Extent of the reverse flow wake region produced by a body in a uniform flow field

Irma Welling, Ilpo Kulmala, Ing-Marie Andersson, Gunnar Rosen, Timo Mielo, Keijo Marttinen, Arto Säämänen, Raimo Niemelä

    Research output: Contribution to journalArticleScientificpeer-review

    3 Citations (Scopus)


    A reverse flow is created in front of an object placed in a uniform air stream that originates from behind the object. Gaseous contaminants may then be transported into the breathing zone of a worker from sources located within the reverse flow region. This should be taken into consideration when local ventilation systems are designed. The objective of this study was to characterize the reverse flow zone created in front of a worker in a uniform flow of air,using both experimental data and numerical simulation. Experiments were carried out by moving a point contaminant source on a table placed in front of the worker, and by measuring the contaminant concentration at nose level in front of the worker. The experimentally estimated length of the reverse flow region was smallest (0.5-1.0 m) with a nominal freestream velocity of 0.1 m/s, and similar (1.1-1.4 m) with nominal freestream velocities of 0.3 and 0.5 m/s.
    Original languageEnglish
    Pages (from-to)900-904
    Number of pages5
    JournalApplied Occupational and Environmental Hygiene
    Issue number9
    Publication statusPublished - 2001
    MoE publication typeA1 Journal article-refereed


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