Showing papers on "Rarefaction published in 1977"
TL;DR: In this article, a one-dimensional model for thinning of the plasma sheet is developed on the basis of launching a fast mode MHD rarefaction wave propagating in the tailward direction along the surface.
75 citations
Journal Article•
TL;DR: In this paper, two-dimensional hydrodynamic calculations are presented for the case of Type II supernovae, showing that the instability results in the ejection of a clumpy shell.
Abstract: After a shock wave has accelerated the outer layers of a star during a stellar explosion, a rarefaction wave moves back into the stellar material, resulting in the conversion of internal energy into kinetic energy. This additional acceleration can be Rayleigh-Taylor unstable. Two-dimensional hydrodynamic calculations are presented for the case of Type II supernovae, showing that the instability results in the ejection of a clumpy shell. It is unlikely that radiation transport can dump the instability for normal Type II supernove. We further conjecture that the structure of nova shells is a consequence of t We fur ther conjecture that the structure of nova shells is a consequence of this instability; in this case, rings are formed by the smearing action of high rotational velocities
38 citations
TL;DR: In this paper, the behavior of duralumin and copper under conditions of specimen loading by two successive shock waves and during unloading after the shock compression was studied under the assumption that the amplitude of the first shock wave was 150-250 kbar.
Abstract: The behavior of duralumin and copper is studied under conditions of specimen loading by two successive shock waves and during unloading after the shock compression. The amplitude of the first shock wave was 150–250 kbar. Direct measurements were performed of the difference in main stresses behind the shock front in duralumin. The results obtained do not agree with existing concepts of the behavior of solids under dynamic loading. Possible causes of this divergence are considered.
21 citations
TL;DR: In this paper, the authors investigated the effects of the surface curvature, the normal stress other than pressure and the rarefaction on the above phenomenon as well as on the field distributions.
Abstract: Evaporation and condensation of a slightly rarefied vapor gas between concentric cylinders and spheres are investigated on the basis of the linearized BKW (or BGK) equation and the diffuse reflection boundary condition. The reverse temperature gradient, negative heat and mass flows exist as in the parallel two-surface problem. The effects of the surface curvature, the normal stress other than pressure and the rarefaction on the above phenomenon as well as on the field distributions are also investigated.
9 citations
TL;DR: In this paper, the boundary conditions relating the values of the hydrodynamic variables in a rarefaction wave to the surface temperature are derived and the gas-kinetic problem of the motion of vapor in a thin layer directly adjacent to a phase boundary is solved approximately.
Abstract: In this article the boundary conditions relating the values of the hydrodynamic variables in a rarefaction wave to the surface temperature are derived. The gas-kinetic problem of the motion of vapor in a thin layer directly adjacent to a phase boundary is solved approximately for this case. If the temperature of the surface is held constant by external radiation, the resulting solution makes it possible to compute the surface temperature, the velocity of the evaporation front, and the recoil momentum.
3 citations
TL;DR: In this article, the rarefaction wave following the production of a pressure transient was detected and stored digitally, and the shape of the pressure transient is found to be in good agreement with theory and justified application of Fourier transform techniques to obtain the frequency-dependent dynamic compressibility.
Abstract: A new technique is described whereby the dynamic compressibility of polymer solutions may be studied directly. The rarefaction wave following the production of a pressure transient was detected and stored digitally. The shape of the pressure transient was found to be in good agreement with theory and justified application of Fourier transform techniques to obtain the frequency-dependent dynamic compressibility. The limitations of the technique are discussed, with reference to studies performed on a series of solvents and on a solution of polyisobutylene in toluene.
1 citations