Explosion of a Water Droplet by Pulsed Laser Heating

Carls, Joseph C.; Brock, J. R.

doi:10.1080/02786828708959148

Cited by 27 publications

(9 citation statements)

References 15 publications

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“…The final temperatures reached by the heated portion of the drops based on direct laser heating are calculated to be between 315 K and 580 K. These high temperatures can also explain why some drops explode when irradiated by pulsed laser instead of being propelled. Temperatures as high as 2400 K have been reported by other researchers (Carls and Brock, 1987) who studied droplet explosion by pulsed lasers. This rise in temperature is small for transparent drops because most of their heating comes from the spark and not directly from the laser, and large for opaque drops which receive most of their heating directly from the laser.…”

Section: Model For Drop Motionmentioning

confidence: 78%

“…The effect of laser on opaque drops was also studied (Ivanov et al, 1977). In USA too, the explosion of water drops under laser was studied (Singh and Knight, 1978;(Carls and Brock, 1987), so was the process of droplet heating under a continuous laser beam (Park and Armstrong, 1989) and also the hydrodynamics of a drop when exposed to pulsed laser (Zardecki and Pendleton, 1989). (Autric et al, 1988) also reported their findings on the effects of pulsed CO 2 on water droplets.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Liquid Transparency on Laser-Induced Motion of Drops

Shukla

Sallam

2009

Journal of Fluids Engineering

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An experimental investigation of the role of liquid transparency in controlling laser-induced motion of liquid drops is carried out. The study was motivated by application to manipulation of liquid drops over a solid substrate. Droplets with diameters of 1–4 mm were propelled on a hydrophobic substrate using a pulsed-laser beam (532 nm, 10 Hz, 3–12 mJ/pulse) with a 0.9 mm diameter fired parallel to the substrate. The test liquid was distilled water whose transparency was varied by adding different concentrations of Rhodamine 6G dye. Motion of the drops was observed using a video camera. Measurements include direction of motion and the distance traveled before the drops come to rest. The present results show that the direction of the motion depends on the drop transparency; opaque drops moved away from the laser beam, whereas transparent drops moved at small angles toward the laser beam. The motion of both transparent and opaque drops was dominated by thermal Marangoni effect; the motion of opaque drops was due to direct heating by the laser beam, whereas in the case of transparent drops, the laser beam was focused near the rear face of the transparent drops to form a spark that pushed the drops in the opposite direction. Energies lower than 3 mJ were incapable of moving the drops, and energies higher than 12 mJ shattered the drops instead of moving them. A phenomenological model was developed for the drop motion to explain the physics behind the phenomenon.

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Section: Model For Drop Motionmentioning

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Effect of Liquid Transparency on Laser-Induced Motion of Drops

Shukla

Sallam

2009

Journal of Fluids Engineering

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“…To describe gas dynamic processes inside and outside a single droplet, the model consisting of conservative equations of mass, momentum, energy and species for a mixture of ideal multicomponent non-viscous and non-conducting components (Euler equations) is used. In the explosive vaporization regime, molecular transport effects such as diffusion and conduction are small compared to convective transport [31]. The plasma in vapor aureole is considered as an ideal gas.…”

Section: Propagation Of Shock Wavementioning

confidence: 99%

“…The explosive vaporization of a single droplet by high-power laser radiation is investigated in [31]. The optical size of the droplet is assumed to be in the Rayleigh limit (it absorbs energy uniformly).…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of optical breakdown in a liquid droplet induced by a laser pulse

2018

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Please cite this article as: P.V. Bulat, O.P. Minin, K.N. Volkov, Numerical simulation of optical breakdown in a liquid droplet induced by a laser pulse, Acta Astronautica (2017), AbstractModelling and simulation of interaction of laser pulse with individual liquid droplets are of crucial importance in terms of development and code coupling for simulation of laser propulsion and detonation in gas-droplet systems. These applications are challenging and complex for many reasons, one among them is the disparate time and length scales that are required to resolve for an accurate physical representation of the problem. The injection of liquid droplets with low evaporation temperature causes optical breakdown on the individual droplet and leads to a drop of the minimum pulse energy of detonation in the gas-droplet mixture. The mathematical models of various stages of the optical breakdown on individual droplet and numerical methodology for computer modelling of the laser-induced breakdown are developed. Sub-models of optical breakdown on liquid droplet include droplet heating to boiling temperature, its evaporation and formation of vapor aureole around the droplet, ionization of vapor aureole and development of electron avalanche, appearance of microplasma spots and their expansion, propagation of shock wave inside the droplet and in the surrounding gas. The threshold intensity of optical breakdown on individual water droplet and its dependence on droplet radius, location of droplet, total energy and radius of laser pulse are studied.

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“…The explosive vaporization of a single aerosol droplet by pulsed laser radiation is investigated by (Carls and Brock, 1987). The slow vaporization regime considered incorporated molecular transport effects but assumes a constant pressure field, thus eliminating convection.…”

Section: Introductionmentioning

confidence: 99%

Laser-Induced Breakdown and Detonation in Particle-Laden Systems

Волков¹

2015

American Journal of Applied Sciences

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Simulation of the interaction of a laser pulse with gas-droplet and gas-particle mixtures plays an important role in environmental and engineering applications. The injection of liquid droplets or metal particle causes optical breakdown on the individual droplet or particle and leads to a drop of the detonation minimum pulse energy of the mixture. Mathematical models of various stages of the optical breakdown are developed and applied to the analysis of laser-induced breakdown in particle-laden systems. The numerical calculations are based on an in-house computer code using the finite-volume method and high-resolution scheme. The threshold of optical breakdown and its dependence on contributing factors (droplet radius, location of droplet, total energy and time of laser pulse, radius of laser spot) has been studied. Minimum pulse energy of detonation was computed in the hydrogen-oxygen mixture with metal particles and liquid droplets.

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Explosion of a Water Droplet by Pulsed Laser Heating

Cited by 27 publications

References 15 publications

Effect of Liquid Transparency on Laser-Induced Motion of Drops

Effect of Liquid Transparency on Laser-Induced Motion of Drops

Numerical simulation of optical breakdown in a liquid droplet induced by a laser pulse

Laser-Induced Breakdown and Detonation in Particle-Laden Systems

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