Unsaturated flows

2011 ◽  
pp. 119-168 ◽  
Keyword(s):  
Unsaturated Flows

Estimation of internodal permeabilities for numerical simulation of unsaturated flows

2002 ◽  
Vol 38 (12) ◽  
pp. 62-1-62-10 ◽  
Author(s):  
Josep M. Gastó ◽  
Jordi Grifoll ◽  
Yoram Cohen
Keyword(s):  
Numerical Simulation ◽  
Unsaturated Flows

Modeling void formation and unsaturated flow in liquid composite molding processes: a survey and review

2011 ◽  
Vol 30 (11) ◽  
pp. 957-977 ◽  
Author(s):  
Chung Hae Park ◽  
Lee Woo
Keyword(s):  
Unsaturated Flow ◽  
State Of The Art ◽  
Void Formation ◽  
Pressure Profile ◽  
Liquid Composite Molding ◽  
Simulation Studies ◽  
Apparent Permeability ◽  
Composite Molding ◽  
Unsaturated Flows ◽  
Key Parameter

In this study, we present a review of the modeling of void formation and unsaturated flow in liquid composite molding processes. We examine modeling efforts considering all the mechanisms involved such as void formation and transport, bubble compression, and gas dissolution. In particular, the capillary number is identified as a key parameter for void formation and transport. Numerical simulation studies are reviewed, and a state-of-the-art is presented. The influence of microvoids on the global resin flow is also investigated. To model the unsaturated flow more accurately, we suggest considering the surface tension or capillary pressure, variation in permeability in terms of saturation and fiber displacement, as well as tow saturation. From this investigation, the apparent permeability and pressure profile in saturated and unsaturated flows are compared.

Seepage and Groundwater Flow

2015 ◽  
pp. 411-475
Keyword(s):  
Hydraulic Conductivity ◽  
Soil Mechanics ◽  
Transverse Isotropy ◽  
Flow Equation ◽  
Basic Flow ◽  
Engineering Properties ◽  
Earth Dam ◽  
Earth Dams ◽  
Unsaturated Flows

Water in soil exists in a variety of forms, affects its engineering properties, and plays a very important role in all soil mechanics problems. The effects caused by the presence of water whether at rest or when moving through the pores of the soil must therefore be properly understood. Capillarity and both saturated and unsaturated flows are considered. Methods of measuring soil suction and the hydraulic conductivity of soils in the laboratory and in-situ are highlighted. The chapter considers the permeability of stratified deposits, effective stress, and seepage pressures. Using Darcy's law and other assumptions, the basic flow equation is derived. Analytical and graphical (flow nets) methods for solving the Laplace equation are developed. Kozeny's analysis of seepage through earth dam sections using the basic parabola is introduced and the Casagrande constructions are illustrated for some homogeneous earth dams with different discharge slopes. Seepage in soils with transverse isotropy and through soils with nonhomogenous sections are analyzed. The chapter ends with a consideration of the mechanics of piping, filter, and its design.

Escherichia coli transport through intact gypsiferous and calcareous soils during saturated and unsaturated flows

Geoderma ◽  
2014 ◽  
Vol 217-218 ◽  
pp. 83-89 ◽  
Author(s):  
N. Sepehrnia ◽  
A.A. Mahboubi ◽  
M.R. Mosaddeghi ◽  
A.A. Safari Sinejani ◽  
G. Khodakaramian
Keyword(s):  
Escherichia Coli ◽  
Calcareous Soils ◽  
Unsaturated Flows

Unsaturated flows

2021 ◽  
pp. 118-177
Author(s):  
Christopher Hall ◽  
William D. Hoff
Keyword(s):  
Unsaturated Flows
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