-averaged removal forces and particle resuspension *** but not least,the increase of resuspension rate is especially significant for the smaller,micron-scale particles which are otherwise hardly disturbed by a VG-less channel flow,and such resuspension-enhancement effectgenerally subsides with increasing particle size.

关键词： particle resuspension Vortexgenerator CFD Surface cleaning

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Solid particle resuspension Model Development for the GASFLOW Code

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Journal of Energy and Power Engineering 2011年第10期5卷 911-917页

作者： Z. Xu J.R. Travis T. Jordan Karlsruhe Institute of Technology Karlsruhe D76021 Germany Ingenieurburo DuBois-Pitzer-Travis Offenbach D63071 Germany

Tons of solid particles, like carbon, beryllium and tungsten with diameters of several to several hundreds microns, would be generated as dusts in vacuum vessel during operation of ITER, In accident scenarios, e.g., loss of vacuum accident, the potentially combustible dust particles can be suspended by the air ingress and entrained into the whole vessel, and impose a risk of dust explosions to the whole facility. Therefore, the mechanism of particle resuspension was investigated theoretically. A force balance approach and numerical fittings have been utilized to develop a semi-empirical particle resuspension model based on a group of particle resuspension experimental data. The model has been applied into a three-dimensional computational fluid dynamics code, GASFLOW. The model validation has been done by comparison of the numerical predictions about particle resuspension rates in given incoming flows against the corresponding experimental data. The comparisons have proved the validity of the developed model.

关键词： particle resuspension numerical model combustible dust ITER GASFLOW.

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resuspension of spherical particles due to surface vibration

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Particuology 2021年第1期19卷 126-135页

作者： Sofia Eirini Chatoutsidou Mihalis Lazaridis School of Environmental Engineering Technical University of Crete73100 ChaniaGreece

In this study,particle resuspension due to surface vibration was investigated.A spherical particle was assumed to rest on top of a thin plate,and an external vibrating force was applied normal on the plate at t=0 and at distance R from the *** external driving force created a displacement field in both time and space domains,where deformations in the body of the plate were considered small elastic oscillations that are perpendicular to the propagation of the *** oscillations were introduced via the theory of elasticity and the creation of waves on thin plates,i.e.,bending *** motion in the vertical direction was initiated through plate displacement,provided that inertia due to particle mass is *** particular,the particle was assumed to oscillate with a force(of oscillation)estimated via Newton’s second law of motion,comprising of two components:the acceleration due to the plate displacement and the particle ***,a simple force balance method was used to determine the conditions for ***,resuspension occurs when the oscillation force exceeds the couple of the adhesive and gravitational *** results suggest that the plate displacement depends on the characteristics of the applied force,material properties,and plate *** addition,it was found that the oscillation force is substantially lower than the applied force and that it depends on plate displacement and particle ***,the particle size significantly influencedthe outcome of ***,resuspension is favorable for large particles,strong applied forces,and high forcing frequencies.

关键词： particle resuspension Vibration Bending waves

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