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Воробьев, В. С.; Eronin, A. A.; Malyshenko, S. P.

doi:10.1023/a:1004182800475

Cited by 4 publications

(7 citation statements)

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“…In connection with the search for new bose-condense systems, attention was again attracted recently to the possible superfluidity in molecular hydrogen H 2 [1,2], discussed earlier in [3][4][5]. The very possibility crucially depends on the expected value of the critical temperature T λ , since normally molecular hydrogen crystallizes at ∼ 14 K and some measures should be taken to keep it in liquid phase at lower temperatures, which may appear harder to achieve if T λ is too low.…”

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confidence: 99%

Critical temperature of the superfluid transition in Bose liquids

Apenko

1999

Phys. Rev. B

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A phenomenological criterion for the superfluid transition is proposed, which is similar to the Lindemann criterion for the crystal melting. Then we derive a new formula for the critical temperature, relating T λ to the mean kinetic energy per particle above the transition. The suppression of the critical temperature in a sufficiently dense liquid is described as a result of the quantum decoherence phenomenon. The theory can account for the observed dependence of T λ on density in liquid helium and results in an estimate T λ ∼ 1.1 K for molecular hydrogen.

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confidence: 99%

Critical temperature of the superfluid transition in Bose liquids

Apenko

1999

Phys. Rev. B

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“…* corresponding author; e-mail: igor.timoshkin@eee.strath.ac.uk However, the application of the external electric field to the liquid changes this situation. As has been shown in [3,4], the external electric field promotes the formation of the bubbles through the change in the thermodynamical properties of the liquid and its phase equilibrium conditions. The electrostrictional tensile stress exerted on the liquid in the external field results in the "rupture" of the liquid and the formation of gas cavities.…”

Section: Introductionmentioning

confidence: 79%

“…Hence, the electrode's tip is the most probable area in the liquid where a bubble can be formed. The work A c (E) required to form the bubble with the critical size R c (E), may be written as [3,4,6,7]:…”

Section: Analytical Analysis Of the Critical Parameters Of The Bubblesmentioning

confidence: 99%

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Critical Parameters of Gas Cavities in Dielectric Liquids Stressed with High Electric Fields

et al. 2009

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Electric field stimulates formation of gas-filled cavities on sharp electrodes in insulating liquids which may initiate the dielectric breakdown of these liquids. Using an analytical model based on electrical and thermodynamic properties of fluids, the critical dimensions of gas-filled bubbles in ester fluid and transformer oils stressed with an impulse electric field were calculated. The results obtained in this paper could be important for the optimisation of the application of these liquids in high voltage and pulsed power systems.

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“…State and relevance of the problem. Electric explosion (EE) of metal conductors with cross-section S 0 and length l 0 in vacuum, gas and liquid media under the action of high pulse current (HPC) flowing through them of various amplitude-temporal parameters (ATP) has found quite wide practical application both in scientific (for example, in the study of the mechanisms of phase transitions of matter [1][2][3][4][5], the phenomena of mass, momentum and energy transfer in extreme conditions, including in the critical modes of nuclear explosions [6,7], the production of soft X-ray radiation for controlled thermonuclear fusion [8], research of the processes of optical pumping of gas lasers and active media for quantum generators based on metal vapors [9], etc. ), as well as technological ones (for example, when sputtering thin coatings for microelectronics [10,11], obtaining highly dispersed conductive powders [12][13][14][15][16], creation fast-acting electric explosive circuit breakers for high-current circuits of high-voltage generators with powerful capacitors and inductive energy storage [17], production of dense high-temperature plasma [18], highspeed power processing and deformation by shock loads of various materials (parts) [19,20], conducting certification tests of aviation and rocket-space equipment for electromagnetic compatibility and resistance to effects of lightning (first of all, in electrical circuits for introducing current and electromagnetic energy into objects under test) [21,22], etc.)…”

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confidence: 99%

A calculation of basic thermophysical, gasodynamic and electropower parameters of electric explosion is in the gas environment of metallic explorer

Баранов

Buriakovskyi

Князєв

2023

Electrical Engineering & Electromechanics

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Goal. Receipt and analysis of close analytical correlations for the engineering calculation of maximal temperature of Tm and pressures of Pm in a plasma channel, time of tex explosion of explorer, active resistance of Rc and specific conductivity of γp of plasma channel, to entered in explorer Wi and selected in the channel of Wc of thermal energy and high speed of vmw distribution of shock acoustic wave in the plasma products of electric explosion (EE) in gas of explorer under the action of large impulsive current (LIC). Methodology. Basis of thermophysics, thermodynamics, theoretical and applied electrical engineering, electrophysics bases of technique of high-voltage and large impulsive currents, basis of heavy-current electronics, theory of explosion and plasma, measuring technique and electromagnetic compatibility. Results . Close formulas are got for the analytical calculation of temperature of Tm and pressures of Pm in a plasma channel, time of tex explosion of explorer, active resistance of Rc and specific conductivity of γp of plasma channel, to entered in explorer Wi and selected in the channel of Wc of thermal energy and speed of vmw of shock acoustic wave in «metallic plasma» at EE in gas of explorer, testing action LIC in the discharge chain of high-voltage generator of impulsive currents (GIC) with the stocked energy of W0. It is rotined that at EE in atmospheric air of copper explorer long 110 mm and by a radius 0,1 mm in the bit chain of GIC of the microsecond temporal range (Imc≈−190 кА; tmc≈42 μs; ωc≈26,18·103 s-1; W0≈121,4 кJ) levels of temperature of Tm, to time of tex explosion, pressures of Pm and speeds of vmw in the area of his explosion can arrive at numeral values: Tm≈121,6·103 K, tex≈3,32 μs; Pm≈14,19·109 Pa and vmw≈4693 m/s. The ways of receipt are formulated in the bit chain of GIC of «record» (most) values of temperature of Tm, pressures of Pm and speeds of vmw. It is set that at EE in atmospheric air of the indicated short thin copper explorer the coefficient of the useful use of ηc of electric energy of W0 of condenser battery of GIC arrives at the numeral value of ηc≈(Wi+Wc)/W0≈0,326 (32,6 %). Arising up in the plasma channel of discharge, initiated EE in gas of explorer, temperature of Tm and pressure of Pm, time of tex explosion of explorer, specific conductivity of γp of channel, thermal energy of Wc and speed of vmw of shock acoustic wave selected in a channel in «metallic plasma» can be certain experimental a way on results decoding of oscillograms of discharge current of ic(t) and high-voltage of uc(t) on an explorer in the chain of GIC. A formula is resulted for the close calculation of critical integral of current of Jk at EE in gas of explorers from different metals. Executed on powerful GIC heavy-current experiments were confirmed by substantive provisions offered approach near the analytical calculation of basic parameters of electro-explosive process for the probed explorer. Originality. Offered and the engineering going is scientifically grounded near the analytical calculation of the indicated thermophysical, gasodynamic and electroenergy parameters of Tm, Pm, tex, Rc, γp, Wi, Wc and vmw at EE in gas of metallic explorer, plugged in the discharge chain of GIC. Practical value. Application in electrophysics practice of the offered engineering going near a calculation in the chain of GIC of basic parameters of electro-explosive process will allow to facilitate labour of workers of scientific laboratories and promote efficiency of work of technicians-and-engineers during practical realization by them different electro-explosive technologies.

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Cited by 4 publications

References 1 publication

Critical temperature of the superfluid transition in Bose liquids

Critical temperature of the superfluid transition in Bose liquids

Critical Parameters of Gas Cavities in Dielectric Liquids Stressed with High Electric Fields

A calculation of basic thermophysical, gasodynamic and electropower parameters of electric explosion is in the gas environment of metallic explorer

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