Effect of vent aspect ratio on unsteady laminar buoyant flow through rectangular vents in large enclosures

    Authors

    A. K. Sleiti

    Comments

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    Abbreviated Journal Title

    Int. J. Heat Mass Transf.

    Keywords

    laminar unsteady buoyant flow; oscillatory flow regime; conduction now; regime; DRIVEN EXCHANGE FLOW; NATURAL-CONVECTION; HORIZONTAL PARTITION; DEPRESSURIZATION; REACTOR; MOTION; DUCTS; AIR; Thermodynamics; Engineering, Mechanical; Mechanics

    Abstract

    The effects of vent aspect ratio oil 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 it 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 cliambers. The opposing forces at the interface between the two chambers create a gravitationally unstable system, and all 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. (c) 2008 Elsevier Ltd. All rights reserved.

    Journal Title

    International Journal of Heat and Mass Transfer

    Volume

    51

    Issue/Number

    19-20

    Publication Date

    1-1-2008

    Document Type

    Article

    Language

    English

    First Page

    4850

    Last Page

    4861

    WOS Identifier

    WOS:000259654600023

    ISSN

    0017-9310

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