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Analysis of factors affecting containment with extracted partial enclosures using computational fluid dynamics
1Health and Safety Laboratory, Harpur Hill, Buxton, Derbyshire SK17 9JN, UK.
The Annals of Occupational Hygiene
|November 16, 2013
Summary
Computational fluid dynamics (CFD) modelling validated experimental measurements for workplace chemical exposure control. Validated CFD simulations offer insights into engineering and containment control strategies, supporting COSHH Essentials guidelines for significant exposure reduction.
Area of Science:
- Occupational Health and Safety
- Chemical Exposure Control
- Industrial Hygiene Engineering
Background:
- The Health and Safety Executive's (HSE) COSHH Essentials provides guidance on controlling workplace chemical exposure.
- Control strategies include general ventilation, engineering control, containment, and seeking specialist advice.
- Evaluating the effectiveness of engineering and containment controls is crucial for worker safety.
Purpose of the Study:
- To examine the performance of engineering and containment control approaches using experimental measurements and computational fluid dynamics (CFD) modelling.
- To validate CFD models against experimental data for assessing chemical exposure control strategies.
- To investigate factors influencing containment performance in drum-filling scenarios.
Main Methods:
- Simulated an extracted partial enclosure (COSHH Essentials G200) for engineering control, comparing CFD predictions with experimental data.
- Simulated drum filling in an extracted partial enclosure (COSHH Essentials G305) for containment control.
- Analyzed the influence of face velocity, opening size/location, and ventilation flows on containment performance using tracer gas.
Main Results:
- CFD predictions for the engineering control approach showed good agreement with experimental measurements.
- Enclosure face velocity distribution was non-uniform, with opening size and location significantly impacting flow fields and containment.
- Containment in drum filling was affected by the interaction between ventilation flow and drum movement/spacing.
Conclusions:
- Validated CFD simulations are a valuable tool for understanding chemical exposure control strategies and interpreting experimental results.
- Containment control approaches can achieve significant reductions in potential exposure, supporting COSHH Essentials assumptions.
- Novel CFD modelling aids in designing and improving containment systems for enhanced workplace safety.
Keywords:
COSHH essentialsLEVcomputational fluid dynamicscontainmentdrum fillingengineering controlsextracted partial enclosuresMore Related Videos
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