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Proceedings Paper

Steady-state modes of heterogeneous exothermic reactions on metal surface in interference light field
Author(s): Yakov A. Imas; Mikhail N. Libenson
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Paper Abstract

Stationary temperature fields existed on metal surface we studied in the case of heterogeneous exothermic reaction activation by two intensive inter fering beams. Analitical solution suitable for any variations of external pa rameters was obtained in the case of discontinuous temperature function for chemical thermal source. Realization conditions for stationary inhomogeneous distributions were found. Transitional modes responsible for bistability and hysteresis phenomena were investigated. '' Experimental possibilities of interf e rometric technique were analysed. 1 . THEORETICAL The study of macroscopic inhomogeneous effects in catalytic systems on the kinetics of chemical reactions is of immense interest for science and techno logy1. For this purpose vast possibilities are offered by the interferometric technique ensuring experimental reactivity modeling of a spatiallyperiodic surface energy source. With the existance of nonlinearities reaction exother mic effect in particular instabilities and dissipative structures can occur in the system. In the present paper the theoretical study is carried out for the behaviour of such a system with the discontinuous temperature function of the chemical heat source. For a one-dimensional system let two continuous-wave laser beams produce interference pattern with intensity q(1+pcoskx) on the surface of a thermally thin plate(catalyst). Here j. z is the percentage modulation k is the spatial frequency L is one halfperiod. The catalyst is exposed to ex ternal convection condition with heat extraction coefficient environment j$ temperature I . Metal absorbability is assumed to

Paper Details

Date Published: 1 October 1990
PDF: 5 pages
Proc. SPIE 1352, 1st Intl School on Laser Surface Microprocessing, (1 October 1990); doi: 10.1117/12.23699
Show Author Affiliations
Yakov A. Imas, S.I. Vavilov State Optical Institute (Russia)
Mikhail N. Libenson, S.I. Vavilov State Optical Institute (Russia)

Published in SPIE Proceedings Vol. 1352:
1st Intl School on Laser Surface Microprocessing
Ian W. Boyd; Vitali I. Konov; Boris S. Luk'yanchuk, Editor(s)

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