TY  - BOOK
AB  - Electrodialysis is an efficient process for seawater desalination that involves
various interacting phenomena. In this process, ions are transported by
flow, diffusion and an electric force and separated by selective membranes.
For the optimization of this process, it is important to understand these
interactions. This work presents rigorous mathematical models to describe
the overall process and develops a numerical strategy for its simulation.
With this approach it becomes possible to simulate the involved physical
effects and their interactions in detail. To achieve this, the Maxwell-Stefan
equations for mixtures are used. They take into account the electrical
force and the multicomponent interactions with concentration dependent
diffusivity coefficients and thermodynamic factors. Additionally, the usual
assumption of local electroneutrality is not assumed to allow the nonideal
effects in the electrical double layer near the membrane. For the numerical
solution of these equations, the multicomponent lattice Boltzmann method
(LBM) is developed and implemented in the solver Musubi. This model
for the channel flow is coupled with an electric field and a model for the
membranes. To obtain the electric field, the LBM that solves the Poisson’s
equation is implemented in Musubi.
The channels between the membranes are realized by spacers with
complex geometry. A mesh generator (Seeder) on the basis of octrees is
developed to ensure the appropriate discretization of the mesh for these
channels. An essential part of this work is dedicated to the development
of the parallel scaling coupling tool APESmate. APESmate is developed
within the APES suite along with Seeder and Musubi on a central octree
data structure that allows efficient handing of I/O on large scale distributed
parallel computing systems.
The developed software is used to compare the nonideal multicomponent
model for various concentrations and surface potentials. The results show
that nonideal effects increase with the concentration, especially in the
electrical double layer. The spacers for various hydrodynamic angles and
inflow velocities near and away from a sealed corner are investigated to
find the design with reduced pressure drop and without low velocity zones.
The highly resolved simulations show that the pressure drop increases
with the hydrodynamic angle, while the extend of the low flow regions
decreases.
AU  - Masilamani, Kannan
DA  - 2021
DO  - 10.25819/ubsi/9888
KW  - Elektrodialyse
KW  - Lattice-Boltzmann
KW  - Multicomponent
KW  - Electrodialysis
KW  - Coupled simulations
KW  - Mulitkomponentenströmung
KW  - Gekoppelte Simulationen
LA  - eng
PY  - 2021
TI  - Framework for coupled simulation of electrodialysis processes
TT  - Konzept und Umgebung für gekoppelte Simulationen von Elektrodialyse-Prozessen
UR  - https://nbn-resolving.org/urn:nbn:de:hbz:467-18741
Y2  - 2024-11-22T11:26:22
ER  -