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6 results on '"J. Bdzil"'

1. Interactions of Inert Confiners with Explosives.

Author

G. Sharpe and J. Bdzil

Abstract

The deformation of an inert confiner by a steady detonation wave in an adjacent explosive is investigated for cases where the confiner is sufficiently strong (or the explosive sufficiently weak) such that the overall change in the sound speed of the inert is small. A coupling condition which relates the pressure to the deflection angle along the explosive-inert interface is determined. This includes its dependence on the thickness of the inert, for cases where the initial sound speed of the inert is less than or greater than the detonation speed in the explosive (supersonic and subsonic inert flows, respectively). The deformation of the inert is then solved by prescribing the pressure along the interface. In the supersonic case, the detonation drives a shock into the inert, subsequent to which the flow in the inert consists of alternating regions of compression and tension. In this case reverberations or ‘ringing’ occurs along both the deflected interface and outer edge of the inert. For the subsonic case, the flow in the interior of the inert is smooth and shockless. The detonation in the explosive initially deflects the smooth interface towards the explosive. For sufficiently thick inerts in such cases, it appears that the deflection of the confiner would either drive the detonation speed in the explosive up to the sound speed of the inert or drive a precursor wave ahead of the detonation in the explosive. Transonic cases, where the inert sound speed is close to the detonation speed, are also considered. It is shown that the confinement affect of the inert on the detonation is enhanced as sonic conditions are approached from either side. [ABSTRACT FROM AUTHOR]

Published
2006
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3. Chemical Instabilities. II. Chemical Surface Reactions and Hydrodynamic Instability

Author

J. Bdzil and H. L. Frisch

Subjects
Convection, Physics, Surface (mathematics), Classical mechanics, Variational principle, General Engineering, Mechanics, Surface reaction, Instability, Isothermal process, Eigenvalues and eigenvectors, Catalysis
Abstract

A linear stability analysis of the hydrodynamics of the isothermal two‐component reactive fluid (A2, A), confined between two infinite parallel plates, and involved in the surface catalyzed reaction (A2⇋2A) is performed. The existence of solutions to the eigenvalue problem governing the state of marginal instability corresponding to pure convection is established. A variational principle for the critical eigenvalue for instability is developed and used to show that the surface catalyzed reaction enhances the instability that would occur if the reaction were frozen.

Published
1971
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4. Chemical Instabilities. IV. Nonisothermal Chemical Surface Reactions and Hydrodynamic Instability

Author

H. L. Frisch and J. Bdzil

Subjects
Physics, Salt solution, Standard enthalpy of reaction, Convective instability, General Engineering, Evaporation, Thermodynamics, Surface reaction, Instability, Isothermal process, Catalysis
Abstract

A linear stability analysis of a horizontal layer of the reactive fluid mixture (A2A) which is undergoing the surface catalyzed nonisothermal reaction (A2⇋2A) is performed. It has been found that including the heat of reaction in our analysis leads not only to a modification of the convective instability observed for the isothermal reactive fluid, but also to a whole new class of instabilities for fluids with negative (gravitationally stable) steady‐state density gradients. This new class of instabilities resulting from the heat of reaction is referred to as “thermochemical” instabilities. The mathematically similar thermosaline evaporation problem, describing the evaporation of water from the surface of a salt solution, is also examined and found to exhibit similar stability characteristics.

Published
1971
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5. Chemical Instabilities. V. Hydrodynamic Stability of a Simple Dissociating Fluid in Plane Couette Flow

Author

H. L. Frisch and J. Bdzil

Subjects
Physics::Fluid Dynamics, Physics, In plane, Hydrodynamic stability, Transverse plane, Shear (geology), Taylor–Couette flow, General Engineering, Thermodynamics, Mechanics, Couette flow, Instability, Dissociation (chemistry)
Abstract

A linear stability analysis was performed of a horizontal layer of the reactive fluid mixture (A2, A) which is undergoing both a simple surface catalyzed dissociation and plane Couette flow. When only transverse disturbances were considered, it was found that the instabilities for this system are similar to those discussed previously. By including the longitudinal disturbances, it was found that the shear has a stabilizing influence on the overstable S>0 instability.

Published
1971
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6. Chemical Instabilities. VI. Hydrodynamic Stability of the Dissociating Fluid A[sub 2]⇋2A

Author

J. Bdzil and H. L. Frisch

Subjects
Physics, Hydrodynamic stability, General Engineering, Thermodynamics, Surface reaction, Stability (probability)
Abstract

The stability characteristics of the dissociating fluid A2⇋2A experiencing bulk reactions are re‐examined. The results of this analysis show qualitative agreement with those obtained for the case of chemical surface reactions.

Published
1971
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