Simulation of intraluminal gas transport processes in the microcirculation

1995 ◽  
Vol 24 (S1) ◽  
pp. 1-24 ◽  
Author(s):  
J. David Hellums ◽  
Pretep K. Nair ◽  
Nancy S. Huang ◽  
Norio Ohshima
Keyword(s):  
Gas Transport ◽  
Transport Processes

Effects of freezing, growth, and ice cover on gas transport processes in laboratory seawater experiments

2009 ◽  
Vol 36 (5) ◽  
Author(s):  
B. Loose ◽  
W. R. McGillis ◽  
P. Schlosser ◽  
D. Perovich ◽  
T. Takahashi
Keyword(s):  
Gas Transport ◽  
Ice Cover ◽  
Transport Processes

Membrane Ventilating Tube for the Middle Ear

1976 ◽  
Vol 85 (2_suppl) ◽  
pp. 270-276 ◽  
Author(s):  
Erdem I. Cantektn ◽  
Charles D. Bluestone
Keyword(s):  
Pilot Study ◽  
Eustachian Tube ◽  
Middle Ear ◽  
Gas Transport ◽  
Transport Model ◽  
Preliminary Investigation ◽  
Semipermeable Membrane ◽  
Transport Processes ◽  
Tympanostomy Tube ◽  
Partial Pressures

A pilot study was conducted to evaluate the efficacy of a membrane ventilating tube as a Eustachian tube prosthesis in 20 patients with otitis media. The design was based partly on assumptions since many of the physiological parameters required to calculate the gas transport processes have not been previously reported. An elementary gas transport model with assumed partial pressures of gases was developed. A semipermeable membrane covering a tympanostomy tube was fashioned and used to ventilate the middle ear cavity. From this preliminary investigation, the device successfully maintained atmospheric pressures in the tympanum, compensated for Eustachian tube malfunction, prevented otorrhea and recurrence of middle ear effusions.

Gas transport and storage capacity in shale gas reservoirs – A review. Part A: Transport processes

2015 ◽  
Vol 12 ◽  
pp. 87-122 ◽  
Author(s):  
Yves Gensterblum ◽  
Amin Ghanizadeh ◽  
Robert J. Cuss ◽  
Alexandra Amann-Hildenbrand ◽  
Bernhard M. Krooss ◽  
...  
Keyword(s):  
Shale Gas ◽  
Storage Capacity ◽  
Gas Transport ◽  
Transport Processes ◽  
Gas Reservoirs ◽  
Shale Gas Reservoirs ◽  
And Storage

scholarly journals Gas transport in granular compacted bentonite: coupled hydro-mechanical interactions and microstructural features

2020 ◽  
Vol 195 ◽  
pp. 04008
Author(s):  
Laura Gonzalez-Blanco ◽  
Enrique Romero ◽  
Paul Marschall
Keyword(s):  
Gas Flow ◽  
Gas Transport ◽  
Initial Conditions ◽  
Gas Injection ◽  
Transport Processes ◽  
Dry Density ◽  
Gas Migration ◽  
Micro Computed Tomography ◽  
Saturation State ◽  
Compacted Bentonite

The initial conditions (dry density and saturation state), the stress state and its history, and the deformation undergone during gas migration, affect the gas transport processes in granular compacted bentonite. Additionally, the sample microstructure set on compaction has a significant influence since gas tends to flow through preferential pathways. This experimental study intends to shed light on the gas transport and their coupled hydro-mechanical interactions with particular emphasis in the changes of the pore and pathway network. Controlled volume-rate gas injection followed by shut-off and dissipation stages have been performed under oedometer conditions. The microstructure of the samples has been characterised with three different techniques before and after the gas injection tests: Mercury Intrusion Porosimetry (MIP), Field-Emission Scanning Electron Microscopy (FESEM) and X-ray Micro-Computed Tomography (μ-CT). The results show a coupling of the deformational behaviour during the gas flow, revealing an expansion of the samples upon the development of gas pathways, which have been detected with the microstructural techniques. The opening of these pressure-dependent and connected pathways plays a major role in gas migration.

scholarly journals A dual porosity model of high-pressure gas flow for geoenergy applications

2018 ◽  
Vol 55 (6) ◽  
pp. 839-851 ◽  
Author(s):  
L.J. Hosking ◽  
H.R. Thomas ◽  
M. Sedighi
Keyword(s):  
High Pressure ◽  
Carbon Sequestration ◽  
Mass Exchange ◽  
Gas Flow ◽  
Gas Transport ◽  
Fracture Network ◽  
Porous Matrix ◽  
Transport Processes ◽  
Dual Porosity ◽  
Geological Carbon Sequestration

This paper presents the development of a dual porosity numerical model of multiphase, multicomponent chemical–gas transport using a coupled thermal, hydraulic, chemical, and mechanical formulation. Appropriate relationships are used to describe the transport properties of nonideal, reactive gas mixtures at high pressure, enabling the study of geoenergy applications such as geological carbon sequestration. Theoretical descriptions of the key transport processes are based on a dual porosity approach considering the fracture network and porous matrix as distinct continua over the domain. Flow between the pore regions is handled using mass exchange terms and the model includes equilibrium and kinetically controlled chemical reactions. A numerical solution is obtained with a finite element and finite difference approach and verification of the model is pursued to build confidence in the accuracy of the implementation of the dual porosity governing equations. In the course of these tests, the time-splitting approach used to couple the transport, mass exchange, and chemical reaction modules is shown to have been successfully applied. It is claimed that the modelling platform developed provides an advanced tool for the study of high-pressure gas transport, storage, and displacement for geoenergy applications involving multiphase, multicomponent chemical–gas transport in dual porosity media, such as geological carbon sequestration.

Gas transport processes in sintering of an iron-boron carbide powder composite

1989 ◽  
Vol 28 (8) ◽  
pp. 618-622 ◽  
Author(s):  
Yu. V. Turov ◽  
B. M. Khusid ◽  
L. G. Voroshnin ◽  
B. B. Khina ◽  
I. L. Kozlovskii
Keyword(s):  
Boron Carbide ◽  
Gas Transport ◽  
Transport Processes ◽  
Powder Composite ◽  
Carbide Powder

scholarly journals Modeling of Gas Permeation through Mixed-Matrix Membranes Using Novel Computer Application MOT

2018 ◽  
Vol 8 (7) ◽  
pp. 1166 ◽  
Author(s):  
Aurelia Rybak ◽  
Aleksandra Rybak ◽  
Petr Sysel
Keyword(s):  
Gas Transport ◽  
Gas Permeation ◽  
Transport Processes ◽  
Experimental Results ◽  
Computer Application ◽  
Mixed Matrix Membranes ◽  
Hybrid Membranes ◽  
Mixed Matrix ◽  
Average Absolute Relative Error ◽  
Matrix Membranes

The following article proposes a modern computer application MOT (Membrane Optimization Tool) for modeling of gas transport processes through mixed-matrix membranes (MMMs). The current version of the application is based on the Maxwell model, which can be successfully used to model gas transport through the simplest types of hybrid membranes without any defects. The application has been verified on the example of four types of hybrid membranes, consisting of various types of polymer matrix, such as: poly (vinyl acetate), 2, 2′-BAPB + BPADA, Ultem, hyperbranched polyimide (ODPA-MTA) and zeolite 4A. The average absolute relative error (AARE) and root-mean-square error (RMSE) were calculated in order to compare the theoretical MOT-predicted results with the experimental results. It was found that the AARE ranges from 29% to 36%, while the RMSE is in the range of 10% to 29%. The article presents also the comparison of MOT-predicted data obtained with Maxwell and Bruggeman models. To obtain more accurate reproduction of experimental results, further versions of the proposed application will be extended with next-generation permeation models (Lewis–Nielsen, Pal, modified Maxwell or Felske models), allowing for the description of transport in more complex systems with the possibility of taking into account possible defects.

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