modeling of underwater liquid releases slick transport evaporation
Download
Skip this Video
Download Presentation
Modeling of Underwater Liquid Releases, Slick Transport & Evaporation

Loading in 2 Seconds...

play fullscreen
1 / 29

Modeling of Underwater Liquid Releases, Slick Transport & Evaporation - PowerPoint PPT Presentation


  • 137 Views
  • Uploaded on

Modeling of Underwater Liquid Releases, Slick Transport & Evaporation. V.M. Fthenakis and U.S. Rohatgi Department of Advanced Technology Brookhaven National Laboratory. Discharge Model. APG Spill from a Barge in Mississipi River -Baton Rouge, Louisiana. Overview.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' Modeling of Underwater Liquid Releases, Slick Transport & Evaporation' - boyd


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
modeling of underwater liquid releases slick transport evaporation

Modeling of Underwater Liquid Releases, Slick Transport & Evaporation

V.M. Fthenakis and U.S. Rohatgi

Department of Advanced Technology

Brookhaven National Laboratory

overview
Overview
  • Consequence analysis requires modeling of 1) discharge, 2) transport in water, 3) evaporation and 4) atmospheric dispersion
  • Previous discharge models limited to initial hydrostatic pressure difference (Dodge, 1980; Fannelop, 1994) . A new discharge model was developed
  • Oil slick transport in rivers (Shen & Yapa, 1988)
  • Multicomponent evaporation ( PAVE)
  • Atmospheric Dispersion (ALOHA, ISC)
modeling
Modeling
  • Discharge Model
    • Phase 1- Initial hydrostatic pressure difference
    • Phase 2- Periodic vessel movements
  • Verification & Sensitivity Analysis
  • Spreading & Evaporation Model
  • Application to Real Incident
  • Atmospheric Dispersion Modeling
  • Verification of Predicted Concentrations
discharge model
Discharge Model
  • Assumptions:
  • Isothermal Outflow and/or Inflow
  • Incompressible, Immiscible fluids;
  • Ideal gas expansion in the vessel’s void space
  • Based on analytical solutions for non-vented and vented vessels; discharges due to hydrostatic pressure and periodic oscillations from waves and bouncing

The model predicts

  • Water inflows / fluid-and-water outflows with time
  • Change of void space and fluid inventory with time
  • Change of water level in the barge with time
  • Critical water layer thickness and inventory in steady-state
discharge model phase 1 verification
Discharge Model -Phase 1 Verification
  • Experimental data (Dodge et al., 1980)
discharge model sensitivity analysis
Discharge Model- Sensitivity Analysis
  • Gas-phase pressure
  • Temperature & Saturation Pressure
  • Depth of the break
  • Area of the break
  • Discharge coefficient
  • Fluid density
  • Amplitude of vessel movement
  • Period of vessel movement
river spreading modeling
River Spreading Modeling
  • Advection of the slick due to river currents and the wind
  • Spreading of the slick due to gravitational, inertia, viscous and surface tension forces
  • Multi-component evaporation
evaporation modeling
Evaporation Modeling
  • Experimental studies -(crude oil, Payne et al. 1984; chlorobenzene and toluene, Waden and Triemer, 1989)
  • PAVE multi-component evaporation model
  • Diffusion through the liquid phase and mass transfer from surface.
  • Heat conduction to water, convection to the atmosphere, solar radiation, atmospheric radiation and evaporative cooling
  • Verified with chlorobenzene and toluene evaporation data
a barge discharge incident
A Barge Discharge Incident
  • A barge-tank containing APG overturned in the Mississippi River in March 1997
  • For days the barge was bounced by tugboats & moved by river currents leaking APG from valves under the water
  • Buoyant APG fluid floated to the surface
  • Barge was loaded with ~400,000 gal of APG and lost at least 15% of it during the incident
  • The incident lasted 11 days till barge was upheld and remaining APG recovered
conclusion
Conclusion
  • New model of underwater liquid leaks from vessel in periodic motion.
  • New model of spreading of a river spill.
  • Limited verification and sensitivity analysis showed that predictions are reasonable.
  • The models were applied to a known incident and the predictions were in agreement with observations and measurements.
  • These models may be used in real time to minimize consequences of accidental releases.
ad