3D simulation of dynamic barriers against fume and gaseous toxic substances.

The paper deals with a three dimensional modelling of an experimental device realized in the Department of "Fisica Tecnica" of the University of Rome "La Sapienza" in cooperation with the Italian National Council of Researchers (CNR) in order to investigate the performances of shutter type air curtains as a dynamic barrier against the diffusion of fumes or airborne toxic substances.

Mary's story. A lab design gone wrong.

Mary is a person who suffered terrible health problems, most likely stemming from the design conditions in a lab in which she worked. Designers everywhere can learn from her experience.

On the persistence of low wind speed conditions.

Light wind conditions are important in the assessment of risks from releases of hazardous gases, in the assessment of urban air quality, and also in the determination of ventilation requirements for buildings. Although very light winds would often prese

Family's CO poisoning results from an unusual source.


The fluid mechanics of natural ventilation - displacement ventilation by buoyancy-driven flows assisted by wind.

This paper describes the fluid mechanics of natural ventilation by the combined effects of buoyancy and wind. Attention is restricted to transient draining flows in a space containing buoyant fluid when the wind and buoyancy forces reinforce one another. The flows have been studied theoretically and the results compared with small-scale laboratory experiments. Connections between the enclosure and the surrounding fluid are with high-level and low-level openings on both windward and leeward faces.

A guide to efficient laboratory ventilation.