Brassington, Gary B., Lee, Mark, and Patterson, John C. (2000) Observations of a transient stratified laminar intrusion. In: Proceedings of the 7th Heath and Mass Transfer Conference. pp. 45-51. From: 7th Australasian Heat and Mass Transfer Conference, 3-6 July 2000, Townsville, QLD, Australia.

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Abstract

A transient, stratified laminar intrusion in a side-heated cavity is observed for an extended period by using a cavity of reduced aspect ratio. Shadowgraph observations are made of the jump-like feature and trailing waves immediately downstream from the vertical boundary and of the associated development of the secondary circulation. The stratified intrusion front is initially driven by momentum flux from the vertical boundary layer and horizontal pressure gradients due to the intrusion buoyancy. When the intrusion propagates further along the horizontal boundary buoyancy losses due to conduction and momentum losses due to viscosity lead to a deceleration and a reduced heat transfer efficiency. Numerical simulations demonstrate that horizontal momentum of the intrusion is partially compensated by a horizontal pressure gradient due to a thickening of the stratified layers. The thickening is ocalised to a position downstream from the intrusion waves and upstream from the intrusion front. Downstream from the layer thickening the observations are consistent with those of a viscous gravity current. Upstream from this layer thickening an adverse pressure gradient leads to a regression and steepening of the jump-like feature and intrusion waves. For parameter values illustrated the regression leads to an interaction with the vertical boundary layer prior to the arrival of the intrusion fronts to the opposing boundaries.

Item ID:	14534
Item Type:	Conference Item (Research - E1)
ISBN:	978-1-875136-28-5
Keywords:	gravity currents; natural convection
Date Deposited:	06 Dec 2017 01:29
FoR Codes:	09 ENGINEERING > 0915 Interdisciplinary Engineering > 091505 Heat and Mass Transfer Operations @ 100%
SEO Codes:	97 EXPANDING KNOWLEDGE > 970102 Expanding Knowledge in the Physical Sciences @ 100%
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