Autoignition of hydrogen/air mixtures by a thin catalytic wire

Treviño, César and Liñán Martínez, Amable and Kurdyumov, V. (2000). Autoignition of hydrogen/air mixtures by a thin catalytic wire. In: "28 Symposium (International) on Combustion", 30 July 2000 through 4 August 2000, Colorado at Boulder, Boulder, Colorado.

Description

Title: Autoignition of hydrogen/air mixtures by a thin catalytic wire
Author/s:
  • Treviño, César
  • Liñán Martínez, Amable
  • Kurdyumov, V.
Item Type: Presentation at Congress or Conference (Article)
Event Title: 28 Symposium (International) on Combustion
Event Dates: 30 July 2000 through 4 August 2000
Event Location: Colorado at Boulder, Boulder, Colorado
Title of Book: 28 Symposium (International) on Combustion
Date: 2000
Volume: 28
Subjects:
Freetext Keywords: Adsorption; Approximation theory; Catalysis; Computer simulation; Desorption; Heat convection; Heat losses; Hydrogen; Ignition; Palladium; Rate constants; Reynolds number; Surface reactions; Thermal effects; Catalytic ignition; Thin catalytic wires; Mixed gas fuels
Faculty: E.T.S.I. Aeronáuticos (UPM)
Department: Motopropulsión y Termofluidodinámica [hasta 2014]
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

The autoignition of the catalytic reaction of hydrogen/air mixtures on thin palladium wires is analyzed in this paper. The reduced heterogeneous kinetics is modeled with a mechanism that includes the dissociative adsorption of both reactants, together with three surface reactions of the Langmuir-Hinshelwood type, and the desorption reaction of the adsorbed product, H2O(s). We show that for the description of the ignition conditions, this mechanism can be simplified to a single overall surface reaction involving the temperature and gas concentrations of the reactants at the surface of the wire. The resulting overall rate for the surface reaction has been tested with existing experimental results, after describing the transport of heat and reactants, by natural convection, in the gas phase for a wide range of Rayleigh numbers. The critical conditions for the catalytic ignition have been deduced using high activation energy asymptotics for the desorption kinetics of the most efficiently adsorbed reactant, H(s).

More information

Item ID: 918
DC Identifier: http://oa.upm.es/918/
OAI Identifier: oai:oa.upm.es:918
Deposited by: Archivo Digital UPM
Deposited on: 22 Apr 2009
Last Modified: 20 Apr 2016 06:35
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