Heat propagation from a concentrated energy source in a gas

Kurdyumov, V.; Sánchez Pérez, Antonio Luis y Liñán Martínez, Amable (2003). Heat propagation from a concentrated energy source in a gas. "Journal of Fluid Mechanics", v. 491 ; pp. 379-410. ISSN 0022-1120.

Descripción

Título: Heat propagation from a concentrated energy source in a gas
Autor/es:
  • Kurdyumov, V.
  • Sánchez Pérez, Antonio Luis
  • Liñán Martínez, Amable
Tipo de Documento: Artículo
Título de Revista/Publicación: Journal of Fluid Mechanics
Fecha: 2003
Volumen: 491
Materias:
Palabras Clave Informales: compressible flow; heat conduction; heating; shock waves; concentrated external gas energy source heat propagation; conductive region; strongly heated low density region; contact surface; outer flow piston; pressure disturbances; shock wave heating; outer compressible flow; acoustic time
Escuela: E.T.S.I. Aeronáuticos (UPM) [antigua denominación]
Departamento: Motopropulsión y Termofluidodinámica [hasta 2014]
Licencias Creative Commons: Reconocimiento - Sin obra derivada - No comercial

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Resumen

This paper investigates the heat propagation process in a gas from concentrated energy sources with deposition times, t/sub d/', of the order of the characteristic acoustic time, t/sub a/', across the region where the temperature will be increased by a factor of order of unity. Heat propagation takes place by two different neatly defined spatial regions of comparable size. Around the source, we find a conductive region of very high temperature where the spatial pressure variations are negligible. The edge of the resulting strongly heated low- density region appears as a contact surface that acts as a piston for the outer flow, where the pressure disturbances, of order of the ambient pressure in the distinguished regime t/sub d/' ~ t/sub a/' considered here, generate a shock wave that heats up the outer gas as it propagates outwards. The mass and energy balances for the conductive region provide a differential equation linking its pressure with the velocity of its bounding contact surface, which is used, together with the jump conditions across the shock, when integrating the Euler equations for the outer compressible flow. Solutions for the heating history are obtained for point, line and planar sources for different values of the ratio t/sub d/'/t/sub a/', including weak sources with t/sub d/' Gt t/sub a/' and very intense sources with t/sub d/' Lt t/sub a/'. The solution determines in particular the temperature profile emerging as the pressure perturbations become negligible for times much larger than the acoustic time

Más información

ID de Registro: 862
Identificador DC: http://oa.upm.es/862/
Identificador OAI: oai:oa.upm.es:862
URL Oficial: http://journals.cambridge.org/action/displayJournal?jid=FLM
Depositado por: Archivo Digital UPM
Depositado el: 18 Feb 2008
Ultima Modificación: 20 Abr 2016 06:34
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