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Enhancement of airborne shock wave by laser-induced breakdown of liquid column in laser shock cleaning
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Image of FIG. 1.
FIG. 1.

Schematic of laser-induced breakdown of liquid column.

Image of FIG. 2.
FIG. 2.

Experimental setup for the LIB of liquid column and visualization of shock wave generated.

Image of FIG. 3.
FIG. 3.

Schematic diagram and shadowgraph images after 500 ns at the LIB of various laser intensities: (a) I = 17.5 G W/cm2, (b) I = 32.0 GW/cm2, and (c) I = 40 GW/cm2. [Incident energy (a) Ei  = 35 mJ, (b) Ei  = 64 mJ, and (c) Ei  = 80 mJ].

Image of FIG. 4.
FIG. 4.

Shadowgraph images of (a) air breakdown, and liquid columns (D = 250 μm) at different distances s from laser focal point at Ei  = 300 mJ: (b) s = 0.5 mm, (c) s = 1.5 mm, and (d) s = 3.5 mm.

Image of FIG. 5.
FIG. 5.

Averaged shock wave velocity at 500 ns after the LIB for various column positions s. (Ei  = 300 mJ).

Image of FIG. 6.
FIG. 6.

Shock wave velocity Uy for various (a) D and (b) Ei at R y = 2 mm.

Image of FIG. 7.
FIG. 7.

Shock wave pressure and increase ratio (D = 400 μm, Ei  = 400 mJ) versus function of distance R.

Image of FIG. 8.
FIG. 8.

The fraction of transmitted energy (error bar: energy fluctuation of transmitted energy) compared with the incident energy (Et/Ei ) versus input energy.

Image of FIG. 9.
FIG. 9.

Blast wave energy and increase ratio for air and liquid column breakdown (D = 400 μm, Ei  = 400 mJ) versus transit time.


Generic image for table
Table I.

Shock wave pressure p and ratio of pressure increase at R = 2 mm for various E i and D.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Enhancement of airborne shock wave by laser-induced breakdown of liquid column in laser shock cleaning