Capillarity‐induced resonance of oil blobs in capillary tubes and porous media

Geophysics ◽  
2000 ◽  
Vol 65 (3) ◽  
pp. 874-883 ◽  
Author(s):  
Markus Hilpert ◽  
Gerhard H. Jirka ◽  
Erich J. Plate
Keyword(s):  
Porous Media ◽  
Model Systems ◽  
Coarse Grained ◽  
Sound Waves ◽  
Contact Lines ◽  
Phase Contact ◽  
Capillary Tubes ◽  
Fine Grained ◽  
Three Phase ◽  
Analytical Expressions

We investigate the excitation by sound waves of capillary trapped oil blobs. The three‐phase contact lines either remain pinned to the heterogeneities of the solid surface or slide if sound waves are applied. We derive approximate, analytical expressions for the resonance of oil blobs in capillary tubes for both types of contact line behavior. Based upon these simple model systems, we conclude that resonance of oil blobs is significant for coarse‐grained but not fine‐grained media.

scholarly journals An experimental study on the determination of dispersion coefficient in layered soils

2021 ◽  
Author(s):  
Hamed Mahdipanah ◽  
Askari Tashakori ◽  
Samad Emamgholizadeh ◽  
Eisa Maroufpoor
Keyword(s):  
Porous Media ◽  
Flow Velocity ◽  
Sampling Method ◽  
Travel Distance ◽  
Coarse Grained ◽  
Contaminant Concentration ◽  
Fine Grained ◽  
Sodium Chloride Solutions ◽  
Heterogeneous Soils ◽  
Homogeneous Soil

Abstract Dispersivity is a measurable parameter in soil porous media that is used for studying the transport of contaminants to groundwater. The value of this parameter depends on various factors, including the kind of porous media (homogeneous or heterogeneous), flow velocity, initial contaminant concentration, travel distance, and sampling method. A physical model with dimensions of 0.10 m in width, 0.80 m in height, and 1.10 m in length was constructed to investigate the effects of these parameters on the dispersivity value. The stratified soil consisted of three 20-cm-thick layers containing fine-grained, medium-grained, and coarse-grained soil. Sodium chloride solutions with electrical conductivity values of 10, 14, and 19 dS/m were used as the contaminants. Flow was forced through the layered heterogeneous soils at three discharge velocities of 17.58, 22.02, and 26.18 × 10−5 m/s. The point and mixed sampling methods were used. The results indicated that the soil dispersivity values in the layered heterogeneous soils and homogeneous soil were influenced by contaminant concentration, flow velocity, and travel distance. Moreover, the dispersivity values obtained by point sampling were lower than those obtained using the mixed sampling method, and the mean dispersivity value in the layered heterogeneous soils was lower than that of the homogeneous soil.

scholarly journals Sintering of a fine-grained BaCeO3 powder obtained from a co-precipitation method

2018 ◽  
Author(s):  
Roberto Köferstein
Keyword(s):  
Precursor Powder ◽  
Coarse Grained ◽  
Precipitation Method ◽  
Fine Grained ◽  
Grain Sizes ◽  
Three Phase ◽  
Sintering Behaviour ◽  
Co Precipitation ◽  
Precursor Powders ◽  
Powder Compacts

The formation of BaCeO3 by a co-precipitation method is described herein. The coprecipitationroute leads to an orange (BaCe)-precursor powder (1). To improve the sinteringbehaviour, a small amount of Ge4+ was incorporated, leading to a (BaCe0.95/Ge0.05)-precursor(2). Both precursor powders results in fine-grained preceramic powders (1A, 2A) aftercalcination. The shrinkage and sintering behaviour of resulting powder compacts were studiedin comparison to a coarse-grained mixed-oxide BaCeO3 powder (3). Compacts of 2A reach arelative density of 90 % after sintering at 1350 °C with grain-sizes between 0.9−3.2 μm. Onthe other hand ceramics of 1A and 3 have, after sintering at 1500 °C (10 h), relative densitiesof 85 % and 76 %, respectively. Ceramic bodies of 1A consisted of phase-pure orthorhombicBaCeO3, whereas bodies of 2A show reflections of BaCeO3 and a Ba2GeO4 phase. DTAinvestigations of samples 1A and 2A reveal three phase transitions at 255 °C (1A) and 256 °C (2A) as well as 383 °C (1A) and 380 °C (2A). A very weak one can be obtained in the range880−910 °C

Nucleation of the CO2 Hydrate from Three-Phase Contact Lines

Langmuir ◽  
2012 ◽  
Vol 28 (20) ◽  
pp. 7730-7736 ◽  
Author(s):  
Dongsheng Bai ◽  
Guangjin Chen ◽  
Xianren Zhang ◽  
Wenchuan Wang
Keyword(s):  
Contact Lines ◽  
Phase Contact ◽  
Three Phase

Analytic Prediction of Structural Stress-Strain Relations of Microstructured Metal

2008 ◽  
Vol 32 ◽  
pp. 83-86 ◽  
Author(s):  
Chun Hui Yang ◽  
Ilchat Sabirov ◽  
Jonathan Mullins ◽  
Peter D. Hodgson
Keyword(s):  
Structural Properties ◽  
Mean Field ◽  
Field Method ◽  
Unit Cell ◽  
Coarse Grained ◽  
Stress Strain ◽  
Fine Grained ◽  
Microstructural Parameters ◽  
Multi Scale ◽  
Three Phase

Nanostructured and ultra-fine grained metals have higher strength but extremely limited ductility compared to coarse grained metals. However, their ductility can be greatly improved by introducing a specific range of grain sizes in the microstructures. In the paper, multiscale unit cell approach (UCA) is developed and applied to predict the averaged stress-strain relations of the multiscale microstructure metals. The unit cell models are three-phase structured at different scale lengths of 100 nm, 1 μm and 10 μm with different volume fractions and periodic boundary conditions. The contributions of multi-scale microstructures to the macroscopic structural properties of metals are also studied using a analytic approach—two-step mean-field method (TSMF), where three microstructural parameters are introduced and thus mechanical properties such as strength and ductility are presented as a function of these parameters. For verification of these proposed numerical and theoretical algorithms, the structural properties of the pure nickel with three-grain microstructures are studied and the results from FEA and the proposed theory have good agreement.

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