Gas-bubble snap-off under pressure driven flow in constricted noncircular capillaries

Thumbnail image of item number 1 in: 'Gas-bubble snap-off under pressure driven flow in constricted noncircular capillaries'.
Thumbnail image of item number 2 in: 'Gas-bubble snap-off under pressure driven flow in constricted noncircular capillaries'.
Thumbnail image of item number 3 in: 'Gas-bubble snap-off under pressure driven flow in constricted noncircular capillaries'.
Thumbnail image of item number 4 in: 'Gas-bubble snap-off under pressure driven flow in constricted noncircular capillaries'.
Showing 1-4 of 58 pages in this report.

PDF Version Also Available for Download.

Description

A model for snap-off of a gas thread in a constricted cornered pore is developed. The time for wetting liquid to accumulate at a pore throat into an unstable collar is examined, as for the resulting pore-spanning lens to be displaced from the pore so that snap-off is the time may repeat. A comer-flow hydrodynamic analysis for the accumulation rate of wetting liquid due to both gradients in interfacial curvature and in applied liquid-phase pressure reveals that wetting-phase pressure gradients significantly increase the frequency of liquid accumulation for snap-off as compared to liquid rearrangement driven only by differences in pore-wall ... continued below

Physical Description

53 p.

Creation Information

Kovscek, A.R. & Radke, C.J. April 1, 1996.

Context

This report is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 84 times . More information about this report can be viewed below.

Who

People and organizations associated with either the creation of this report or its content.

Authors

Sponsor

Publisher

Provided By

UNT Libraries Government Documents Department

Serving as both a federal and a state depository library, the UNT Libraries Government Documents Department maintains millions of items in a variety of formats. The department is a member of the FDLP Content Partnerships Program and an Affiliated Archive of the National Archives.

About | Browse this Partner

Contact Us

Corrections Questions

What

Descriptive information to help identify this report. Follow the links below to find similar items on the Digital Library.

Description

A model for snap-off of a gas thread in a constricted cornered pore is developed. The time for wetting liquid to accumulate at a pore throat into an unstable collar is examined, as for the resulting pore-spanning lens to be displaced from the pore so that snap-off is the time may repeat. A comer-flow hydrodynamic analysis for the accumulation rate of wetting liquid due to both gradients in interfacial curvature and in applied liquid-phase pressure reveals that wetting-phase pressure gradients significantly increase the frequency of liquid accumulation for snap-off as compared to liquid rearrangement driven only by differences in pore-wall curvature. For moderate and large pressure gradients, the frequency of accumulation increases linearly with pressure gradient because of the increased rate of wetting liquid flow along pore comers. Pore topology is important to the theory, for pores with relatively small throats connected to large bodies demonstrate excellent ability to snapoff gas threads even when the initial capillary pressure is high or equivalently when the liquid saturation is low. A macroscopic momentum balance across the lens resulting from snap-off reveals that lens displacement rates are not linear with the imposed pressure drop. Instead, the frequency of lens displacement scales with powers between 0.5 and 0.6 for pores with dimensionless constriction radii between 0.15 and 0.40. Statistical percolation arguments are employed to form a generation rate expression and connect pore-level foam generation events to macroscopic pressure gradients in porous media. The rate of foam generation by capillary snap-off increases linearly with the liquid-phase pressure gradient and according to a power-law relationship with respect to the imposed gas-phase pressure gradient.

Physical Description

53 p.

Notes

OSTI as DE96001222

Source

  • Other Information: PBD: Apr 1996

Language

Item Type

Identifier

Unique identifying numbers for this report in the Digital Library or other systems.

  • Other: DE96001222
  • Report No.: DOE/BC--96001222
  • Grant Number: AC03-76SF00098
  • DOI: 10.2172/212582 | External Link
  • Office of Scientific & Technical Information Report Number: 212582
  • Archival Resource Key: ark:/67531/metadc669980

Collections

This report is part of the following collection of related materials.

Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

About | Browse this Collection

What responsibilities do I have when using this report?

Digital Files

When

Dates and time periods associated with this report.

Creation Date

  • April 1, 1996

Added to The UNT Digital Library

  • June 29, 2015, 9:42 p.m.

Description Last Updated

  • April 5, 2016, 12:27 p.m.

Usage Statistics

When was this report last used?

Yesterday: 1
Past 30 days: 2
Total Uses: 84
More Statistics

Interact With This Report

Here are some suggestions for what to do next.

Start Reading

Thumbnail image of item number 1 in: 'Gas-bubble snap-off under pressure driven flow in constricted noncircular capillaries'.
Thumbnail image of item number 2 in: 'Gas-bubble snap-off under pressure driven flow in constricted noncircular capillaries'.
Thumbnail image of item number 3 in: 'Gas-bubble snap-off under pressure driven flow in constricted noncircular capillaries'.
Thumbnail image of item number 4 in: 'Gas-bubble snap-off under pressure driven flow in constricted noncircular capillaries'.

PDF Version Also Available for Download.

Citations, Rights, Re-Use

International Image Interoperability Framework

IIF Logo

We support the IIIF Presentation API

Links for Robots

Helpful links in machine-readable formats.

Archival Resource Key (ARK)

International Image Interoperability Framework (IIIF)

Metadata Formats

Images

URLs

Stats

Kovscek, A.R. & Radke, C.J. Gas-bubble snap-off under pressure driven flow in constricted noncircular capillaries, report, April 1, 1996; California. (digital.library.unt.edu/ark:/67531/metadc669980/: accessed February 16, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.