Generation and Propagation of Shock Waves in Submillimeter Capillaries

Kai, Yuichi; Garen, W.; Teubner, U.

doi:10.1007/978-3-319-44866-4_71

Cited by 2 publications

(3 citation statements)

References 6 publications

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“…All this is consistent with a simple estimate based on the Sedov-Taylor expansion approach [14], where the volume expansion is modeled according to the corresponding geometry [16]: (i) accounting for the restrictions given by the cylindrical tube geometry and assuming a planar driver, (ii) supposing a spherical geometry in the early phase of shock evolution, i.e., for x D < , which later on turns to a cylindrical geometry (additional reflections at the tube walls, see sections 2 and 5, may also contribute to shock wave attenuation, but this is not considered here) or (iii) treating a volume expansion without any constraints (when the tube is absent). Like conventionally generated shock waves in tubes, the LPP-induced shock wave also has a speed-up phase ( b t ).…”

Section: Shock Wave Generationsupporting

confidence: 83%

“…The shock wave propagation in the tube is investigated by a laser differential interferometer (LDI), which is a modification of the arrangement published earlier in [50,16]. The experimental setup is presented in figure 11.…”

Section: Methodsmentioning

confidence: 99%

“…Jiang and Takayama [13] have shown that the laser-plasma induced shock wave is approximately a blast wave created by a point-like explosion, which can be described by self-similarity methods [14]. More recently, fundamental investigations on unconfined propagation of shock waves generated with fs-lasers have also been extended to microscale [15,16].…”

Section: Introductionmentioning

confidence: 99%

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Laser-plasma induced shock waves in micro shock tubes

et al. 2017

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Shock wave generation with help of lasers or shock tubes, for example, is a common subject at macroscopic scale. On the other hand, the current tendency towards smaller scales becomes more and more important. In particular, shock waves in small channels or tubes with sub-mm or micron-sized diameter have attracted much interest within the last years. But downscaling of shock wave effects such as pressure decrease and Mach number attenuation during propagation, viscous and heat effects, laminar and turbulent flow is not necessarily straightforward from macro to micro or even nano range. Although several theoretical investigations are available in this new field, there is a strong demand on experiments, which are mostly missing due to the lack of suitable methods. The present work introduces a novel method for the generation of shock waves at microscale, namely laserinduced micro shock waves (LIMS). The LIMS method applies a femtosecond laser to induce an optical breakdown in a thin aluminum target located at the entrance of a micro tube. Subsequently, a shock wave is launched by the high pressure aluminum plasma and starts propagating into the tube. The topical work presents, for the first time, experimental investigations on direct micro shock wave generation and propagation at well-defined conditions in micron-sized tubes. They are performed for different conditions and tubes down to 50 μm diameter. Different from previous shock wave investigations in the mm-diameter range that involve pressure transducers, the present work applies non-contact measurements by optical methods. The experiments are supported by additional simulations. A one-dimensional numerical hydrocode is applied to simulate the shock wave generation process. Further propagation of the shock in a micro tube is analyzed by solving twodimensional Navier-Stokes equations. Both simulations agree well with the experimental results. Nomenclature L t laser pulse duration (fs-laser) E L laser pulse energy (fs-laser)

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Section: Shock Wave Generationsupporting

confidence: 83%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Laser-plasma induced shock waves in micro shock tubes

et al. 2017

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A novel shock tube with a laser–plasma driver

et al. 2017

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A novel method to generate shock waves in small tubes is demonstrated. A femtosecond laser is applied to generate an optical breakdown an aluminum film as target. Due to the sudden appearance of this non-equilibrium state of the target, a shock wave is induced. The shock wave is further driven by the expanding high-pressure plasma (up to 10 Mbar), which serves as a quasi-piston, until the plasma recombines. The shock wave then propagates further into a glass capillary (different square capillaries with hydraulic diameter D down to 50 µm are applied). Shock wave propagation is investigated by laser interferometry. Although the plasma is an unsteady driver, due to the geometrical confinement of the capillaries, rather strong micro shocks can still propagate as far as 35 times D. In addition to the experiments, the initial conditions of this novel method are investigated by hydrocode simulations using MULTI-fs.

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Generation and Propagation of Shock Waves in Submillimeter Capillaries

Cited by 2 publications

References 6 publications

Laser-plasma induced shock waves in micro shock tubes

Laser-plasma induced shock waves in micro shock tubes

A novel shock tube with a laser–plasma driver

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