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Theoretical investigation on submicron particle penetration through circular tubes inside a porous medium

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Particuology 2022年第11期70卷 55-63页

作者： Yanrong Yu Yongwei Gao Yanming Kang School of Environmental Science and Engineering Donghua UniversityShanghai 201620China School of Physics and Electronic-Electrical Engineering Ningxia UniversityYinchuan 750021China

The analytical infinite series solution of submicron particle transport in a circular tube bounded by a porous wall,such as a pinhole,is determined under the slip velocity boundary condition,and the solution is verified by using the experimental data in the previous studies for the specific cases.The results show that particle penetration rate increases with the increase of the porous parameter,the axial pressure drop,and the pinhole radius,whereas it decreases with increasing the pinhole length.The penetration rate of nano-particles are more sensitive to the variation of these parameters.However,the differences between the penetrations of particles ranging from 0.3μm to 1μm are not evident because the diffusion becomes weak gradually in this size range.In addition,a further comparison is performed between the analytical solution and the existing studies,and approximate expressions are presented for accurate calculation of particle penetration rate through pinholes appearing in porous materials including filter devices and masks.

关键词： Porous medium Penetration Submicron particle circular tube Analytical solution

Experimental study by PIV of swirling flow induced by trapezoid-winglets

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Journal of Hydrodynamics 2013年第6期25卷 919-928页

作者：车翠翠田茂诚张冠敏冷学礼 School of Energy and Power Engineering Shandong University

The characteristics of the longitudinal vortex induced by trapezoid-winglets in a circular tube are investigated by the Particle Image Velocimetry （PIV） Technique with flow Reynolds number in the range of 500-13 000. In the experimental test section, four trapezoid-winglets are fixed symmetrically on the tube wall in two different ways： up-flow and down-flow. The results show that a counter-rotating vortex pair is formed behind each winglet and they distribute as a symmetrical vortex array in the transverse section. Between the two vortexes in a vortex pair the fluid flows towards the wall in the up-flow winglet case and away from the wall in the down-flow winglet case, corresponding also to the regions of peak values of the velocity components normal to the mainstream. Both of the flow patterns enhance the velocity in the near wall region, leading to the intensification of the transverse mixing and the mass transfer in the tube. With Reynolds number increasing, the flow maintains the vortex pattern in the case of the up-flow winglets, indicating better persistence of the longitudinal vortex, while the vortexes in the case of the down-flow winglets are more scattered and tend to breaking into small eddies. The trapezoid winglet shows the preferable turbulent disturbance characteristics in the tube and the experimental results provide benchmark data for further CFD studies.

关键词： longitudinal vortex Particle Image Velocimetry （PIV） trapezoid-winglets circular tube

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Experimental study of an ellipsoidal particle in tube Poiseuille flow

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Journal of Hydrodynamics 2020年第3期32卷 616-622页

作者： Yuan-feng Cui Xiang-ting Chang Hai-bo Huang Department of Modern Mechanics University of Science and Technology of ChinaHefei 230026China

Behaviors of a prolate ellipsoid inside circular tube Poiseuille flow are studied experimentally. In the study, Reynolds number Re ∈ (100,700) and the confinement ratio D/A ∈ (1.2,2.8) are considered, where D is the diameter of the tube and A is the length of the major axis of the ellipsoid. Two typical stable motion modes are identified, namely, the horizontal, and inclined modes. Then another inclined mode (inclined mode II) is found at high Reynolds number (Re ∈ (1000,3200)) and small D/A, and the inclined angle of ellipsoid increases with the increase of Re. The possible mechanism is explained. Our experiment shows that the lagging velocity U increases as Re increases. Further numerical analysis using FLUENT shows that due to the increase of U, the moment acting on the particle would make the inclined angle of the particle increase.

关键词： Ellipsoidal particle Poiseuille flow circular tube experiment

Local　Denting　Deformation　of　Perfectly　Plastic-rigid　circular　tubes　under　a　Transverse　Concentrated　Load

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太原理工大学学报 1997年第1期 100-104页

作者： Cheng GuoqiangMale,born in 1969,postgraduate. Zhang Shanyuan (Research Inst.of Applied Mech.)

ＬｏｃａｌＤｅｎｔｉｎｇＤｅｆｏｒｍａｔｉｏｎｏｆＰｅｒｆｅｃｔｌｙＰｌａｓｔｉｃ┐ｒｉｇｉｄＣｉｒｃｕｌａｒＴｕｂｅｓｕｎｄｅｒａＴｒａｎｓｖｅｒｓｅＣｏｎｃｅｎｔｒａｔｅｄＬｏａｄＣｈｅｎｇＧｕｏｑｉａｎｇ... 详细信息

ＬｏｃａｌＤｅｎｔｉｎｇＤｅｆｏｒｍａｔｉｏｎｏｆＰｅｒｆｅｃｔｌｙＰｌａｓｔｉｃ┐ｒｉｇｉｄＣｉｒｃｕｌａｒＴｕｂｅｓｕｎｄｅｒａＴｒａｎｓｖｅｒｓｅＣｏｎｃｅｎｔｒａｔｅｄＬｏａｄＣｈｅｎｇＧｕｏｑｉａｎｇＺｈａｎｇＳｈａｎｙｕａｎ（Ｒｅｓ...

关键词： perfectly plastic rigid circular tube denting deformation

带有两条共线内边界裂纹的圆管的扭转应力强度因子(英文)

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哈尔滨工业大学学报 1988年第4期 119-121页

作者：盖秉政郑志强哈尔滨工业大学力学系

tubes of equal straightness in great numbers are being widely used in engineering today. Therefore, it is of practical value to study the crack features.In the present paper, an algorithm is presented to solve the torsional problem of the circular tube of equal straightness which has two collinear internal boundary cracks of arbitrary position and length in its cross section, and formulas are given to calculate the stress intensity factors at the crack

关键词： circular tube collinear internal boundary cracks torsion stress intensity factor.