scholarly journals Dissolution Mass Transfer of Trapped Phase in Porous Media

2021 ◽  
Author(s):  
Anindityo Patmonoaji ◽  
Yingxue Hu ◽  
Chunwei Zhang ◽  
Tetsuya Suekane
Keyword(s):  
Mass Transfer ◽  
Porous Media ◽  
Interfacial Area ◽  
Image Processing Techniques ◽  
Capillary Trapping ◽  
Micro Tomography ◽  
Dissolution Ratio ◽  
Physical And Mathematical Models ◽  
Processing Techniques

Dissolution mass transfer of trapped phase (TP) to flowing phase (FP) in porous media plays significant roles in hydrogeology, e.g., groundwater contamination by non-aqueous phase liquids, groundwater in-situ bioremediation, and geological carbon sequestration. In this chapter, this phenomenon is described. First, the physical and mathematical models are given. Afterwards, various conditions affecting this process, i.e., porous media characteristics, capillary trapping characteristics, flow bypassing, TP characteristics, and FP velocity, are discussed. These various conditions are described based on three parameters affecting the dissolution mass transfer: TP interfacial area ( A ), TP dissolution ratio ( ξ ), and mass transfer coefficient ( k ). Eventually, models to predict the mass transfer are formulated based on non-dimensional model. All of the data in this chapter are based on the experiments obtained by using micro-tomography and a series of image processing techniques from our latest works.

Measured Mass Transfer Coefficients in Porous Media Using Specific Interfacial Area

2005 ◽  
Vol 39 (20) ◽  
pp. 7883-7888 ◽  
Author(s):  
Jaehyun Cho ◽  
Michael D. Annable ◽  
P. Suresh C. Rao
Keyword(s):  
Mass Transfer ◽  
Porous Media ◽  
Interfacial Area ◽  
Transfer Coefficients ◽  
Mass Transfer Coefficients ◽  
Specific Interfacial Area ◽  
Measured Mass

Measurement of NAPL–water interfacial areas and mass transfer rates in two-dimensional flow cell

2016 ◽  
Vol 74 (9) ◽  
pp. 2145-2151 ◽  
Author(s):  
Muzi Li ◽  
Yuanzheng Zhai ◽  
Li Wan
Keyword(s):  
Mass Transfer ◽  
Interfacial Area ◽  
Chemical Oxidation ◽  
Flow Cell ◽  
Two Dimensional ◽  
Transfer Rates ◽  
Dimensional Flow ◽  
Interfacial Areas ◽  
Two Dimensional Flow

The nonaqueous-phase liquid (NAPL)–water interfacial area and the mass transfer rate across the NAPL and water interface are often key factors in in situ groundwater pollution treatment. In this study, the NAPL–water interfacial area and residual NAPL saturation were measured using interfacial and partitioning tracer tests in a two-dimensional flow cell. The results were compared with previous column and field experiment results. In addition, the mass transfer rates at various NAPL–water interfacial areas were investigated. Fe2+-activated persulfate was used for in situ chemical oxidation remediation to remove NAPL gradually. The results showed that the reduction of NAPL–water interfacial areas as well as NAPL saturation by chemical oxidation caused a linear decrease in the interphase mass transfer rates (R2 = 0.97), revealing the relationship between mass transfer rates and interfacial areas in a two-dimensional system. The NAPL oxidation rates decreased with the reduction of interfacial areas, owing to the control of NAPL mass transfer into the aqueous phase.

Investigation on the effect of particle size in dissolution mass transfer inside porous media with micro-tomography

2020 ◽  
Author(s):  
Anindityo Patmonoaji ◽  
Yingxue Hu ◽  
Chunwei Zhang ◽  
Kento Tsuji ◽  
Tetsuya Suekane
Keyword(s):  
Mass Transfer ◽  
Particle Size ◽  
Porous Media ◽  
Effect Of Particle Size ◽  
Micro Tomography

Using Air-Lift Pumping as an in-Situ Aquifer Remediation Technique

1993 ◽  
Vol 27 (7-8) ◽  
pp. 195-201 ◽  
Author(s):  
H. Gvirtzman ◽  
S. M. Gorelick
Keyword(s):  
Mass Transfer ◽  
Porous Media ◽  
Organic Compounds ◽  
Air Bubbles ◽  
In Situ Remediation ◽  
Aquifer Remediation ◽  
Volatile Organic ◽  
Air Lift ◽  
Combined Technique

The global attempt to protect and restore the major water resources encouraged hydrologists to develop new, simple and effective aquifer remediation methods. A new in-situ remediation procedure is proposed to remove Volatile Organic Compounds (VOC) dissolved in groundwater. This is accomplished by injection of air into a well, using a combined technique of air-lift pumping with a form of vapor stripping. The feasibility of the proposed method was analyzed using concepts of mass transfer of VOCs from water to air-bubbles and transport of VOCs in porous media.

scholarly journals Automatic method for estimation of in situ effective contact angle from X-ray micro tomography images of two-phase flow in porous media

2017 ◽  
Vol 496 ◽  
pp. 51-59 ◽  
Author(s):  
Alessio Scanziani ◽  
Kamaljit Singh ◽  
Martin J. Blunt ◽  
Alberto Guadagnini
Keyword(s):  
Contact Angle ◽  
Porous Media ◽  
Flow In Porous Media ◽  
Phase Flow ◽  
Automatic Method ◽  
Two Phase ◽  
X Ray ◽  
Effective Contact ◽  
Micro Tomography

A Review on Cornea Imaging and Processing Techniques

2020 ◽  
Vol 16 (3) ◽  
pp. 181-192 ◽  
Author(s):  
James Deva Koresh Hezekiah ◽  
Shanty Chacko
Keyword(s):  
Surgical Planning ◽  
Thickness Measurement ◽  
Optimal Method ◽  
Image Processing Techniques ◽  
Related Disease ◽  
Essential Parameter ◽  
Layer Segmentation ◽  
Processing Techniques ◽  
Cornea Thickness

Background: Measuring cornea thickness is an essential parameter for patients undergoing refractive Laser-Assisted in SItu Keratomileusis (LASIK) surgeries. Discussion: This paper describes about the various available imaging and non-imaging methods for identifying cornea thickness and explores the most optimal method for measuring it. Along with the thickness measurement, layer segmentation in the cornea is also an essential parameter for diagnosing and treating eye-related disease and problems. The evaluation supports surgical planning and estimation of the corneal health. After surgery, the thickness estimation and layer segmentation are also necessary for identifying the layer surface disorders. Conclusion: Hence the paper reviews the available image processing techniques for processing the corneal image for thickness measurement and layer segmentation.

Three-Dimensional Structure of Rotavirus-Fab Complex

1990 ◽  
Vol 48 (1) ◽  
pp. 238-239
Author(s):  
B.V.V. Prasad ◽  
E. Marietta ◽  
J.W. Burns ◽  
M.K. Estes ◽  
W. Chiu
Keyword(s):  
Image Processing ◽  
Smooth Surface ◽  
Three Dimensional ◽  
Outer Shell ◽  
Dimensional Structure ◽  
Structural Studies ◽  
Cell Penetration ◽  
Electron Cryomicroscopy ◽  
Image Processing Techniques ◽  
Processing Techniques

Rotaviruses are spherical, double-shelled particles. They have been identified as a major cause of infantile gastroenteritis worldwide. In our earlier studies we determined the three-dimensional structures of double-and single-shelled simian rotavirus embedded in vitreous ice using electron cryomicroscopy and image processing techniques to a resolution of 40Å. A distinctive feature of the rotavirus structure is the presence of 132 large channels spanning across both the shells at all 5- and 6-coordinated positions of a T=13ℓ icosahedral lattice. The outer shell has 60 spikes emanating from its relatively smooth surface. The inner shell, in contrast, exhibits a bristly surface made of 260 morphological units at all local and strict 3-fold axes (Fig.l).The outer shell of rotavirus is made up of two proteins, VP4 and VP7. VP7, a glycoprotein and a neutralization antigen, is the major component. VP4 has been implicated in several important functions such as cell penetration, hemagglutination, neutralization and virulence. From our earlier studies we had proposed that the spikes correspond to VP4 and the rest of the surface is composed of VP7. Our recent structural studies, using the same techniques, with monoclonal antibodies specific to VP4 have established that surface spikes are made up of VP4.

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