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# Airborne Infection in a Fully Air-Conditioned Hospital: III. Transport of Gaseous and Airborne Particulate Material along Ventilated Passageways

O. M. Lidwell
The Journal of Hygiene
Vol. 75, No. 1 (Aug., 1975), pp. 45-56
Stable URL: http://www.jstor.org/stable/3862036
Page Count: 12
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## Abstract

A mathematical model is described for the transport of gaseous or airborne particulate material between rooms along ventilated passageways. Experimental observations in three hospitals lead to a value of about $0\cdot 06\ {\rm m}.^{2}/{\rm sec}$. for the effective diffusion constant in air without any systematic directional flow. The 'constant' appears to increase if there is any directional flow along the passage, reaching about $0\cdot 12\ {\rm m}.^{2}/{\rm sec}$. at a flow velocity of 0·04 m./sec. Together with previously published methods the present formulae make it possible to calculate the expected average amounts of gaseous or particulate material that will be transported from room to room in ventilated buildings in which the ventilation and exchange airflows can be calculated. The actual amounts transported in occupied buildings, however, vary greatly from time to time.

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