Growth rate and the cutoff wavelength of the Darrieus-Landau instability in laser ablation

Journal Article · Thu Oct 15 04:00:00 EDT 2009 · Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics (Print)

DOI:https://doi.org/10.1103/PHYSREVE.80.046403· OSTI ID:21294427

Modestov, Mikhail; Bychkov, Vitaly; Valiev, Damir; Marklund, Mattias ^[1]

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1. Department of Physics, Umeaa University, 901 87 Umeaa (Sweden)

The main characteristics of the linear Darrieus-Landau instability in the laser ablation flow are investigated. The dispersion relation of the instability is found numerically as a solution to an eigenvalue stability problem, taking into account the continuous structure of the flow. The results are compared to the classical Darrieus-Landau instability of a usual slow flame. The difference between the two cases is due to the specific features of laser ablation: sonic velocities of hot plasma and strong temperature dependence of thermal conduction. It is demonstrated that the Darrieus-Landau instability in laser ablation is much stronger than in the classical case. In particular, the maximum growth rate in the case of laser ablation is about three times larger than that for slow flames. The characteristic length scale of the Darrieus-Landau instability in the ablation flow is comparable to the total distance from the ablation zone to the critical zone of laser light absorption. The possibility of experimental observations of the Darrieus-Landau instability in laser ablation is discussed.

• OSTI ID: 21294427
• Journal Information: Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics (Print), Journal Name: Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics (Print) Journal Issue: 4 Vol. 80; ISSN 1539-3755
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABLATION
ABSORPTION
DISPERSION RELATIONS
EIGENFUNCTIONS
EIGENVALUES
FLAMES
HOT PLASMA
LASERS
LIGHT TRANSMISSION
MATHEMATICAL SOLUTIONS
NUMERICAL ANALYSIS
PLASMA INSTABILITY
PLASMA PRODUCTION
PLASMA SIMULATION
TEMPERATURE DEPENDENCE
THERMAL CONDUCTION
VISIBLE RADIATION
WAVELENGTHS