Critical Conditions for the Ignition of a Gel Fuel under Different Heating Schemes

A model was developed to research the critical conditions and time characteristics of the ignition of gel fuels in the course of conductive, convective, radiant and mixed heat transfer. MATLAB was used for numerical modeling. Original MATLAB code was established pursuant to the developed mathematica...

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Autores principales:	Olga Gaidukova, Pavel Strizhak
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	gel fuel conductive heating radiant heat flux convective heat flux ignition critical conditions Technology T
Acceso en línea:	https://doaj.org/article/191d241021be45e18b4f82bb73d33d9a
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id	oai:doaj.org-article:191d241021be45e18b4f82bb73d33d9a
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spelling	oai:doaj.org-article:191d241021be45e18b4f82bb73d33d9a2021-11-11T15:53:08ZCritical Conditions for the Ignition of a Gel Fuel under Different Heating Schemes10.3390/en142170831996-1073https://doaj.org/article/191d241021be45e18b4f82bb73d33d9a2021-10-01T00:00:00Zhttps://www.mdpi.com/1996-1073/14/21/7083https://doaj.org/toc/1996-1073A model was developed to research the critical conditions and time characteristics of the ignition of gel fuels in the course of conductive, convective, radiant and mixed heat transfer. MATLAB was used for numerical modeling. Original MATLAB code was established pursuant to the developed mathematical model. For gel fuel ignition at initial temperatures corresponding to cryogenic storage conditions with different heating schemes, a numerical analysis of interconnected processes of heat and mass transfer in the chemical reaction conditions and exothermic and endothermic phase transitions was conducted. The model was tested by comparing the theoretical results with the experimental data. Dependencies were established between the key process characteristic (i.e., the ignition delay time) and the ambient temperature when the following parameters were varied: emissivity, heat emission coefficient, activation energy and pre-exponential factor of the fuel vapor oxidation reaction. The critical values of the main parameters of the energy source were determined. For these values, gel fuel ignition conditions were consistently realized for each heating scheme. The critical heat fluxes necessary and sufficient for the ignition of typical gel fuels were determined.Olga GaidukovaPavel StrizhakMDPI AGarticlegel fuelconductive heatingradiant heat fluxconvective heat fluxignitioncritical conditionsTechnologyTENEnergies, Vol 14, Iss 7083, p 7083 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	gel fuel conductive heating radiant heat flux convective heat flux ignition critical conditions Technology T
spellingShingle	gel fuel conductive heating radiant heat flux convective heat flux ignition critical conditions Technology T Olga Gaidukova Pavel Strizhak Critical Conditions for the Ignition of a Gel Fuel under Different Heating Schemes
description	A model was developed to research the critical conditions and time characteristics of the ignition of gel fuels in the course of conductive, convective, radiant and mixed heat transfer. MATLAB was used for numerical modeling. Original MATLAB code was established pursuant to the developed mathematical model. For gel fuel ignition at initial temperatures corresponding to cryogenic storage conditions with different heating schemes, a numerical analysis of interconnected processes of heat and mass transfer in the chemical reaction conditions and exothermic and endothermic phase transitions was conducted. The model was tested by comparing the theoretical results with the experimental data. Dependencies were established between the key process characteristic (i.e., the ignition delay time) and the ambient temperature when the following parameters were varied: emissivity, heat emission coefficient, activation energy and pre-exponential factor of the fuel vapor oxidation reaction. The critical values of the main parameters of the energy source were determined. For these values, gel fuel ignition conditions were consistently realized for each heating scheme. The critical heat fluxes necessary and sufficient for the ignition of typical gel fuels were determined.
format	article
author	Olga Gaidukova Pavel Strizhak
author_facet	Olga Gaidukova Pavel Strizhak
author_sort	Olga Gaidukova
title	Critical Conditions for the Ignition of a Gel Fuel under Different Heating Schemes
title_short	Critical Conditions for the Ignition of a Gel Fuel under Different Heating Schemes
title_full	Critical Conditions for the Ignition of a Gel Fuel under Different Heating Schemes
title_fullStr	Critical Conditions for the Ignition of a Gel Fuel under Different Heating Schemes
title_full_unstemmed	Critical Conditions for the Ignition of a Gel Fuel under Different Heating Schemes
title_sort	critical conditions for the ignition of a gel fuel under different heating schemes
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/191d241021be45e18b4f82bb73d33d9a
work_keys_str_mv	AT olgagaidukova criticalconditionsfortheignitionofagelfuelunderdifferentheatingschemes AT pavelstrizhak criticalconditionsfortheignitionofagelfuelunderdifferentheatingschemes
_version_	1718433032381136896

Critical Conditions for the Ignition of a Gel Fuel under Different Heating Schemes

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