Numerical modeling of fresh concrete flow through porous medium

2016 ◽  
Author(s):  
F. Kolařík ◽  
B. Patzák ◽  
J. Zeman
Keyword(s):  
Porous Medium ◽  
Numerical Modeling ◽  
Fresh Concrete ◽  
Flow Through ◽  
Concrete Flow

Analysis of Flow Maldistribution of Fuel and Oxidant in a PEMFC

2004 ◽  
Vol 126 (4) ◽  
pp. 262-270 ◽  
Author(s):  
Ganesh Mohan ◽  
B. Prabhakara Rao ◽  
Sarit K. Das ◽  
S. Pandiyan ◽  
N. Rajalakshmi ◽  
...  
Keyword(s):  
Porous Medium ◽  
Numerical Modeling ◽  
Analytical Approach ◽  
Flow Distribution ◽  
Close Match ◽  
Large Numbers ◽  
Flow Channeling ◽  
Flow Through ◽  
The Individual ◽  
Flow Maldistribution

The flow of fuel and oxidant through a PEMFC is analyzed for prediction of maldistribution. Flow distribution of both fuel and oxidant from the port to the individual cells critically control the performance of a PEMFC stack in combination. The distribution of fluids was simulated by analytical approach utilizing flow channeling model of a manifold. A detailed numerical modeling is also carried out considering flow in each cell between the electrodes as flow through an equivalent porous medium offering identical resistance. The results show a close match between the analytical and numerical results. The parametric study reveals that flow rate and port size plays major role determining maldistribution of the fluids, which can be considerably skewed when large numbers of cells are stacked for larger power output.

Stochastic homogenization and macroscopic modelling of composites and flow through porous media

2002 ◽  
pp. 337-378 ◽  
Author(s):  
Jozef Telega ◽  
Wlodzimierz Bielski
Keyword(s):  
Porous Medium ◽  
Random Distribution ◽  
Flow Through Porous Media ◽  
Macroscopic Models ◽  
Linear Elastic ◽  
Multi Scale ◽  
Convergence Method ◽  
Flow Through ◽  
The Mean ◽  
Random Porous Medium

The aim of this contribution is mainly twofold. First, the stochastic two-scale convergence in the mean developed by Bourgeat et al. [13] is used to derive the macroscopic models of: (i) diffusion in random porous medium, (ii) nonstationary flow of Stokesian fluid through random linear elastic porous medium. Second, the multi-scale convergence method developed by Allaire and Briane [7] for the case of several microperiodic scales is extended to random distribution of heterogeneities characterized by separated scales (stochastic reiterated homogenization). .

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