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Discussions on critical velocity and critical Froude number for smoke control in tunnels with longitudinal ventilation
RISE - Research Institutes of Sweden, Safety and Transport, Safety.ORCID iD: 0000-0001-7744-2390
RISE - Research Institutes of Sweden, Safety and Transport, Safety.ORCID iD: 0000-0002-9340-6768
2018 (English)In: Fire safety journal, ISSN 0379-7112, E-ISSN 1873-7226, Vol. 99, p. 22-26Article in journal (Refereed) Published
Abstract [en]

Determination of critical velocity is a key issue for smoke control in any tunnel with longitudinal ventilation. The critical Froude model using single Froude number of 4.5 has for decades been widely used in engineering applications. This value was originally used by Danziger and Kennedy and they argued that the critical Froude number obtained by Lee et al. was in a range of 4.5 and 6.7 and therefore a conservative value of 4.5 was obtained. This paper explores the validity of using single critical Froude number of 4.5 by investigating the original sources and comparing it to recent research results. It was found that the value of 4.5 obtained in the original source corresponds to a large tunnel fire and it correlates well with data from other literature within a narrow range of large fire sizes. Using this value produces a significantly lower critical velocity for a wide range of fire sizes and therefore it is not conservative. The Froude number of 6.7 obtained by Lee et al. corresponds to another Froude number with a different definition and it is therefore not comparable with the value of 4.5. It is found that the use of a single value of 4.5 for the critical Froude number is not reasonable in calculation of the critical velocity for smoke control in tunnels with longitudinal ventilation.

Place, publisher, year, edition, pages
2018. Vol. 99, p. 22-26
Keywords [en]
Critical Froude number, Critical velocity, Longitudinal ventilation, Tunnel fire, Fires, Froude number, Longitudinal control, Smoke, Smoke abatement, Velocity, Conservative value, Critical velocities, Engineering applications, Froude modeling, Lower critical, Recent researches, Tunnel fires, Ventilation
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Natural Sciences
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URN: urn:nbn:se:ri:diva-34305DOI: 10.1016/j.firesaf.2018.06.002Scopus ID: 2-s2.0-85049337369OAI: oai:DiVA.org:ri-34305DiVA, id: diva2:1236840
Available from: 2018-08-06 Created: 2018-08-06 Last updated: 2018-08-24Bibliographically approved

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Li, Ying ZhenIngason, Haukur

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