Spray Detonation

Zhang, Fan

doi:10.1007/978-3-540-88447-7_1

Cited by 7 publications

(5 citation statements)

References 85 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Due to Hertz-Knudsen equation [13], the achieved vapour pressure is about 3 × 10 8 Pa when temperature is close to the critical. Abrupt grow of temperature and pressure causes creation of the detonation waves [37,38]. Next, propagating shocks cause compression Figure 6: SEM micrograph of deposited WB 3 film (magnification ×5000) with EDS measurement points (a) and the abundances of elements in the deposited film in the spot spectrum 3 (b) and table reporting the composition of the film in examined areas (c).…”

Section: Effect Of the Ablation Of Boron On The Deposition Of Wbmentioning

confidence: 99%

Differences in Nanosecond Laser Ablation and Deposition of Tungsten, Boron, and WB₂/B Composite due to Optical Properties

Mościcki

2016

International Journal of Optics

View full text Add to dashboard Cite

The first attempt to the deposition of WB3films using nanosecond Nd:YAG laser demonstrated that deposited coatings are superhard. However, they have very high roughness. The deposited films consisted mainly of droplets. Therefore, in the present work, the explanation of this phenomenon is conducted. The interaction of Nd:YAG nanosecond laser pulse with tungsten, boron, and WB2/B target during ablation is investigated. The studies show the fundamental differences in ablation of those materials. The ablation of tungsten is thermal and occurs due to only evaporation. In the same conditions, during ablation of boron, the phase explosion and/or fragmentation due to recoil pressure is observed. The deposited films have a significant contribution of big debris with irregular shape. In the case of WB2/B composite, ablation is significantly different. The ablation seems to be the detonation in the liquid phase. The deposition mechanism is related mainly to the mechanical transport of the target material in the form of droplets, while the gaseous phase plays marginal role. The main origin of differences is optical properties of studied materials. A method estimating phase explosion occurrence based on material data such as critical temperature, thermal diffusivity, and optical properties is shown. Moreover, the effect of laser wavelength on the ablation process and the quality of the deposited films is discussed.

show abstract

Section: Effect Of the Ablation Of Boron On The Deposition Of Wbmentioning

confidence: 99%

Differences in Nanosecond Laser Ablation and Deposition of Tungsten, Boron, and WB₂/B Composite due to Optical Properties

Mościcki

2016

International Journal of Optics

View full text Add to dashboard Cite

show abstract

“…15,16,30,71 The continuum assumption cannot robustly account for local differences in particle characteristics, particularly if the particles are polydispersed. In addition, the only boundary conditions that can be considered in a straightforward manner are slipping and sticking, whereas reflection boundary conditions, such as specular and diffuse reflection, may be additionally considered with a Lagrangian approach.…”

Section: Introductionmentioning

confidence: 99%

On Mesh-Particle Techniques

Löhner

Camelli

Baum³

et al. 2014

52nd Aerospace Sciences Meeting

View full text Add to dashboard Cite

The treatment of dilute solid (or liquid) phases via Lagrangian particles within meshbased gas-dynamics (or hydrodynamic) codes is common in computational fluid dynamics. While these techniques work very well for a large spectrum of physical parameters, in some cases, notably for very light or very heavy particles, numerical instabilities appear. The present paper examines ways of mitigating these instabilities, and summarizes important implementational issues.

show abstract

“…How fine the fragments should be for prompt energy release in the detonation products or air largely depended on materials involved in an SRM shell, and also on the charge diameter which must be beyond a critical diameter for prompt metal particle initiation and reaction (much larger than detonation failure diameter) [25][26][27][28]. Of the materials involved, the fineness of the fragments was determined by the reaction rate type whether it was diffusion-limited, surface kinetics-controlled, or in between when the fine fragments were explosively dispersed in a cloud [29,30]. For example, detonation of an Al particle suspension in air required particle sizes within a few micrometers, and rapid deflagration of an Al cloud in detonation products and air needed particle sizes within a few tens of micrometers [26,27,29,30].…”

Section: Introductionmentioning

confidence: 99%

“…Of the materials involved, the fineness of the fragments was determined by the reaction rate type whether it was diffusion-limited, surface kinetics-controlled, or in between when the fine fragments were explosively dispersed in a cloud [29,30]. For example, detonation of an Al particle suspension in air required particle sizes within a few micrometers, and rapid deflagration of an Al cloud in detonation products and air needed particle sizes within a few tens of micrometers [26,27,29,30].…”

Section: Introductionmentioning

confidence: 99%

Hetero‐blast from a structural reactive material cylinder under explosive loading

Zhang,

Yoshinaka,

Ripley

2024

Propellants Explo Pyrotec

View full text Add to dashboard Cite

A structural reactive material (SRM) cylinder is considered here as a limiting case of a dense metallic energetic system in which a mixture of metal particles is consolidated to the theoretical maximum density excluding porosity, to possess both high energy density and mechanical strength. Dynamic fragmentation and free‐field explosion of a 103 mm inner diameter SRM cylinder charge is experimentally studied, with a wall thickness varying in a range of metal‐to‐explosive mass ratio M/C=1.3 to 4.0. Under explosive loading, the SRM cylinder produces a designated fragment size distribution divided into two groups: fine fragments with sizes on the order of 102 μm and below, and coarse fragments with sizes on the order ranging between 100‐101 mm. Prompt detonation shock‐induced reaction (DSIR) of the expanding cloud of high‐concentration fine fragments supplements the energy to enhance the primary blast as it propagates, while the coarse fragments form a high‐speed, high‐concentration metal momentum flux crossing the fireball and blast front to contribute to the total impulse loading to a nearby structure. Rapid impact‐induced reaction (IIR) of the secondary fragments from high‐speed coarse SRM fragments further enhances the reflected blast loading or generates a high interior explosion pressure as fragments perforate into the structure. The above distinctive characteristics of a unique hetero‐blast are coupled effectively in the near‐field range.

show abstract

Spray Detonation

Cited by 7 publications

References 85 publications

Differences in Nanosecond Laser Ablation and Deposition of Tungsten, Boron, and WB₂/B Composite due to Optical Properties

Differences in Nanosecond Laser Ablation and Deposition of Tungsten, Boron, and WB₂/B Composite due to Optical Properties

On Mesh-Particle Techniques

Hetero‐blast from a structural reactive material cylinder under explosive loading

Contact Info

Product

Resources

About

Spray Detonation

Cited by 7 publications

References 85 publications

Differences in Nanosecond Laser Ablation and Deposition of Tungsten, Boron, and WB2/B Composite due to Optical Properties

Differences in Nanosecond Laser Ablation and Deposition of Tungsten, Boron, and WB2/B Composite due to Optical Properties

On Mesh-Particle Techniques

Hetero‐blast from a structural reactive material cylinder under explosive loading

Contact Info

Product

Resources

About

Differences in Nanosecond Laser Ablation and Deposition of Tungsten, Boron, and WB₂/B Composite due to Optical Properties

Differences in Nanosecond Laser Ablation and Deposition of Tungsten, Boron, and WB₂/B Composite due to Optical Properties