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ISSN Online: 2379-1748

ISBN Flash Drive: 978-1-56700-472-4

ISBN Online: 978-1-56700-471-7

3rd Thermal and Fluids Engineering Conference (TFEC)
March, 4–7, 2018, Fort Lauderdale, FL, USA

TRANSIENT PERFORMANCE OF CHEMICAL, BIOLOGICAL, RADIOLOGICAL AND NUCLEAR FILTER CANISTERS

Get access (open in a dialog) pages 561-570
DOI: 10.1615/TFEC2018.cmd.021507

要約

Steady state and transient simulations have been carried out on a number of axisymmetric designs for Chemical, Biological, Radiological and Nuclear (CBRN) canister filters designed for use in air purifying respirators. A number of alterations have been made to the shape of the canister and the internal bracketing which holds the particulate filter and the carbon filter. The steady state simulations were used to inform selection of three transient cases which were analyzed in more detail with respect to the mean air age distribution throughout the carbon bed over the duration of a single breath. It was shown that the non-uniform radial voidage distribution provides a region of low mean air age close to the canister wall. In designs which did not block this region off with bracketing, it provided a potential route for breakthrough, which was more significant at low inlet velocities. At higher inlet velocities the lower mean air age was seen on a path, which is in line with the canister inlet. It may be possible to design a canister which exploits the difference in flow profile over the course of a breathing cycle in order to make more efficient use of the filter material.