scholarly journals Transport and deposition of spherical microparticles with single-shell in a 90 degree bend

2015 ◽  
Vol 19 (4) ◽  
pp. 1245-1248
Author(s):  
Zhen-Hua Chen ◽  
Kai Zhang ◽  
Xiao-Fei Lv ◽  
Yan-Hua Xing ◽  
Hong Jiang
Keyword(s):  
Flow Field ◽  
Finite Volume Method ◽  
Finite Volume ◽  
Theoretical Investigation ◽  
Deposition Efficiency ◽  
Bend Pipe ◽  
Volume Method ◽  
Unique Relationship ◽  
Spherical Microparticles ◽  
Single Shell

Theoretical investigation on particle transport in a 90 degree bend was carried out. The finite volume method was used to simulate the flow field in the bend pipe, and one-way coupled Lagrangian method was used to calculate the trajectory and deposition efficiency of microparticles. The unique relationship between the irreversible deposition efficiency and radius ratio of single-shell microparticle was given finally.

Numerical model of two-phase mechanical face seal with shallow grooves based on finite volume method

2020 ◽  
Vol 72 (10) ◽  
pp. 1303-1309
Author(s):  
Wenbin Gao ◽  
Weifeng Huang ◽  
Tao Wang ◽  
Ying Liu ◽  
Zhihao Wang ◽  
...  
Keyword(s):  
Flow Field ◽  
Phase Change ◽  
Finite Volume Method ◽  
Peer Review ◽  
Finite Volume ◽  
Fluid Model ◽  
Mechanical Seal ◽  
Two Phase ◽  
Content Type ◽  
Volume Method

Purpose By modeling and analyzing the two-phase mechanical seal of the fan-shaped groove end face, which is prone to phase change, an effective method to study the flow field of the mechanical seal when both cavitation and boiling exist simultaneously is found. Design/methodology/approach Based on the finite volume method, a fluid model was developed to investigate a two-phase mechanical seal. The validity of the proposed model was verified by comparing with some classical models. Findings By modeling and analyzing the two-phase mechanical seal of the fan-shaped groove end face, which is prone to phase change, the analysis of the gap flow field of the mechanical seal was realized when cavitation and boiling existed simultaneously. Originality/value Based on the model proposed for different conditions, the pressure and phase states in the shallow groove sealing gap were compared. The phase change rate between the mechanical seal faces was also investigated. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-12-2019-0537/

Comparison of Micro- and Nano-Size Particle Transport and Depositions in 90 Degree Bend Microchannel

2009 ◽  
Author(s):  
Kai Zhang ◽  
Jianzhong Lin ◽  
Mingzhou Yu
Keyword(s):  
Particle Size ◽  
Electric Field ◽  
Finite Volume Method ◽  
Finite Volume ◽  
Particle Deposition ◽  
Particle Diameter ◽  
Deposition Efficiency ◽  
Size Particle ◽  
Volume Method ◽  
Nano Size

The flow and electric field are simulated numerically with finite volume method first, then large number of nanoparticles and microparticles are injected into the microchannel separately, and these particles are traced with the Lagrangian method. It has been found that particle deposition efficiency in the bend usually decreases first then increases with particle size increasing, and there usually exists a minimum value and it corresponds to the particle diameter of about 3μm, which means that kind of particle can transport longer distance. The electric field doesn’t affect that specified value. This conclusion is helpful to the optimization of the design of microchips.

The Influence of Different Reynolds Number on Flow across Three Tandem Cylinders with Different Diameter

2014 ◽  
Vol 1079-1080 ◽  
pp. 304-308
Author(s):  
Xing Jie Gao ◽  
Hong Qing Zhang ◽  
Hui Chao Dai ◽  
Gui Wen Rong
Keyword(s):  
Reynolds Number ◽  
Circular Cylinder ◽  
Flow Field ◽  
Fluid Mechanics ◽  
Finite Volume Method ◽  
Finite Volume ◽  
Classical Problem ◽  
Single Cylinder ◽  
Tandem Cylinders ◽  
Volume Method

Flow around a circular cylinder is a classical problem in fluid mechanics. The flowing problem about three tandem cylinders with different diameter is numerical simulated by a finite volume method. Through the simulation, the variations of flow field with different distance between the adjacent cylinder and different Reynolds number are investigated. The simulation result shows that three tandem cylinders with different diameter can evidently small columns minish width and aggrandize length of cylinder wakes compared with single cylinder.

CFD Simulation of Volute of Variable Geometry Turbocharger

2012 ◽  
Vol 532-533 ◽  
pp. 287-291
Author(s):  
Jie Lei ◽  
Yan Song Wang ◽  
Hong Juan Ren
Keyword(s):  
Flow Field ◽  
Finite Volume Method ◽  
Compressible Flow ◽  
Finite Volume ◽  
Control Strategy ◽  
Cfd Simulation ◽  
Variable Geometry ◽  
Variable Geometry Turbocharger ◽  
Viscous Compressible Flow ◽  
Volume Method

To study the Volute of Variable Geometry Turbocharger (VGT) flow field and the possibility of providing the basis theory for control strategy and matching with engine, in this paper, a method is presented. The 3D viscous compressible flow in the model of volute and the vanes is simulated by CFD using FVM (Finite Volume Method). And taking some VGT as an example, the simulation is carried out. The result shows that the method can display the distribution of pressure and velocity in the model clearly. The zone and the reasons resulting in loss will be found after analyzing the results, and then the turbocharger can be optimized and redesigned purposeful to reduce the losses resulted from improper figure. The distribution of pressure and velocity at open and close vanes will be found after analyzing the results, and the basis theory for VGT control strategy and matching with engine can be provided.

scholarly journals Temperature distribution in a cigarette oven during baking

2015 ◽  
Vol 19 (4) ◽  
pp. 1201-1204 ◽  
Author(s):  
Qing Zhang ◽  
Jia-Cun Shao ◽  
Hang Zhao ◽  
Kai Zhang ◽  
Zhong-Di Su
Keyword(s):  
Temperature Field ◽  
Energy Consumption ◽  
Temperature Distribution ◽  
Flow Field ◽  
Finite Volume Method ◽  
Numerical Investigation ◽  
Finite Volume ◽  
Volume Method ◽  
The Relationship

Baking treatment is one of the most important processes of cigarette production, which can significantly enhance quality of tobacco. Theoretical and numerical investigation on temperature distribution in a cigarette oven during baking was carried out. The finite volume method was used to simulate the flow field. The relationship between the uniformity of temperature field and impeller?s speed was given finally, which is helpful to optimize cigarette oven with better quality and less energy consumption.

scholarly journals Splat Behaviour Under Substrate Temperature of 673K Via Coupling Simulation

2019 ◽  
Vol 8 (4) ◽  
pp. 6886-6890
Keyword(s):  
Flow Field ◽  
Substrate Temperature ◽  
Finite Volume Method ◽  
Compressible Flow ◽  
Finite Volume ◽  
Flow Condition ◽  
Implicit Method ◽  
Droplet Flow ◽  
Moving Particle ◽  
Volume Method

The process of collision flattening is difficult to evaluate via experiment because is normally under rapid conditioned (in μsec). Via simulation, under compressible flow condition we propose a moving particle semi implicit method (MPS) coupling with finite volume method (FVM) to examine the deformation, splitting and conjoining of liquid. The substrate temperature has been constant at 673K. The result shows that the phenomena of splat behavior have been successfully being observed. The validation of droplet flow field also being confirm visually. Besides, the substrate temperature also influences the shape of the splat.

Analysis of Flow Field in Mechanical Aortic Bileaflet Heart Valves Using Finite Volume Method

2016 ◽  
Vol 36 (1) ◽  
pp. 110-120 ◽  
Author(s):  
Feng Zhou ◽  
Yuan Yuan Cui ◽  
Liang Liang Wu ◽  
Jie Yang ◽  
Li Liu ◽  
...  
Keyword(s):  
Flow Field ◽  
Finite Volume Method ◽  
Finite Volume ◽  
Heart Valves ◽  
Volume Method

scholarly journals Using finite volume method for investigating the turbulent flow field and heat transfer of a non-Newtonian nanofluid in a channel with triangular vortex generators

2021 ◽  
Author(s):  
Muhammad Ibrahim ◽  
Tareq Saeed
Keyword(s):  
Heat Transfer ◽  
Pressure Drop ◽  
Flow Field ◽  
Turbulent Flow ◽  
Finite Volume Method ◽  
Finite Volume ◽  
Vortex Generator ◽  
Vortex Generators ◽  
Turbulent Flow Field ◽  
Volume Method

Abstract This study examines the turbulent flow field and heat transfer rate (HTR) of the non-Newtonian H2O-Al2O3-carboxymethyl (CMC) in a channel with vortex generators. The finite volume method and SIMPLE algorithm were employed for solving the partial differential equations. The mean Nusselt numbers (Num) and pressure drops were studied at angles of 30-60°, vortex generator depths of 1-3 mm, Reynolds numbers (Re) of 3000-30000, and nanoparticles volume fractions (φ) of 0.5% and 1.5%. According to the numerical results, the use of triangular vortex generators significantly incremented the Nusselt number (Nu) of the non-Newtonian nanofluid (NF), while it had a lower effect on the enhancement of pressure drop (DP). It was also indicated that a change in the vortex generator depth in the range of a few millimeters had no significant effects on the Nu and pressure drop. Moreover, a rise in the Re (i.e., more turbulent flow) significantly incremented HTR. An increase in the Re raised pressure drop; however, the Num incremented more than the pressure drop. Also, the variations of the local Nu indicated that the local Nu significantly incremented around vortex generators due to the formation of vortex flows. An enhancement in the volume fraction of the base fluid’s nanoparticles (NPs) from 0.5% to 1.5% significantly incremented HTR and the Nu.

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