scholarly journals Addendum to “Liu H. H. (2011). A conductivity relationship for steady‐state unsaturated flow processes under optimal flow conditions. Vadose Zone Journal , 10 (2), 736–740”

2020 ◽  
Vol 19 (1) ◽  
Author(s):  
Hui‐Hai Liu
Keyword(s):  
Steady State ◽  
Vadose Zone ◽  
Unsaturated Flow ◽  
Flow Conditions ◽  
Optimal Flow ◽  
Flow Processes

Bacteria Transport and Deposition under Unsaturated Flow Conditions: The Role of Water Content and Bacteria Surface Hydrophobicity

2008 ◽  
Vol 7 (2) ◽  
pp. 406-419 ◽  
Author(s):  
G. Gargiulo ◽  
S. A. Bradford ◽  
J. Simunek ◽  
P. Ustohal ◽  
H. Vereecken ◽  
...  
Keyword(s):  
Water Content ◽  
Unsaturated Flow ◽  
Surface Hydrophobicity ◽  
Flow Conditions ◽  
Bacteria Transport

Performance Assessment of Low-Level Waste Disposal Facilities Using Coupled Unsaturated Flow and Reactive Transport Simulators

2002 ◽  
Vol 713 ◽  
Author(s):  
Diana H. Bacon ◽  
B. Peter McGrail ◽  
Vicky L. Freedman ◽  
Giancarlo Ventura ◽  
Piero Risoluti ◽  
...  
Keyword(s):  
Waste Disposal ◽  
Vadose Zone ◽  
Reactive Transport ◽  
Unsaturated Flow ◽  
Filler Materials ◽  
Release Rates ◽  
Glass Waste ◽  
Shallow Subsurface ◽  
Low Level ◽  
Reactive Chemical Transport

ABSTRACTRecent advances in the development of reactive chemical transport simulators have made it possible to use these tools in performance assessments (PAs) for nuclear waste disposal. Reactive transport codes were used to evaluate the impacts of design modifications on the performance of two shallow subsurface disposal systems for low-level radioactive waste. The first disposal system, located at the Hanford site in Richland, Washington, is for disposal of lowlevel waste glass. Glass waste blocks will be disposed in subsurface trenches, surrounded by backfill material. Using different waste package sizes and layering had a small impact on technetium release rates to the vadose zone. The second disposal system involves a hypothetical repository for low-level waste in Italy. A model of uranium release from a grout waste form was developed using the STORM reactive transport code. Uranium is predicted to be relatively insoluble for several hundred years under the high-pH environment of the cement pore water. The effect of using different filler materials between the waste packages on uranium flux to the vadose zone proved to have a negligible impact on release rates.

scholarly journals Modeling non-steady state radioisotope transport in the vadose zone – A case study using uranium isotopes at Peña Blanca, Mexico

2009 ◽  
Vol 73 (20) ◽  
pp. 6052-6064 ◽  
Author(s):  
T.L. Ku ◽  
S. Luo ◽  
S.J. Goldstein ◽  
M.T. Murrell ◽  
W.L. Chu ◽  
...  
Keyword(s):  
Steady State ◽  
Vadose Zone ◽  
Uranium Isotopes

Drawing of Tubes

1980 ◽  
Vol 47 (4) ◽  
pp. 736-740 ◽  
Author(s):  
D. Durban
Keyword(s):  
Exact Solution ◽  
Steady State ◽  
Radial Flow ◽  
Material Behavior ◽  
Wall Friction ◽  
Flow Rule ◽  
Flow Conditions ◽  
Steady State Flow ◽  
Linear Hardening ◽  
Von Mises

The process of the tube drawing between two rough conical walls is analyzed within the framework of continuum plasticity. Material behavior is modeled as rigid/linear-hardening along with the von-Mises flow rule. Assuming a radial flow pattern and steady state flow conditions it becomes possible to obtain an exact solution for the stresses and velocity. Useful relations are derived for practical cases where the nonuniformity induced by wall friction is small. A few restrictions on the validity of the results are discussed.

scholarly journals Inverse modeling of vadose zone flow processes using squared ε-insensitivity loss function

2010 ◽  
Vol 58 (3) ◽  
Author(s):  
Navin Twarakavi ◽  
Hirotaka Saito ◽  
Jirka Šimůnek ◽  
M. Van Genuchten
Keyword(s):  
Loss Function ◽  
Vadose Zone ◽  
Inverse Modeling ◽  
Flow Processes

The Effect of Stator-Rotor Hub Sealing Flow on the Mainstream Aerodynamics of a Turbine

2006 ◽  
Author(s):  
Kevin Reid ◽  
John Denton ◽  
Graham Pullan ◽  
Eric Curtis ◽  
John Longley
Keyword(s):  
Steady State ◽  
Entropy Generation ◽  
Flow Rate ◽  
Three Dimensional ◽  
Secondary Flows ◽  
Flow Conditions ◽  
Turbine Efficiency ◽  
Turbine Performance ◽  
Mainstream Flow ◽  
Flow Interactions

An investigation into the effect of stator-rotor hub gap sealing flow on turbine performance is presented. Efficiency measurements and rotor exit area traverse data from a low speed research turbine are reported. Tests carried out over a range of sealing flow conditions show that the turbine efficiency decreases with increasing sealant flow rate but that this penalty is reduced by swirling the sealant flow. Results from time-accurate and steady-state simulations using a three-dimensional multi-block RANS solver are presented with particular emphasis paid to the mechanisms of loss production. The contributions toward entropy generation of the mixing of the sealant fluid with the mainstream flow and of the perturbed rotor secondary flows are assessed. The importance of unsteady stator wake/sealant flow interactions is also highlighted.

Permeability Modeling Considering Microstructure of Preform

2007 ◽  
Vol 334-335 ◽  
pp. 437-440 ◽  
Author(s):  
Do Hoon Lee ◽  
Joon Ho Lee ◽  
Woo I. Lee
Keyword(s):  
Porous Medium ◽  
Unsaturated Flow ◽  
Manufacturing Industries ◽  
Experimental Measurements ◽  
Resin Flow ◽  
Flow Conditions ◽  
Composite Manufacturing ◽  
Liquid Molding ◽  
Flow Through ◽  
Inhomogeneous Microstructure

Liquid molding processes are becoming more popular among the composite manufacturing industries due to their versatility and economy among other merits. In analyzing the flow during the process, permeability is the most important parameter. Permeability has been regarded as a property of the porous medium. However, in many practical cases, the value may vary depending on the flow conditions such as the flow rate. It is speculated that this deviation is caused by inhomogeneous microstructure of the medium. In this study, numerical simulations as well as experimental measurements have been done to investigate the cause of deviation. Microstructure of porous medium was modeled as an array of porous cylinders. Resin flow through the array was simulated numerically. Simulations were performed for two different flow conditions, namely saturated flow and unsaturated flow. Based upon the results, permeabilities were estimated and compared for the two flow conditions. In addition, a model was proposed to predict the permeability for different flow conditions. Results showed that experimental data were in agreement with the prediction by the model.

A low-dimensional subsurface model for saturated and unsaturated flow processes: ability to address heterogeneity

2017 ◽  
Vol 21 (2) ◽  
pp. 301-314 ◽  
Author(s):  
Sylvain Weill ◽  
Frederick Delay ◽  
Yi Pan ◽  
Philippe Ackerer
Keyword(s):  
Unsaturated Flow ◽  
Flow Processes ◽  
Low Dimensional
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