Flow through a porous membrane simulated by cellular automata and by finite elements

1990 ◽  
Vol 60 (5-6) ◽  
pp. 875-887 ◽  
Author(s):  
U. Brosa ◽  
C. Kiittner ◽  
U. Werner
Keyword(s):  
Finite Elements ◽  
Cellular Automata ◽  
Porous Membrane ◽  
Flow Through

Microstructure Evolution and Bond Formation at the Contact Interface During Ultrasonic Consolidation Process

2014 ◽  
Author(s):  
Song Zhang ◽  
Lili Zheng ◽  
Hui Zhang
Keyword(s):  
Finite Elements ◽  
Cellular Automata ◽  
Applied Load ◽  
Oscillation Amplitude ◽  
Travel Speed ◽  
Process Conditions ◽  
Fe Model ◽  
Consolidation Process ◽  
Ultrasonic Consolidation ◽  
Al 7075

In this paper a cellular automata-finite elements (CAFE) model is developed by combining traditional finite elements (FE) model and cellular automata (CA) model. The microstructure under different process conditions of ultrasonic consolidation (UC) process for Al 7075 is studied. It is found that higher energy input process conditions (higher applied load and sonotrode oscillation amplitude, lower sonotrode travel speed) will lead to a higher value of dynamic recrystallization (DRX) fraction for UC deposited foils. The mean dislocation density of the UC deposited material will increase with the applied load while it decreases with the increase of sonotrode travel speed and oscillation amplitude.

scholarly journals A flow-through reaction cell forin situX-ray diffraction and absorption studies of heterogeneous powder–liquid reactions and phase transformations

2011 ◽  
Vol 19 (1) ◽  
pp. 93-100 ◽  
Author(s):  
Pilar Ferrer ◽  
Iván da Silva ◽  
Juan Rubio-Zuazo ◽  
Belén F. Alfonso ◽  
Camino Trobajo ◽  
...  
Keyword(s):  
Phase Transformations ◽  
Reaction Pathway ◽  
Porous Membrane ◽  
European Synchrotron Radiation Facility ◽  
Reaction Cell ◽  
X Ray ◽  
Heterogeneous Catalytic ◽  
Absorption Studies ◽  
Heterogeneous Catalytic Processes ◽  
Flow Through

A portable powder–liquid high-corrosion-resistant reaction cell has been designed to followin situreactions by X-ray powder diffraction (XRD) and X-ray absorption spectroscopy (XAS) techniques. The cell has been conceived to be mounted on the experimental stations for diffraction and absorption of the Spanish CRG SpLine-BM25 beamline at the European Synchrotron Radiation Facility. Powder reactants and/or products are kept at a fixed position in a vertical geometry in the X-ray pathway by a porous membrane, under forced liquid reflux circulation. Owing to the short pathway of the X-ray beam through the cell, XRD and XAS measurements can be carried out in transmission configuration/mode. In the case of the diffraction technique, data can be collected with either a point detector or a two-dimensional CCD detector, depending on specific experimental requirements in terms of space or time resolution. Crystallization processes, heterogeneous catalytic processes and several varieties of experiments can be followed by these techniques with this cell. Two experiments were carried out to demonstrate the cell feasibility: the phase transformations of layered titanium phosphates in boiling aqueous solutions of phosphoric acid, and the reaction of copper carbonate and L-isoleucine amino acid powders in boiling aqueous solution. In this last case the shrinking of the solid reactants and the formation of Cu(isoleucine)2is observed. The crystallization processes and several phase transitions have been observed during the experiments, as well as an unexpected reaction pathway.

scholarly journals Modelling the variation in the behaviour of pre-fractured rocks subjected to hydraulic fracturing with permeability of the rock matrix using finite-discrete element method

2020 ◽  
Vol 205 ◽  
pp. 08001
Author(s):  
Shahrzad Roshankhah ◽  
Arman K. Nejad ◽  
Orlando Teran ◽  
Kami Mohammadi
Keyword(s):  
Rock Mass ◽  
Finite Elements ◽  
Hydraulic Fracturing ◽  
Discrete Element Method ◽  
Fractured Rocks ◽  
Discrete Element ◽  
Fracture Network ◽  
Rock Matrix ◽  
Flow Through ◽  
Element Method

In this study, we present the results of two-dimensional numerical simulations for the effects of rock matrix permeability on the behaviour of hydraulic fractures in intact and pre-fractured rocks. The simulations are performed using the Finite-Discrete Element Method (FDEM). In this method, the deformation and fluid pressure fields within the porous rock blocks, pre-existing fracture network, and hydraulically induced fractures are calculated through a fully coupled hydromechanical scheme. Furthermore, new fractures can initiate in crack elements located between each pair of finite elements and can propagate in any path that the boundary and loading conditions require according to non-linear fracture mechanics criteria. Fluid channels are also defined between pairs of finite elements simulating the inter-connected flow paths through porous media. Four models of the rock mass are created in this study: (i) homogeneous-impermeable, (ii) homogeneous-permeable, (iii) heterogeneous-impermeable matrix, and (iv) heterogeneous-permeable matrix. Heterogeneous rock masses contain a discrete fracture network (natural fractures) in the rock mass structure. Hydraulic fracturing is modelled in domains of 40×40 m2 with the four different structures and mass transport capacities, and the results are compared to each other. The results highlight the significant effect of diffusive fluid flow through rock blocks, in addition to the flow through fracture network, on the global hydromechanical behaviour of the rock mass. These results help to understand the governing hydromechanical processes taking place in fractured rocks with matrix of different permeability, such as granites, shales, carbonate rocks, and sandstones and the extent of complexities required to model their behaviour to achieve reasonable accuracy.

1423 A Study about a Micro Pump Using the Flow through the Porous Membrane by the Electric Effect

2007 ◽  
Vol 2007.2 (0) ◽  
pp. 45-46
Author(s):  
Naoya Adachi ◽  
Tomiichi Hasegawa ◽  
Takatsune Narumi ◽  
Kazunori Sorimachi
Keyword(s):  
Porous Membrane ◽  
Micro Pump ◽  
Flow Through ◽  
Electric Effect

Modelling fluid flow through a single fracture with different contacts using cellular automata

2011 ◽  
Vol 38 (8) ◽  
pp. 959-969 ◽  
Author(s):  
Peng-Zhi Pan ◽  
Xia-Ting Feng ◽  
Ding-Ping Xu ◽  
Lin-Fang Shen ◽  
Jin-Bao Yang
Keyword(s):  
Fluid Flow ◽  
Cellular Automata ◽  
Single Fracture ◽  
Flow Through

scholarly journals Optimization of the Die Topology in Extrusion Processes

2008 ◽  
Vol 43 ◽  
pp. 81-88 ◽  
Author(s):  
Thomas Kloppenborg ◽  
Marco Schikorra ◽  
Jan P. Rottberg ◽  
A. Erman Tekkaya
Keyword(s):  
Numerical Model ◽  
Finite Elements ◽  
Material Flow ◽  
Extrusion Process ◽  
Two Dimensional ◽  
Extrusion Dies ◽  
Porthole Die ◽  
Extrusion Die ◽  
Flow Through ◽  
The Difference

This paper presents the results of investigations on topology optimizations in extrusion dies. The change of material viscosity of finite elements in the numerical model is utilized to allow or to block the material flow through the finite elements in simplified two-dimensional extrusion models. Two different optimization procedures are presented. In the first part of the paper dead zones in a flat and in a porthole die were improved by enhance the streamlining of the extrusion die. In the second part an evolutionary optimization algorithm has been used to optimize the extrusion die topology in order to reduce the difference between the strand exit velocities in a multi extrusion process. Finally, both methods were sequentially combined.

scholarly journals Cellular Automata Intersection Model

2020 ◽  
Vol 5 ◽  
Author(s):  
Tim Peter Erich Vranken ◽  
Michael Schreckenberg
Keyword(s):  
Cellular Automata ◽  
Traffic Flow ◽  
Variable Number ◽  
Urban Traffic ◽  
Traffic Data ◽  
Traffic Lights ◽  
Car Following ◽  
Time Value ◽  
Intersection Model ◽  
Flow Through

This paper introduces a cellular automaton design of intersections and defines rules to model traffic flow through them, so that urban traffic can be simulated. The model is able to simulate an intersection of up to four streets crossing. Each street can have a variable number of lanes. Furthermore, each lane can serve multiple purposes at the same time, like allowing vehicles to keep going straight or turn left and/or right. The model also allows the simulation of intersections with or without traffic lights and slip lanes. A comparison to multiple empirical intersection traffic data shows that the model is able to realistically reproduce traffic flow through an intersection. In particular, car following times in free flow and the required time value for drivers that turn within the intersection or go straight through it are reproduced. At the same time, important empirical jam characteristics are retained.

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