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2021 | Book

Modeling Explosions and Blast Waves

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About this book

The book provides a concise description of the physical processes and mathematical models for explosions and formation of blast waves from explosions. The contents focus on quantitatively determining the energy released in the different types of explosions and the destructive blast waves that are generated. The contribution of flames, detonations and other physical processes to the explosion phenomenon is dealt with in detail. Gaseous and condensed phase explosions are discussed and the yield of explosions with their TNT equivalence is determined. Time scales involved in the explosion process and the scaling procedure are ascertained.

Explosions over the ground, in water, and the interaction of explosions with objects are examined. In order to keep the text easily readable, the detailed derivation of the mathematical equations is given in the seven appendices at the end of the book. Case studies of various explosions are investigated and simple problems and their solutions are provided for the different topics to assist the reader in internalizing the explosion process. The book is a useful reference for professionals and academics in aeronautics, mechanical, civil and chemical engineering and for personnel working in explosive manufacture and high-energy materials, armaments, space, defense, and industrial and fire safety.

Table of Contents

Frontmatter
Chapter 1. Basic Concepts and Introduction to Blast Waves and Explosions
Abstract
The word ‘explosion’ is generally used to describe events associated with a loud noise and sudden disruption of the objects at the site of its occurrence and around it.
K. Ramamurthi
Chapter 2. Blast Waves in Air
Abstract
The blast wave, generated by a rapid release of energy, disperses and dissipates the energy into the surrounding medium.
K. Ramamurthi
Chapter 3. Interaction of Blast Waves with Rigid and Non-rigid Bodies
Abstract
Blast waves, formed from explosive energy release, would interact with bodies placed in their path of propagation.
K. Ramamurthi
Chapter 4. Energy Release and Rate of Energy Release
Abstract
Gaseous, liquid, and solid substances containing elements such as carbon and hydrogen can chemically react with oxygen in the air and release energy.
K. Ramamurthi
Chapter 5. Thermal Theory of Explosions
Abstract
The rate of energy release from the chemical reaction of a given mass or volume of an explosive was seen to increase as its temperature increases.
K. Ramamurthi
Chapter 6. Propagation of Reaction Front: Detonation, Deflagration and Quasi-Detonation
Abstract
When the temperature of a reactive medium is increased, chemical reactions take place in it and energy is released.
K. Ramamurthi
Chapter 7. Formation of Flames and Detonations in Gaseous Explosives
Abstract
In Chap. 5, the conditions for thermal explosion of a reactive substance were determined based on the heat generated and the heat loss from it. Terms like auto-ignition and ignition temperatures were derived using a lumped mass assumption. It is rarely possible for the entire bulk of the substance to get ignited; rather, a flame or a detonation, as described in the last chapter, would get initiated from an ignition or initiation source and it would thereafter propagate. We consider the formation of flames and detonations and the conditions of the gaseous explosive for which the formation and propagation is possible in this chapter.
K. Ramamurthi
Chapter 8. Condensed Phase Explosions
Abstract
Condensed phase explosives contain the fuel and the oxidizer integrated together as a solid or a liquid. The fuel and oxidizer could be combined in the form of a chemical compound (i.e., fuel and oxidizer exist as a single molecule) or could be intimately mixed together as a heterogeneous substance. In the latter, the fuel and oxidizer are mixed well to be qualified as a single substance.
K. Ramamurthi
Chapter 9. Unconfined and Confined Gas Phase Explosions
Abstract
Gaseous fuels and volatile liquid fuels are used for household and industrial purposes and for propulsion. They are transported by road, rail, and sea in tankers of different sizes.
K. Ramamurthi
Chapter 10. Dust Explosions
Abstract
Large quantities of agricultural dust are involved during the handling of foodgrains for bulk transport and storage. The grains are also ground to fine powder for making food products.
K. Ramamurthi
Chapter 11. Physical Explosions and Rupture of Pressure Vessels
Abstract
Chemical reactions are not to the only means of obtaining rapid release of energy for the occurrence of explosions.
K. Ramamurthi
Chapter 12. TNT Equivalence and Yield from Explosions
Abstract
The overpressure and impulse at a distance \(R_s\) from an explosion were determined in Chap. 2 by assuming the energy to be released instantaneously at a point. A length scale for the energy release called as ‘explosion length \(R_0\)’ was defined, and a non-dimensional parameter \(R_s/R_0\) was used to find the values of overpressure and impulse following Sach’s scaling law. In practice, all sources of energy release would have a finite volume and the release of energy cannot be instantaneous.
K. Ramamurthi
Chapter 13. Atmospheric Dispersion of Flammable Gases and Pollutants
Abstract
Explosions involving gaseous fuels, vapors, dust, and condensed phase materials have been discussed in the earlier chapters. The release of fuel gas or vapor into the ambient from leaks in pipelines conveying gaseous fuel and volatile liquid fuels at high pressures and from spills of gaseous and liquid fuels from fuel storages vessels, oil rigs and refineries, and chemical process industries could form explosive gas clouds in the atmosphere.
K. Ramamurthi
Chapter 14. Quantification of Damages
Abstract
The principles governing explosion of gaseous, dust, and condensed phase substances are discussed in the previous chapters. Confined and unconfined explosions, physical explosions, and explosions of pressure vessels are modeled. Chapman–Jouguet detonations and quasi-detonations are seen to be more destructive than flames in a confined geometry.
K. Ramamurthi
Backmatter
Metadata
Title
Modeling Explosions and Blast Waves
Author
Dr. K. Ramamurthi
Copyright Year
2021
Electronic ISBN
978-3-030-74338-3
Print ISBN
978-3-030-74337-6
DOI
https://doi.org/10.1007/978-3-030-74338-3

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