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Temporal and spatial effects of ablation plume on number density distribution of droplets in an aerosol measured by laser-induced breakdown
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10.1063/1.4803677
/content/aip/journal/jap/113/17/10.1063/1.4803677
http://aip.metastore.ingenta.com/content/aip/journal/jap/113/17/10.1063/1.4803677
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Schematic of experimental setup. Exit of the spray nozzle is set at z = 100 mm. Aerosol is ejected downward and spread out at an angle to vertical direction.

Image of FIG. 2.
FIG. 2.

The breakdown probabilities of the probe laser and the number density of droplets as a function of the delay time between the pump laser and probe laser. The pump and probe lasers are focused on the same point at the coordinate origin with an interval given by the delay time. The intensities of the pump and probe lasers are 9.2 × 10 and 1.1 × 10 [W/cm] for (a) and 1.5 × 10 and 2.2 × 10 [W/cm] for (b), respectively. The aerosol is ejected at a water flow rate of 10 ml/min and an air pressure of 0.4 MPa at the nozzle for (a), and at a water flow rate of 20 ml/min and an air pressure of 0.1 MPa at the nozzle for (b).

Image of FIG. 3.
FIG. 3.

The breakdown probabilities of the probe laser as a function of the delay time for different vertical positions of the breakdown caused by the pump laser. The pump laser is focused at z = 4.0, 3.0, 2.0, 1.0, 0, −0.5, and −1.0 mm for (a), (b), (c), (d), (e), (f), and (g), respectively. Fig. 3(e) is the same result as shown in Fig. 2(a) . The other experimental parameters are thesame as those in Fig. 2(a) . Scales for white legend symbols in (a), (c), (e), and (g) are left hand side and for black ones in (b), (d), and (f) are right hand side, respectively.

Image of FIG. 4.
FIG. 4.

The breakdown probabilities of the probe laser as a function of delay time for different horizontal positions of the breakdown caused by the pump laser. The pump laser is focused at x = 2.0, 1.0, and 0 mm for (a), (b), and (c), respectively. Fig. 4(c) is the same result as shown in Fig. 2(a) . The other experimental parameters are the same as those in Fig. 2(a) .

Image of FIG. 5.
FIG. 5.

The pump laser focus positions, where its breakdown affects the other breakdown at coordinate origin, are shown as black circles. Other positions, where its breakdown does not affect, are shown as white circles. These points were obtained from the experimental results shown in Figs. 2 4 .

Image of FIG. 6.
FIG. 6.

Relationship between the pump laser focus position and the delay time corresponding to the initial decrease in breakdown probability , the minimum breakdown probability , and the full recovery of the breakdown probability t as shown in reference diagram, where Pb is the breakdown probability. The solid line is the fitting line for . The dashed lines have the same gradient as the solid line, enabling a comparison of the relationships between the distance between the position of the pump laser and the delay times and .

Image of FIG. 7.
FIG. 7.

Distances of plume expansion as a function of expansion time, shown as black points for z-axis and with point for x-axis with experimental errors. These points were obtained from the results shown in Figs. 3 and 4 . The expansion distances take into consideration the aerosol flow velocity and the direction as a vector summation. The dashed line is a best-fitting curve obtained using a drag force model.

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/content/aip/journal/jap/113/17/10.1063/1.4803677
2013-05-07
2014-04-16
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Temporal and spatial effects of ablation plume on number density distribution of droplets in an aerosol measured by laser-induced breakdown
http://aip.metastore.ingenta.com/content/aip/journal/jap/113/17/10.1063/1.4803677
10.1063/1.4803677
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