Title

Effect Of Vent Aspect Ratio On Unsteady Laminar Buoyant Flow Through Rectangular Vents In Large Enclosures

Keywords

Conduction flow regime; Laminar unsteady buoyant flow; Oscillatory flow regime

Abstract

The effects of vent aspect ratio on oscillatory flow regime through a horizontal opening were studied numerically. The physical model consisted of a vertical rectangular enclosure divided into two chambers by a horizontal partition. The partitions contained a slot that connected the two chambers. The upper chamber contains cold air and the lower chamber contains hot air. A density differential due to the different temperatures drives the interaction between the two chambers. The opposing forces at the interface between the two chambers create a gravitationally unstable system, and an oscillating exchange of fluid develops. Results were obtained for cases with L/D = 1, 0.5, and 2.0, where L represents the thickness of the partition and D represents the slot width of the opening in the partition. Results indicate that the flow exchange increases with partition thickness L/D = 0.5 and decreases for L/D = 2. The frequency of the oscillatory flow pattern is also examined for the different cases. Sudden bursts of upflow with a corresponding downflow have been documented and compared with experimental observations in the literature. The time traces of velocity and temperature fields for this flow regime reveal interesting mechanisms, which have been explained. © 2008 Elsevier Ltd. All rights reserved.

Publication Date

9-1-2008

Publication Title

International Journal of Heat and Mass Transfer

Volume

51

Issue

19-20

Number of Pages

4850-4861

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1016/j.ijheatmasstransfer.2008.02.027

Socpus ID

49349115971 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/49349115971

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