Reactive Recoil and Pressure Pulsations with 1/ f Power Spectrum under Conditions of Explosion Boiling of Jets of Superheated Liquid

The results are given of an experimental investigation of the reactive recoil of jets of boiling up liquids in a thermodynamically highly nonequilibrium mode of efflux. The experimental data are given in the dimensionless form using the thermodynamic similarity methods. The correlation is discussed between the abrupt decrease in the reactive power with a complete disintegration of the jet under conditions of explosion boiling. Local measurements are performed of pressure pulsations in a jet of superheated liquid with different mechanisms of vaporization. It is found that, under conditions of explosion boiling, the power spectrum of pulsations depends inversely proportionally on frequency (1/f or flicker noise). This form of power spectrum implies the possibility of strong low-frequency pulsations of reactive recoil of boiling up flows.     

1/f Fluctuations in Critical Modes of Flow of Superheated Liquid

Experimental studies are performed into the variation of the shape of a jet of boiling liquid flowing out of a high-pressure vessel under conditions of high superheating. The mechanisms of bulk heterogeneous and homogeneous nucleation are identified, and the correlation between these mechanisms and critical modes of outflow is determined. The photometry of transmitted laser radiation is used to investigate the dynamics of photocurrent fluctuations. It is found that, in the case of intensive bulk boiling in a jet of superheated liquid, the fluctuation power spectrum has a low-frequency component (flicker noise) diverging as 1/f. This effect is associated with nonequilibrium phase transitions proceeding in the system.     

Dynamical Chaos in a Nonlinear System with 1/f Spectrum

Technical Physics Letters - A system of two nonlinear differential equations proposed for explaining the physical nature of the 1/f spectra reveals the chaotization of trajectories under periodic...     

Quantitative Analysis of Domain Structure and Rapid Search for New Materials for Permanent Magnets

Metal Science and Heat Treatment - The possibilities of application of known models of domain structure to multiphase alloys are analyzed with the aim to assess the anisotropy constants and to...     

Formation of pure $$\tau$$ τ -phase in Mn–Al–C by fast annealing using spark plasma sintering

Journal of Materials Science - Mn–Al–C is intended to be one of the “gap magnets” with magnetic performance in-between ferrites and Nd-Fe-B. These magnets are based on the...     

The 1/<Emphasis Type="Italic">f</Emphasis> spectrum of acoustic cavitation

The fluctuations of a response signal during acoustic cavitation in water in an ultrasonic field were studied by photometry of the transmitted laser radiation. In a broad range of frequencies, the spectral density of photocurrent fluctuations exhibits the 1/f behavior and their amplitude distribution function has a bimodal character. Coarsening of the scale of the experimental time series makes the bimodal character more pronounced and reveals the scale invariance of fluctuations.     

Three-Dimensional X-Ray Tomography of Industrial Objects with Limited Sizes of the Recording Screen

Russian Journal of Nondestructive Testing - The possibilities of using a 3D tomograph with a size-limited recording screen for detecting randomly oriented crack-like defects in large industrial...     

The Entropy Maximum in Scale-Invariant Processes with 1/f α Power Spectrum: the Effect of White Noise Anisotropy

Technical Physics Letters - Extreme fluctuations are simulated by a system of nonlinear stochastic equations describing the interacting phase transitions. Random 1/f&nbsp;α processes are...     

Character of the shock loading under dynamic compaction of ultradispersed diamonds

The multistep shape of the pressure pulse in a device for dynamic compaction of ultradispersed diamonds was recorded experimentally. A smooth increase in pressure to a maximum shows the shock-free character of compression of porous carbon. Translated fromFizika Goreniya i Vzryva, Vol. 34, No. 3, pp. 105–106, May–June 1998.