Flame Heat Transfer Between Parallel Panels

Simulation results, obtained by means of application of an enthalpy based pyrolysis model, are presented. The ultimate focus concerns the potential of the model to be used in flame spread simulations. As an example we discuss vertically upward flame spread over a charring material in a parallel plate configuration. Firstly, the quality of the pyrolysis model is illustrated by means of cone calorimeter results for square (9.8 cm x 9.8 cm The simulation results are compared to experimental data, indicating that, provided that a correct flame height and corresponding heat flux are applied as boundary conditions, flame spread can be predicted accordingly, using the present pyrolysis model.

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“…Therefore, we set the convection coefficient to h = 15 W/(m 2 K) here, in line with the value reported in [3].…”

Section: Cone Calorimeter Set-upmentioning

confidence: 67%

“…fuel sootiness [3,4] is avoided. To summarise, expressions as developed in [3] for a similar set-up as the one under study in the present paper, are not applied here, but the present paper is not intended to provide an alternative for such relationships.…”

Section: Introductionmentioning

confidence: 99%

Study of vertical upward flame spread on charring materials—Part II: Numerical simulations

et al. 2010

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“…[16], were fitted to flame heat transfer measurements obtained from a larger parallel panel apparatus for which radiative heat transfer was dominant. However, the separation distance, d for the current study is only half as large (0.153 m) resulting in proportionately less radiative heat transfer and an enhanced role for convective heat transfer.…”

Section: Fire Growth Time Constantmentioning

confidence: 99%

“…The model is based on a semi-empirical treatment for radiation dominated flame heat transfer to panels characterized by: (1) fuels in terms of their flame sootiness, (2) fire heat release rates, and (3) panel width to separation aspect ratios [16]. The properties of the various corrugated paperboards used in the study (critical heat flux, flame sootiness in addition to the heats of combustion and gasification) are all obtained from small-scale measurements of ignition, combustion and pyrolysis using the FPA.…”

Section: Introductionmentioning

confidence: 99%

Upward Fire Growth over Thermally Thin Corrugated Paperboard

Khan¹,

Jamison²,

Ris³

2011

Fire Saf. Sci.

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“…Furthermore, Ingason performed free burning reduced scale (scale 1:3) and full scale tests with corrugated paper cardboard box arrays and measured the centreline temperatures and gas velocities between the racks [13]. An investigation of heat fluxes to the surface in a two parallel plate configuration and in the middle of four modelled storage racks was done by de Ris and Orloff [14]. Several different fuels were used in these studies and it was shown that the heat flux from flames is sensitive to the flame sootiness.…”

mentioning

confidence: 99%

Flame Heights and Heat Transfer in Façade System Ventilation Cavities

et al. 2018

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Abstract. The design of buildings using multilayer constructions poses a challenge for fire safety and needs to be understood. Narrow air gaps and cavities are common in many constructions, e.g. ventilated fac¸ade systems. In these construction systems flames can enter the cavities and fire can spread on the interior surfaces of the cavities. An experimental program was performed to investigate the influence of the cavity width on the flame heights, the fire driven upward flow and the incident heat fluxes to the inner surfaces of the cavity. The experimental setup consisted of two parallel facing non-combustible plates (0.8 9 1.8 m) and a propane gas burner placed at one of the inner surfaces. The cavity width between the plates ranged from 0.02 m to 0.1 m and the burner heat release rate was varied from 16.5 kW to 40.4 kW per m of the burner length. At least three repeated tests were performed for each scenario. In addition, tests with a single plate were performed. The flame heights did not significantly change for Q 0 /W < 300 kW/m 2 (where Q 0 is the heat release rate per unit length of the burner and W is the cavity width). For higher Q 0 /W ratios flame extensions up to 2.2 times were observed. When the distance between the plates was reduced or the heat release rate was increased, the incident heat fluxes to the inner surface increased along the entire height of the test setup. The results can be used for analysing methodologies for predicting heat transfer and fire spread in narrow air cavities.

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Flame Heat Transfer Between Parallel Panels

Abstract: ABSTRACT

Cited by 21 publications

References 7 publications

Study of vertical upward flame spread on charring materials—Part II: Numerical simulations

Study of vertical upward flame spread on charring materials—Part II: Numerical simulations

Upward Fire Growth over Thermally Thin Corrugated Paperboard

Flame Heights and Heat Transfer in Façade System Ventilation Cavities

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