Direct determination of contact angles of model soils in comparison with wettability characterization by capillary rise

2010 ◽  
Vol 382 (1-4) ◽  
pp. 10-19 ◽  
Author(s):  
Juan Carlos Ramírez-Flores ◽  
Jörg Bachmann ◽  
Abraham Marmur
Keyword(s):  
Capillary Rise ◽  
Direct Determination ◽  
Contact Angles

Wettability Characterization from Pore-Scale Images Using Topology and Energy Balance with Implications for Recovery and Storage

2021 ◽  
Author(s):  
Martin Blunt ◽  
Luke Kearney ◽  
Abdulla Alhosani ◽  
Qingyang Lin ◽  
Branko Bijeljic
Keyword(s):  
Contact Angle ◽  
Porous Media ◽  
Energy Balance ◽  
Accurate Determination ◽  
Direct Determination ◽  
Contact Angles ◽  
Pore Scale ◽  
Three Phase ◽  
And Storage

Abstract We present two methods to measure contact angles inside porous media using high-resolution images. The direct determination of contact angle at the three-phase contact line is often ambiguous due to uncertainties with image segmentation. Instead, we propose two alternative approaches that provide an averaged assessment of wettability. The first uses fundamental principles in topology to relate the contact angle to the integral of the Gaussian curvature over the fluid-fluid meniscus. The advantage of this approach is that it replaces the uncertain determination of an angle at a point with a more accurate determination of an integral over a surface. However, in mixed-wet porous media, many interfaces are pinned with a hinging contact angle. For predictive pore-scale models, we need to determine the contact angle at which displacement occurs when the interfaces move. To address this problem we apply an energy balance, ignoring viscous dissipation, to estimate the contact angle from the meniscus curvature and changes in interfacial areas and saturation. We apply these methods to characterize wettability on pore-scale images of two- and three-phase flow. We also discuss the implications of the results for recovery and storage applications.

The Direct Determination of I131 in Heterogeneous Fecal Specimens

1961 ◽  
Vol 41 (4) ◽  
pp. 380-384 ◽  
Author(s):  
Arthur F. Dratz ◽  
James C. Coberly
Keyword(s):  
Direct Determination

A New Method for Direct Determination of the Recoilless Fraction with Application to Magnetic Nanoparticles

2002 ◽  
Vol 721 ◽  
Author(s):  
Monica Sorescu
Keyword(s):  
Room Temperature ◽  
Average Particle Size ◽  
Direct Determination ◽  
Average Particle ◽  
Lattice Method ◽  
Recoilless Fraction ◽  
Single Room ◽  
Magnetite Particles ◽  
Physical Mixtures

AbstractWe propose a two-lattice method for direct determination of the recoilless fraction using a single room-temperature transmission Mössbauer measurement. The method is first demonstrated for the case of iron and metallic glass two-foil system and is next generalized for the case of physical mixtures of two powders. We further apply this method to determine the recoilless fraction of hematite and magnetite particles. Finally, we provide direct measurement of the recoilless fraction in nanohematite and nanomagnetite with an average particle size of 19 nm.

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