Negatively buotant wall flows generated in enclosure fires

Jaluria, Yogesh; Cooper, Leonard Y.

doi:10.1016/0360-1285(89)90014-2

Cited by 36 publications

(8 citation statements)

References 20 publications

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“…Eventually, the relatively high temperature ceiling jet is blocked by the relatively cool wall surfaces [62]. The ceiling jet then turns downward and outward in a complicated flow along the vertical wall surfaces [63,64] . The descent of the wall flows and the heat transfer from them are eventually stopped by upward buoyant forces.…”

Section: Ceiling Jetmentioning

confidence: 99%

CFAST-consolidated model of fire growth and smoke transport (version 6) :

Jones¹,

Peacock²,

Forney³

et al. 2009

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Section: Ceiling Jetmentioning

confidence: 99%

CFAST-consolidated model of fire growth and smoke transport (version 6) :

Jones¹,

Peacock²,

Forney³

et al. 2009

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“…Since the fluid considered is air, the Prandtl number is set to a value of 0.72 for normal room temperatures. The fluid properties are taken as constant since earlier work (Jaluria and Cooper, 1989;Jaluria and Kapoor, 1992) has shown that the experimental results can be well correlated by using constant properties at the film temperature. The basic trends and predictions have also been shown to be obtained accurately with the simpler constant property assumption.…”

Section: <P = Dimensionless Stream Functionmentioning

confidence: 99%

Turbulent Penetrative and Recirculating Flow in a Compartment Fire

Abib

Jaluria

1995

Journal of Heat Transfer

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A numerical study of a turbulent penetrative and recirculating flow induced by the energy input from a fire at the bottom boundary in a partially open rectangular enclosure is carried out. The compartment is connected through an opening to a long corridor, which opens into a stably stratified environment. The condition that is of interest is a stable, two-layered, temperature stratification, which is assumed to be caused by fire in an adjacent enclosure. In this study, attention is focused on the interaction between the cavity and its surrounding ambient medium through the opening. The influence of the stratification is examined in the turbulent flow regime by considering a range of stratification levels for given opening height and initial interface location. It is found that, depending on the stratification, the thermal plume above the fire may never reach the ceiling. Small penetration distances occur at large stratification levels. The flow field reveals a multicellular pattern: a strong main convective cell at the bottom and a weak counterrotating cell at the top. The stable thermal stratification can cause a destruction of the turbulence. This results in the relaminarization of the flow in the upper region of the cavity and may significantly affect the transport processes in the enclosure. This could distort the simplistic concept of two homogeneous gas layers, which forms the basis of zone modeling for compartment fires.

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“…Eventually, the relatively high temperature ceiling jet is blocked by the relatively cool wall surfaces [58]. The ceiling jet then turns downward and outward in a complicated flow along the vertical wall surfaces [59], [60]. The descent of the wall flows and the heat transfer from them are eventually stopped by upward buoyant forces.…”

Section: Ceiling Jetmentioning

confidence: 99%

Verification and validation of CFAST :

Jones¹,

Peacock²,

Forney³

et al. 2004

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CFAST is a zone model capable of predicting the environment in a multi-compartment structure subjected to a fire. It calculates the time evolving distribution of smoke and fire gases and the temperature throughout a building during a user-specified fire. This report describes the equations which constitute the model, the physical basis for these equations, data which are used by the model, and details of the operation of the computer program implementing the model. This paper is an assessment of the model following the template set forth in ASTM 1355, "Standard Guide for Evaluating the Predictive Capability of Deterministic Fire Models." We include in this paper a set of comparisons between the model and a range of real-scale fire experiments is presented as the validation exercise require by the standard. In addition, we have developed a means to do a quantitative comparison between the time series represented by these predictions and those found in experiments.

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Negatively buotant wall flows generated in enclosure fires

Cited by 36 publications

References 20 publications

CFAST-consolidated model of fire growth and smoke transport (version 6) :

CFAST-consolidated model of fire growth and smoke transport (version 6) :

Turbulent Penetrative and Recirculating Flow in a Compartment Fire

Verification and validation of CFAST :

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