Eventos Anais de eventos
ENCIT 2018
Brazilian Congress of Thermal Sciences and Engineering
Experimental Investigation of the Extinction Depth for a Candle Diffusion Flame under Confinement
Submission Author:
Luiz Eduardo Melo Lima , PR
Co-Authors:
Daniel de Sousa Lemos, Thiago Antonini Alves, Luiz Eduardo Melo Lima
Presenter: Luiz Eduardo Melo Lima
doi://10.26678/ABCM.ENCIT2018.CIT18-0253
Abstract
This work aims to analyze the instability of a diffusion flame produced by a paraffin candle, which is confined within a glass tube, observing the flame behavior and its extinction as a function of the confinement depth in the tube and the wick length. An experimental apparatus was used to carry out this analysis, in order to obtain the flame dimensions, from photographs, as well as to observe the temperature distribution and the combustion gases release, from thermal images. The confinement depth and the flame dimensions were obtained using an image processing program, considering two candles with different wick lengths. The temperature distribution was observed from the thermal images showing the highest temperatures in the flame region. The candle with smaller wick did not extinguish the flame, even at the maximum confinement length. The candle with larger wick extinguished the flame for a 48 mm confinement depth. The wick length increase results in higher fuel vaporization rates and higher flame volume. This produces a greater amount of combustion gases, that difficult the oxidant arrival in the flame and together with the confinement influences the magnitudes of the diffusion and convective terms of the governing equations in the combustion process.
Keywords
Combustion, Flame, Thermal Analysis
