Article

# On the Entropy Production Due to Explosion in Seawater

Entropy: International and Interdisciplinary Journal of Entropy and Information Studies 01/2005; DOI: 10.3390/e7020134

Source: DOAJ

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**ABSTRACT:**The calculation of the development of a spherical explosion in sea water, due to the symmetrical detonation of a charge of pentaerythritol tetranitrate, is carried up to the stage when the second blast wave converges as an implosive wave on the center and is reflected. Continuing earlier calculations by the authors, the complete field of disturbance is determined by the Eulerian approach, using the method of characteristics and boundary-fitting techniques, up to the characteristic ray originating from the center at the time of implosion. At this ray the main shock has traveled approximately 7 charge radii from the center. The implosive phase of the second shock motion is a well-known similarity phenomenon, and a variety of methods for treating this are discussed.Physics of Fluids - PHYS FLUIDS. 01/1962; 5:426-431. -
##### Article: Spherical piston problem in water

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**ABSTRACT:**In this paper, we study the propagation of a shock wave in water, produced by the expansion of a spherical piston with a finite initial radius. The piston path in the x, t plane is a hyperbola. We have considered the following two cases: (i) the piston accelerates from a zero initial velocity and attains a finite velocity asymptotically as t tends to infinity, and (ii) the piston decelerates, starting from a finite initial velocity. Since an analytic approach to this problem is extremely difficult, we have employed the artificial viscosity method of von Neumann & Richtmyer after examining its applicability in water. For the accelerating piston case, we have studied the effect of different initial radii of the piston, different initial curvatures of the piston path in the x, t plane and the different asymptotic speeds of the piston. The decelerating case exhibits the interesting phenomenon of the formation of a cavity in water when the deceleration of the piston is sufficiently high. We have also studied the motion of the cavity boundary up to 550 cycles.Journal of Fluid Mechanics 11/1969; 39(03):587 - 600. · 2.29 Impact Factor - Journal of Mathematical Analysis and Applications 03/1966; 13(3):565-576. · 1.05 Impact Factor

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