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Effect of Gravity on Radiative Heat Feedback on Small-Scale Pool Fires Using the Radiative Absorption Model

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TLDR
In this paper, a radiative absorption model was proposed to estimate radiative heat transfer of small-scale pool fires under conditions of normal to partial gravity; using the drop tower at Hirosaki University in Japan to obtain arbitrary partial gravity condition, which varied from 1 G to 0.55 G.
Abstract
The flame characteristics of pool fires such as their height vary depending on gravity. To improve our understanding of the effects of gravity on flame characteristics, we experimentally investigated small-scale pool fires under conditions of normal to partial gravity; using the drop tower at Hirosaki University in Japan to obtain arbitrary partial gravity condition, which varied from 1 G to 0.55 G. We performed the measurement of the temperature distribution with a thermocouple and that of the flame shape with a digital camera. Based on these data, we estimated radiative heat feedback using our new model “The radiative absorption model”. It becomes easy to estimate radiative heat transfer using this model if flames have complicated shapes and time variability. From these analyses, we made clear that the radiative heat feedback of small-scale pool fires decreases under partial gravity environment.

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Book

An Introduction to Fire Dynamics

TL;DR: In this paper, the authors describe the physical chemistry of combustion in fire and discuss the physical properties of fire and its application in a wide range of applications in fire science and combustion.
Journal ArticleDOI

Thermal radiation from pool fires

TL;DR: For an axisymmetric, horizontal, pool fire of specified flame shape, effective flame radiation (Schmidt) temperature and a gray flame absorption coefficient, the analysis in this paper computes (1) radiative energy fluxes to surfaces located external to the fire in any arbitrary orientation, variations of radiative heat flux along the fuel surface, from fire center to fire edge, (2) the total radiative flux transfer from the flames to the surface, (4) forward radii from the fire to the virgin fuel bed external to fire, (5) the angular
Journal ArticleDOI

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TL;DR: In this article, an experimental and numrical investigation of ignition and the subsequent transition to flame spread over a thermally thin cellulosic sample is described, using a lamp as an external radiant source in a 50% oxygen atmosphere at three diffeirent wind velocities of 0.2, and 5 cm/s in a 10 s drop tower.
Journal ArticleDOI

The behavior of flames spreading over thin solids in microgravity

TL;DR: In this paper, the spread rate and temperature measurements in the gas and solid phases, and also recordings of the flame from ignition to extinction using two 16mm cameras, were gathered for two different oxygen levels and three different pressures.

The Effect of Microgravity on Flame Spread over a Thin Fuel

TL;DR: In this article, a flame spreading over a thermally thin cellulose fuel was studied in a quiescent microgravity environment, and two different extinction limits were found in microgravity for the two thicknesses of fuel.
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