A Chemical Engineer’s Notebook
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All (32)
air quality (4)
atmotube (2)
blowdown (2)
bowling (1)
building infiltration (3)
chemical releases (3)
coffee (2)
compressible flow (7)
dispersion modelling (14)
dynamical systems (1)
elections (1)
equations of state (2)
explosions (1)
hazard screening (5)
hydrogen (3)
integral plume models (1)
julia (28)
mass transfer (2)
plastic (1)
pollen (1)
pressure relief (2)
python (3)
turbulent jets (3)

The Ooms Plume Model
julia
dispersion modelling
integral plume models

An integral plume model for buoyant plumes.

Allan Farrell
Jun 15, 2025

Logging data from an Atmotube PRO over Bluetooth
python
air quality
atmotube

Having fun with data logging.

Allan Farrell
May 19, 2025

Mapping Pollen Dispersion
julia
dispersion modelling
pollen

Calculating how far the wind blows.

Allan Farrell
May 10, 2025

Vessel Blowdown - Real Gases
julia
compressible flow
blowdown
equations of state

Modelling vessel blowdowns using equations of state.

Allan Farrell
Mar 19, 2025

Vessel Blowdown - Ideal Gases
julia
compressible flow
blowdown

Evaluating approaches to ideal gas blowdowns.

Allan Farrell
Jan 24, 2025

Relief Valve Sizing with Real Gases
julia
pressure relief
compressible flow
equations of state

Compressible orifice flow calculations using equations of state.

Allan Farrell
Oct 28, 2024

Modelling Hydrogen Releases Using HyRAM+
python
hydrogen
dispersion modelling

Hydrogen plume modelling and indoor accumulation.

Allan Farrell
Sep 22, 2024

Plastics Recycling and Microplastics
plastic

Is plastic recycling a huge source of microplastics?

Allan Farrell
Jul 14, 2024

Engineering a Cup of Coffee Part Two: Espresso
julia
coffee
mass transfer

Modelling espresso bed extraction.

Allan Farrell
Mar 23, 2024

Estimating the impact of fugitive emissions
julia
hydrogen
compressible flow

Evaluating the zero emissions fuel.

Allan Farrell
Jan 3, 2024

Impossible bowling
python
bowling

Looking for impossible bowling games.

Allan Farrell
Nov 26, 2023

Messing around with model parameters
julia
dispersion modelling

The importance of choosing the right references.

Allan Farrell
Oct 30, 2023

Engineering a Cup of Coffee
julia
coffee
mass transfer

Better coffee through chemical engineering.

Allan Farrell
Sep 15, 2023

Monitoring smoke infiltration
julia
air quality
atmotube
building infiltration

Better indoor air quality through data.

Allan Farrell
May 22, 2023

Taking a second look at the Britter-McQuaid model
julia
dispersion modelling

Re-evaluating plume extents and determining the explosive mass

Allan Farrell
Mar 12, 2023

Integrating a Gaussian puff - mistakes were made
julia
dispersion modelling

Successive approximations to … an integrated gaussian puff model.

Allan Farrell
Jan 15, 2023

Dynamic Mode Decomposition
julia
dynamical systems

Dynamic mode decomposition of fluid flow problems.

Allan Farrell
Dec 18, 2022

Hydrogen Blending
julia
hydrogen
compressible flow

Blending hydrogen into natural gas.

Allan Farrell
Nov 10, 2022

Adiabatic Compressible Flow in a Pipe
julia
compressible flow

Evaluating different models of adiabatic pipe flow.

Allan Farrell
Sep 23, 2022

Between a puff and a plume
julia
dispersion modelling

An integrated Gaussian puff model

Allan Farrell
Jun 10, 2022

More on Turbulent Jets
julia
dispersion modelling
turbulent jets

Calculating concentrations, temperatures, and flow rates.

Allan Farrell
May 8, 2022

Turbulent Jets
julia
dispersion modelling
turbulent jets

Notes on turbulent jets and velocity profiles.

Allan Farrell
Apr 8, 2022

The 2021 Canadian Federal Election
julia
elections

An analysis of how exceptionally little changed.

Allan Farrell
Sep 22, 2021

Smoke Days
julia
air quality

Frequency of forest fire smoke events.

Allan Farrell
Jul 18, 2021

Building Infiltration Example – Chlorine Release
julia
dispersion modelling
building infiltration
hazard screening

Single zone building infiltration model with an instantaneous release

Allan Farrell
Jun 19, 2021

Building Infiltration Example
julia
air quality
building infiltration

Single zone building infiltration of forest fire smoke.

Allan Farrell
May 22, 2021

Turbulent Jet Example - Acetylene Leak
julia
chemical releases
hazard screening
dispersion modelling
turbulent jets

Estimating the explosive mass.

Allan Farrell
Apr 10, 2021

VCE Example - Butane Vapour Cloud
julia
chemical releases
hazard screening
dispersion modelling
explosions

Using the Baker-Strehlow-Tang model for a vapour cloud explosion.

Allan Farrell
Jan 9, 2021

Worst Case Meterological Conditions
julia
dispersion modelling

The worst case weather conditions for air dispersion modeling.

Allan Farrell
Dec 12, 2020

Air Dispersion Example - Gaussian Dispersion Model of Stack Emissions
julia
hazard screening
dispersion modelling

Estimating the airborne quantity.

Allan Farrell
Dec 5, 2020

Compressible Flow Example - Sizing a Goose Neck Vent
julia
compressible flow
pressure relief

Calculating the minimum diameter in incompressible, isothermal, and adiabatic flow situations.

Allan Farrell
Nov 28, 2020

Chemical Release Screening Example - Butane leak
julia
chemical releases
hazard screening

Estimating the airborne quantity.

Allan Farrell
Nov 20, 2020
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