Experimental study of the transverse diffusion of pollutants through a downward plane jet in a room

Guangyu Cao*, Simo Kilpeläinen, Kai Sirén

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review


Recently, a new type of ventilation method known as protected zone ventilation has been studied for application to the prevention of indoor contaminants transported from one zone to another. The use of a downward plane jet plays a key role in a protected zone ventilation system. The objective of this study is to examine the transmission of contaminants through a downward plane jet in a room with gaseous contaminants. Experimental measurements were carried out in a full-scale test room under isothermal conditions at Aalto University, Finland. The results showed that the measured concentration profiles may match the calculated profiles when the supplied air velocity is higher than 1.5 m/s, by which the downward plane jet may separate the room into two zones with different concentrations. The results of this study may be used to guide the design and optimisation of protected zone ventilation systems.

Original languageEnglish
Pages (from-to)81-92
Number of pages12
JournalInternational Journal of Ventilation
Issue number2
Early online date1 Oct 2017
Publication statusPublished - 3 Apr 2018
MoE publication typeA1 Journal article-refereed


  • air velocity
  • contaminant
  • Downward plane jet
  • plane jet
  • protected occupied zone ventilation
  • transverse diffusion

Fingerprint Dive into the research topics of 'Experimental study of the transverse diffusion of pollutants through a downward plane jet in a room'. Together they form a unique fingerprint.

Cite this