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Experimental and numerical study of a gas cyclone with a central filter

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Particuology 2022年第4期20卷 47-59页

作者： Zihui Zhang Sijie Dong Kejun Dong Li'an Hou Wenzheng Wang Yi Wei Bo Wang Key Laboratory of Western China's Environmental Systems(Ministry of Education)and Engineering Research Center of Fine Particles Pollution Control Technology and Equipment of Gansu Province College of Earth and Environmental SciencesLanzhou UniversityLanzhou 730000China Centre for Infrastructure Engineering School of EngineeringWestern Sydney UniversityPenrithNSW 2751Australia Xi'an High-Tech Institute Xi'an 710025China Gansu Chemical Industry Research Institute Co. Ltd.Lanzhou 730000China

This paper studies a novel gas cyclone with a cylindrical fiter face installed in the center from the vortex finder to the bottom *** experimental results show that this composite cyclone has a higher collection fficiency and a lower pressure drop than the original *** mechanisms for the improvement are analyzed by both physical experiments and numerical *** measuring dust samples collected at different places it is revealed that the center filter can prevent fine particles from entering the inner vortex and escaping,which accounts for the increase of the collection *** addition,the flow field of the composite cyclone is simulated by computational fluid dynamics and compared with that of the original *** analysis shows that with the filter layer installed,the swirling flow disappears in the vortex finder,which decreases the kinetic energy dissipation and hence lowers the pressure drop.

关键词： Cyclone Filtration porous media model Collection efficiency Pressure drop

3-D numerical simulation of curved open channel confluence flow with partially non-submerged rigid vegetation

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Journal of Hydrodynamics 2021年第5期33卷 992-1006页

作者： Zheng-rui Shi Cong-fang Ai Sheng Jin School of Civil and Hydraulic Engineering Dalian University of TechnologyDalian 116024China

For the study of the effects of partially non-submerged rigid vegetation on the free-surface confluence flow in a curved open channel,a numerical simulation is carried out by using the Volume of Fluid model combined with the porous media model with the software *** model is first validated by using available experimental measurement data with a good ***,the characteristics of the separation zone generated by the centrifugal forces and the confluence flow are *** to the resistance created by the vegetation,the velocities in the separation zone are more chaotic and the separation zone becomes smaller and more *** reduction of the separation zone area of the vegetated flow in the convex bank is more significant than that in the concave *** velocities in the vegetated region become much smaller and remains so in the downstream flow after the vegetation ***,the vegetation compresses and divides the circulations in the flow area,rebuilding a structure with smaller circulations in the main flow and unclear circulations in the vegetation *** addition,the bed wall shear stresses are significantly smaller in the vegetation region and the separation zone compared to the non-vegetated *** implies that the vegetation can have the effect of protecting the river bed from erosion.

关键词： Curved open channel confluence flow porous media model non-submerged rigid vegetation separation zone

Experimental and Numerical Investigations of the Hydrodynamic Characteristics, Twine Deformation, and Flow Field Around the Netting Structure Composed of Two Types of Twine Materials for Midwater Trawls

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Journal of Ocean University of China 2021年第5期20卷 1215-1235页

作者： THIERRY Bruno Nyatchouba Nsangue TANG Hao ACHILE Njomoue Pandong XU Liuxiong ZHOU Cheng HU Fuxiang College of Marine Sciences Shanghai Ocean UniversityShanghai 201306China National Engineering Research Center for Oceanic Fisheries Shanghai 201306China Key Laboratory of Oceanic Fisheries Exploration Ministry of Agriculture and Rural AffairsShanghai 201306China The Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources Ministry of EducationShanghai Ocean UniversityShanghai 201306China Scientific Observing and Experimental Station of Oceanic Fishery Resources Ministry of Agriculture and Rural AffairsShanghai 201306China Laboratory E3M National High Polytechnic School of DoualaUniversity of DoualaDouala 2701Cameroon Faculty of Marine Science Tokyo University of Marine Science and TechnologyMinatoTokyo 108-8477Japan

Nettings are complex flexible structures used in various *** the hydrodynamic characteristics,de-formation,and the flow field around nettings is important to design successful fishing *** study investigated the hydrodynamic characteristics and deformation of five nettings made of polyethylene and nylon materials in different attack angles through numeri-cal simulation and physical model *** numerical model was based on the one-way coupling between computational fluid dynamics(CFD)and large deflection nonlinear structural ***-Stokes equations were solved using the finite volume ap-proach,the flow was described using the k-ωshear stress turbulent model,and the large deflection structural dynamic equation was derived using a finite element approach to understand the netting deformation and nodal *** porous media model was chosen to model the nettings in the CFD *** data were compared with the experimental results of the physical model to validate the numerical *** showed that the numerical data were compatible with the experimental data with an average relative error of 2.34%,3.40%,6.50%,and 5.80%in the normal drag coefficients,parallel drag coefficients,inclined drag coefficients,and inclined lift coefficients,*** hydrodynamic forces of the polyethylene and nylon nettings decreased by approxi-mately 52.56%and 66.66%,respectively,with decreasing net *** drag and lift coefficients of the nylon netting were appro-ximately 17.15%and 6.72%lower than those of the polyethylene netting.A spatial development of turbulent flow occurred around the netting because of the netting ***,the flow velocity reduction downstream from the netting in the wake region in-creased with increasing attack angle and net *** addition,the deformation,stress,and strain on each netting increased with in-creasing solidity ratio.

关键词： netting k-ωshear stress turbulent(SST)model porous media model large deflection nonlinear structural model hydrodynamic characteristics

Experiment and simulation research of storage for small grain steel silo

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International Journal of Agricultural and Biological Engineering 2016年第3期9卷 170-178页

作者： Zhang Ledao Chen Xi Liu Hang Peng Wei Zhang Zhongjie Ren Guangyue College of Food and Biology Engineering Henan University of Science and TechnologyLuoyang 4710123China Academy of State Administration of Grain Beijing 100038China

Knowing the temperature distribution in silo is a convenient and efficient way to control the process of grain storage.A three-dimensional(3-D)numerical model was used to study the temperature variation in small grain steel silo under quasi-steady *** this study,experiments were conducted and porous media model was *** of numerical simulation and experiment were compared and the results indicated that grain temperature was influenced by temperature of the wall,grain stacking height,and the distance between grain and *** higher the wall temperature,the more the temperature *** the wall temperature is low,the effect of wall temperature on temperature distribution is *** temperature at the top part of grain varied obviously with the changes of temperature in air ***,numerical simulation results coincided with experimental results and the model established in this study is valuable for predicting grain temperature in steel silo.

关键词： small grain steel silo quasi-steady state storage numerical simulation porous media model grain storage

Experimental and numerical research on squat silo and large size horizontal warehouse during quasi-steady-state storage

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International Journal of Agricultural and Biological Engineering 2016年第6期9卷 214-222页

作者： Ren Guangyue Liu Yanan Peng Wei Duan Xu Zhang Ledao College of Food and Bioengineering Henan University of Science&TechnologyLuoyang 471023China

Traditional method to prevent stored grain from deterioration is to control grain temperature.A three dimensional(3-D)numerical model was established to study the temperature variation in outdoor squat silo and large size horizontal warehouse at *** this research,porous media model and solar radiation model were *** and experimental results showed that grain temperature was influenced by temperature of wall,height of grain and the distance between grain and the *** changes dramatically at the top layer of grain heap due to solar radiation and heat convection at air *** of grain close to wall increased with the increasing of ambient *** model established in this research is suitable for predicting grain temperature in outdoor squat silo and large size horizontal warehouse.

关键词： squat silo large size horizontal warehouse porous media model solar radiation model three dimensional numerical model grain temperature quasi-steady-state storage