Experimental Study Of Heat Transfer To Ceiling From An Impinging Diffusion Flame

Kokkala, Matti

doi:10.3801/iafss.fss.3-261

Cited by 28 publications

(5 citation statements)

References 13 publications

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“…For fires in a non‐combustible corner, work has also been performed to characterize the heat fluxes beneath a ceiling 11 . Hasemi et al, 12 You and Faeth, 13 and Kokkala, 14 for example, have all conducted experiments to measure the heat fluxes under an unconfined ceiling. Kristensen et al 15 studied the fire‐induced re‐radiation underneath photovoltaic arrays on flat roofs.…”

Section: Introductionmentioning

confidence: 99%

Experimental study and analysis of radiation heat fluxes received by a floor beneath an inclined ceiling

et al. 2020

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Summary This study experimentally investigates the radiation heat flux distribution received on the floor due to fire plume impinging upon an inclined ceiling, which has not been quantified previously. The radiation heat fluxes were measured on the floor for 160 experimental conditions, involving various fire source heat release rates, source‐ceiling heights, angles of ceiling inclination and dimensions (aspect ratios) of the rectangular sources. The main findings include that the declining rate of the radiation heat flux along with distance received by the downstream floor decreases, while that received by the upstream floor increases, with the increasing of ceiling inclination angle. The radiation heat flux received by the floor is higher as the ceiling inclination angle is smaller for the downstream side, while it is lower as the ceiling inclination angle is smaller for the upstream side. Both of these variations can be explained by change of the flow distribution as well as flame length due to combustion and heat released in the two directions beneath the inclined ceiling. Further, a model with various fire source heat release rates, source‐ceiling height, and ceiling inclination angles is proposed, to globally describe the radiation heat flux received by both the upstream and downstream floors.

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Section: Introductionmentioning

confidence: 99%

Experimental study and analysis of radiation heat fluxes received by a floor beneath an inclined ceiling

et al. 2020

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“…The test f /Hc in VTT tests was varied between 1.43-3.39. The previous Japanese investigation of a flat ceiling above a localized fire source makes it clear that heat flux q at the stagnation point depends on dimension -less height L f /Hc [ 8,9]. The correlation between the L f /Hc and heat flux to the ceiling at the stagnation point is shown in Figure 3.…”

Section: Test Conditionsmentioning

confidence: 99%

Heating Mechanism Of Unprotect4ed Steel Beam Installed Beneath Ceiling And Exposed To A Localized Fire: Verification Using The Real-scale Experiment And Effects Of The Smoke Layer

Wakamatsu¹,

Hasemi²,

Kagiya³

et al. 2003

Fire Safety Science - Proceedings of the Seventh International

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Measurements of the heating condition of a steel beam installed beneath a ceiling and exposed to a localized fire source are made on a real-scale experiment. The data of thermal response obtained from the experiments are compared with previous small-scale experiments. The effects of the smoke layer which influences upon the heating condition of the beam are investigated through the smoke experiments setting the smoke protection soffits to the same experimental equipment. FDM-based calculation is demonstrated using the average temperature of the smoke layer for the boundary conditions to predict the thermal response of the beam. Applicability of the approximated temperature of the smoke layer is examined by comparing the numerical results of the temperature with those obtained through the experiment.

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“…Significant research has been carried out on the heat transfer mechanisms in ceiling jets [10][11][12][13][14][15][16][17][18][19]. Some pioneering work was performed by Alpert [10,11], who conducted large-scale fire tests using an unconfined ceiling to investigate the ceiling jet characteristics of turbulent flames.…”

Section: Introductionmentioning

confidence: 99%

“…Using a square burner, they derived a correlation between the turbulent heat flux and the distance under the ceiling. Kokkala [14] tested natural gas fires under unconfined ceilings to measure ceiling heat flux. Chatterjee et al [16] numerically simulated the ceiling flow under unconfined and inclined ceilings with FireFOAM, the large eddy simulation based fire solver within the frame of open source computational fluid dynamics code OpenFOAM.…”

Section: Introductionmentioning

confidence: 99%

Heat fluxes under the ceiling induced by wall fires with various burner aspect ratios in a channel

Tang

Peng

Zhang

et al. 2021

Proceedings of the Combustion Institute

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Experimental Study Of Heat Transfer To Ceiling From An Impinging Diffusion Flame

Cited by 28 publications

References 13 publications

Experimental study and analysis of radiation heat fluxes received by a floor beneath an inclined ceiling

Experimental study and analysis of radiation heat fluxes received by a floor beneath an inclined ceiling

Heating Mechanism Of Unprotect4ed Steel Beam Installed Beneath Ceiling And Exposed To A Localized Fire: Verification Using The Real-scale Experiment And Effects Of The Smoke Layer

Heat fluxes under the ceiling induced by wall fires with various burner aspect ratios in a channel

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