Environmental Hydrogeology
 |
|
|
|
- Vahid Joekar-Niasar
- room W232
Environmental Hydrogeology Group
Department of Earth
Sciences
Faculty of Geosciences
University of Utrecht
P.O. Box 80021
3508 TA UTRECHT
Phone (+31) 030 2535139
Email:
V.JoekarNiasar[AT]uu[DOT]nl
More information will be provided upon
request.
Publications in Refereed Journals
14- Joekar-Niasar, V., Schotting, R., Leijnse, A., Analytical Solution of Electro-Hydrodynamic Flow and Transport in Rectangular Channels: Inclusion of Double Layer Effects, 2012, Computational Geosciences, under review.
13. Joekar-Niasar, V., Doster, F., Armstrong, R.T., Wildenschild, D., Celia, M.A., Trapping and Hysteresis in Two-Phase Flow in Porous Media: A Pore-Network Study, 2012, Water Resources Research , under review.
12- Karadimitriou, N.K., Joekar-Niasar, V., Hassanizadeh, S.M., Kleingeld, P.J., Pyrak-Nolte, L.J., A Novel Deep Reactive Ion Etched (DRIE) Glass Micro-Model for
Two?Phase Flow Experiments, 2012, Lab on a Chip, doi: 10.1039/C2LC40530J.
11- Joekar-Niasar, V.,
Hassanizadeh, S. M., Analysis of Fundamentals of Two-Phase Flow in Porous
Media using Dynamic Pore-Network Models; A Review, 2012, Journal of Critical
Reviews in Environmental Science and Technology, doi: 10.1080/10643389.2011.574101.
10- Joekar-Niasar, V., Hassanizadeh, S. M., Effect of Initial Hydraulic Conditions on Capillary Rise in a Porous Medium; Pore-Network Modelling, 2012, Vadose Zone Journal, doi: 10.2136/vzj2011.0128.
9- Joekar-Niasar, V.,
Hassanizadeh, S. M., Uniqueness of Specific Interfacial Area-Capillary Pressure-Saturation Relationship Under Non?equilibrium Conditions in Two-Phase Porous Media Flow, 2012, Transport in Porous Media, 94:465–486, doi:10.1007/s11242?012?9958?3.
8- Joekar-Niasar, V., Hassanizadeh, S. M., Specific Interfacial Area;
the Missing State Variable in Two-Phase Flow?, 2011, Water Resources
Research, 47, W05513.[ PDF]
7- Joekar-Niasar, V., Hassanizadeh, S. M., Effect of fluids properties on
nonequilibrium capillarity effects; dynamic pore-network modelling, 2011,
International Journal of Multiphase Flow,37.198-214 .[ PDF]
6- Joekar-Niasar, V., Prodanovic, M., Wildenschild, D., Hassanizadeh S.
M., Network Model Investigation of Interfacial Area, Capillary Pressure and
Saturation Relationships in Granular Porous Media, 2010, Water Resources
Research, 46: W06526, doi:10.1029/2009WR008585.[ PDF]
5- Joekar-Niasar, V., Hassanizadeh, S. M., Dahle, H. K.,
Non-equilibrium Effects in Capillarity and Interfacial Area in Two-Phase Flow:
Dynamic Pore-Network Modelling, 2010, Journal of Fluid Mechanics
, 655: 38-71, doi:10.1017/S0022112010000704.[ PDF]
4- Joekar-Niasar, V., Hassanizadeh, S. M., Pyrak-Nolte, L. J.,
Berentsen, C., Simulating drainage and imbibition experiments in a
high-porosity micro-model using an unstructured pore-network model,
2009, Water Resources Research, 45: W02430,
doi:10.1029/2007WR006641.[ PDF]
3- Joekar-Niasar, V., Ataie-Ashtiani, B., Assessment of Nitrate
contamination in unsaturated zone of Tehran City, Iran, 2009,
Environmental Geology, 57:1785–1798, doi:
10.1007/s00254-008-1464-0 [ PDF]
2-
Joekar-Niasar, V., Hassanizadeh, S.M., Leijnse A., 2008, Insights into
the relationships among capillary pressure, saturation, interfacial area and
relative permeability using pore-network modeling, Transport in Porous
Media, 74:201–219, doi 10.1007/s11242-007-9191-7 [ PDF]
1-
Joekar-Niasar, V., Ataie-Ashtiani, B., 2006, Modeling the nitrate
contamination of unsaturated zone in Tehran: Combining lumped parameter method
and mass balance, Sharif Journal of Science &
Technology, 22: 3-12 (in Persian)
PhD Thesis Book
The immiscibles: Capillarity effects in
porous media - pore-network modelling [
info], [
full text]
abstract
Current theories of two-phase flow in
porous media are based on the so-called extended Darcy’s law, and an algebraic
relationship between capillary pressure and saturation. Both of these
equations have been challenged in recent years, primarily based on theoretical
works using a thermodynamic approach, which have led to new governing
equations for two-phase flow in porous media. In this research, these
equations and also other physical aspects of multiphase flow in porous media
are studied. To gain detailed insights into the processes and for quantitative
assessment pore-network modelling has been employed. In this work, we have
developed robust quasi-static and dynamic pore-network models. Several
quasi-static and dynamic pore-networks have been developed to study
relationships between average phase pressures, average capillary pressure, and
specific interfacial area during drainage and imbibition. Other aspects of
flow in porous media such as rapping mechanisms, saturation profile,
non-equilibrium effects in pressure and interfacial area are investigated. In
addition to the investigation of physics of multiphase flow, we have developed
new approaches for better presentation of porous media, which are employed in
quasi-static models. Quasi-static simulations are done in three different
media; a hypothetical porous medium, a two-dimensional micro-model, and a
three-dimensional glass-bead column. Capabilities of the models in simulating
experiments as well as providing more detailed information about the
experiments are shown. This may be impossible and time-consuming in laboratory
experiments. Furthermore, a dynamic pore-network model with improved numerical
features is developed. New algorithms in dynamic pore-network modelling
provide very flexible formulations to simulate the two-phase flow in different
capillary numbers and different viscosity ratios for drainage and
imbibition.
