https://github.com/aefarrell/GasDispersion.jl

gas dispersion models for modelling chemical releases
https://github.com/aefarrell/GasDispersion.jl

chemical-engineering process-safety

Last synced: 3 months ago
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gas dispersion models for modelling chemical releases

• Host: GitHub
• URL: https://github.com/aefarrell/GasDispersion.jl
• Owner: aefarrell
• License: mit
• Created: 2021-09-04T17:06:24.000Z (about 3 years ago)
• Default Branch: main
• Last Pushed: 2023-12-19T01:17:40.000Z (11 months ago)
• Last Synced: 2023-12-20T14:11:57.349Z (11 months ago)
• Topics: chemical-engineering, process-safety
• Language: Julia
• Homepage:
• Size: 3.81 MB
• Stars: 9
• Watchers: 2
• Forks: 0
• Open Issues: 2
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

Awesome Lists containing this project

• open-sustainable-technology - GasDispersion.jl - A set of tools for atmospheric dispersion modeling of gaseous releases, such as might occur during an emergency at a chemical plant or more routinely from a stack. (Atmosphere / Atmospheric Dispersion and Transport)

README

        
# GasDispersion.jl

[![LICENSE](https://img.shields.io/badge/license-MIT-lightgrey.svg)](https://github.com/aefarrell/GasDispersion.jl/blob/main/LICENSE)

[![Documentation](https://img.shields.io/badge/docs-dev-blue)](https://aefarrell.github.io/GasDispersion.jl/dev/)

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[![Coverage](https://codecov.io/gh/aefarrell/GasDispersion.jl/branch/main/graph/badge.svg?token=PB3LOR80K2)](https://codecov.io/gh/aefarrell/GasDispersion.jl)

GasDispersion.jl is a set of tools for atmospheric dispersion modeling of

gaseous releases, such as might occur during an emergency at a chemical plant

or more  routinely from a stack. This is intended to be the level of disperson

modeling used support consequence analysis or QRA such as is described in *Lee's

Loss Prevention in the Process Industries* or the CCPS *Guidelines for

Consequence Analysis of Chemical Releases*.

## Installation

GasDispersion.jl can be installed using Julia's built-in package manager. In a

Julia session, enter the package manager mode by hitting `]`, then run the

command

```

pkg> add GasDispersion

```

## Example usage

Suppose we wish to model the dispersion of gaseous propane from a leak from a storage tank, where the leak is from a 10mm hole that is 3.5m above the ground and the propane is at 25°C and 4barg. Assume the discharge coefficient $c_{D} = 0.85$. This scenario is adapted from CCPS *Guidelines for Consequence Analysis of Chemical Releases*

First we define the scenario

```julia

using GasDispersion

propane = Substance(name="propane",

              molar_weight=0.044096,     # kg/mol

              liquid_density=526.13,     # kg/m³

              k=1.142,

              boiling_temp=231.02,       # K

              latent_heat=425740,        # J/kg

              gas_heat_capacity=1678,    # J/kg/K

              liquid_heat_capacity=2520) # J/kg/K

Patm = 101325 # Pa

P1 = 4e5 + Patm # Pa

T1 = 25 + 273.15 # K

scn = scenario_builder(propane, JetSource; 

       phase = :gas,

       diameter = 0.01,  # m

       dischargecoef = 0.85,

       temperature = T1, # K

       pressure = P1,    # Pa

       height = 3.5)     # m, height of hole above the ground

```

This generates a `Scenario` defined for a gas jet discharging into dry air

at standard conditions. Once we have this defined we can determine the

concentration at any point downwind of the release point, assuming the release

is a continuous plume, using

```julia

p = plume(scn, GaussianPlume)

```

Where `p` is a callable which returns the concentration (in vol fraction) at any point. For example at 100m downwind and at a height of 2m

```julia

p(100,0,2)

# output

0.0002006455298894473

```

See [the documentation](https://aefarrell.github.io/GasDispersion.jl/dev/) for details on the additional plume and puff models and worked examples.