Micro-Scale Numerical Simulation of Water Migration in Plant-Based Materials During Isothermal Drying

PurposeThe purpose of this paper is to perform the thermo-hydro-mechanical (THM) numerical analysis in order to study the thawing process for frozen soil and to predict the thawing settlement.Design/methodology/approachA new one-dimensional multi-field physical coupled model was proposed here to describe the thawing process of saturated frozen soil, whereby the void ratio varied linearly with effective stress (Eq. 10) and hydraulic conductivity (Eq. 27b). The thawing process was simulated with different initial and boundary conditions in an open system with temperature variations. The mechanical behavior and water migration of the representative cases were also investigated.FindingsThe comparisons of representative cases with experimental data demonstrated that the model predicts thawing settlement well. It was found that the larger temperature gradient, higher overburden pressure and higher water content could lead to larger thawing settlement. The temperature was observed that to distribute height linearly in both frozen zone and unfrozen zone of the sample. Water migration forced to a decrease in the water content of the unfrozen zone and an increase in water content at the thawing front.Research limitations/implicationsIn this study, only the one-directional thawing processes along the frozen soil samples were investigated numerically and compared with test results, which can be extended to two-dimensional analysis of thawing process in frozen soil.Originality/valueThis study helps to understand the thawing process of frozen soil by coupled thermo-hydro-mechanical numerical simulation.

Download Full-text

Huff and puff process optimization in micro scale by coupling laboratory experiment and numerical simulation

Fuel ◽

10.1016/j.fuel.2018.03.085 ◽

2018 ◽

Vol 224 ◽

pp. 289-301 ◽

Cited By ~ 16

Author(s):

Damian Janiga ◽

Robert Czarnota ◽

Jerzy Stopa ◽

Paweł Wojnarowski

Keyword(s):

Numerical Simulation ◽

Laboratory Experiment ◽

Process Optimization ◽

Micro Scale

Download Full-text

Modelling of textile composite reinforcements on the micro-scale

Autex Research Journal ◽

10.2478/v10304-012-0047-z ◽

2014 ◽

Vol 14 (1) ◽

pp. 28-33 ◽

Cited By ~ 15

Author(s):

Oliver Döbrich ◽

Thomas Gereke ◽

Chokri Cherif

Keyword(s):

Numerical Simulation ◽

Finite Element Analysis ◽

Computational Cost ◽

Textile Composite ◽

Element Analysis ◽

Simulation Tools ◽

Micro Scale ◽

Generating Method ◽

Geometrical Effects ◽

Composite Reinforcements

Abstract Numerical simulation tools are increasingly used for developing novel composites and composite reinforcements. The aim of this paper is the application of digital elements for the simulation of the mechanical behaviour of textile reinforcement structures by means of a finite element analysis. The beneficial computational cost of these elements makes them applicable for the use in large models with a solution on near micro-scale. The representation of multifilament yarn models by a large number of element-chains is highly suitable for the analysis of structural and geometrical effects. In this paper, a unit cell generating method for technical reinforcement textiles, using digital elements for the discretization, is introduced.

Download Full-text