scholarly journals ON THE SPEED OF SOUND IN STEAM

2015 ◽  
Vol 55 (6) ◽  
pp. 422
Author(s):  
Pavel Šafarík ◽  
Adam Nový ◽  
David Jícha ◽  
Miroslav Hajšman
Keyword(s):  
Numerical Model ◽  
Shock Waves ◽  
Speed Of Sound ◽  
Pure Water ◽  
Wet Steam ◽  
Two Phase ◽  
Metastable Region ◽  
State Of Water ◽  
Phase Medium ◽  
Water Substance

A study of the speed of sound in a pure water substance is presented here. The IAPWS data on the state of water and steam are applied only for investigating the speed of sound for a one-phase medium. A special numerical model for investigating the parameters of shock waves in steam is presented here and is applied for investigating extremely weak waves to obtain velocities representing the speed of sound in both one-phase and two-phase steam. Problems with the speed of sound in two-phase steam are discussed, and three types of speed of sound are derived for the metastable region of wet steam.

Amplification of tkiangular shock waves in a flammable two-phase medium

1974 ◽  
Vol 13 (1) ◽  
pp. 106-109
Author(s):  
B. E. Gel'fand ◽  
S. A. Gubin ◽  
S. M. Kogarko
Keyword(s):  
Shock Waves ◽  
Two Phase ◽  
Phase Medium

Effect of thermal relaxation of attenuation of shock waves in two-phase medium

1982 ◽  
Vol 18 (12) ◽  
pp. 1126-1133 ◽  
Author(s):  
V. A. Vakhnenko ◽  
V. M. Kudinov ◽  
B. I. Palmarchuk
Keyword(s):  
Shock Waves ◽  
Thermal Relaxation ◽  
Two Phase ◽  
Phase Medium

INFLUENCE OF EXTERNAL PARTICLES ON HETEROGENEOUS CONDENSATION FLOW IN CASCADES

2017 ◽  
Vol 41 (2) ◽  
pp. 265-280 ◽  
Author(s):  
Xu Han ◽  
Zhonghe Han ◽  
Peng Li
Keyword(s):  
Shear Stress ◽  
Numerical Model ◽  
Significant Influence ◽  
Nucleation Rate ◽  
Wet Steam ◽  
Flow Conditions ◽  
Two Phase ◽  
Heterogeneous Condensation ◽  
Particle Parameters ◽  
Condensation Flow

The wet steam nucleation zone is usually concentrated in the lower part of the throat. A double fluid numerical model and a shear stress transport (SST) k-ω-kd two-phase turbulence model were derived for the heterogeneous condensation flow of wet steam. The effect of the particle parameters on the condensation flow and the varying patterns of the nucleation rate and degree of super-cooling were investigated. The results show that external particles have a significant influence on the condensation flow, which weakens the condensation wave, restrains the development of thermodynamic imbalance and improves the flow conditions in the cascade.

SYNTHESIS OF HYDROGEN IN ACOUSTOPLASMA DISCHARGE IN A LIQUID-PHASE STREAM

2019 ◽  
pp. 42-48 ◽  
Author(s):  
N. A. Bulychev
Keyword(s):  
Liquid Phase ◽  
Organic Compounds ◽  
Electrode Materials ◽  
Solid Phase ◽  
Plasma Discharge ◽  
Raw Material ◽  
Two Phase ◽  
Reduced Pressure ◽  
External Power Source ◽  
Phase Medium

In this paper, the plasma discharge in a high-pressure fluid stream in order to produce gaseous hydrogen was studied. Methods and equipment have been developed for the excitation of a plasma discharge in a stream of liquid medium. The fluid flow under excessive pressure is directed to a hydrodynamic emitter located at the reactor inlet where a supersonic two-phase vapor-liquid flow under reduced pressure is formed in the liquid due to the pressure drop and decrease in the flow enthalpy. Electrodes are located in the reactor where an electric field is created using an external power source (the strength of the field exceeds the breakdown threshold of this two-phase medium) leading to theinitiation of a low-temperature glow quasi-stationary plasma discharge.A theoretical estimation of the parameters of this type of discharge has been carried out. It is shown that the lowtemperature plasma initiated under the flow conditions of a liquid-phase medium in the discharge gap between the electrodes can effectively decompose the hydrogen-containing molecules of organic compounds in a liquid with the formation of gaseous products where the content of hydrogen is more than 90%. In the process simulation, theoretical calculations of the voltage and discharge current were also made which are in good agreement with the experimental data. The reaction unit used in the experiments was of a volume of 50 ml and reaction capacity appeared to be about 1.5 liters of hydrogen per minute when using a mixture of oxygen-containing organic compounds as a raw material. During their decomposition in plasma, solid-phase products are also formed in insignificant amounts: carbon nanoparticles and oxide nanoparticles of discharge electrode materials.

Features of spatial shock-wave flows in vapor-gas-liquid mixtures

2014 ◽  
Vol 10 ◽  
pp. 27-31
Author(s):  
R.Kh. Bolotnova ◽  
U.O. Agisheva ◽  
V.A. Buzina
Keyword(s):  
Shock Wave ◽  
High Pressure ◽  
Shock Waves ◽  
Liquid Mixture ◽  
Liquid Mixtures ◽  
Pressure Vessels ◽  
Water Mixture ◽  
Two Dimensional ◽  
Nonstationary Processes ◽  
Two Phase

The two-phase model of vapor-gas-liquid medium in axisymmetric two-dimensional formulation, taking into account vaporization is constructed. The nonstationary processes of boiling vapor-water mixture outflow from high-pressure vessels as a result of depressurization are studied. The problems of shock waves action on filled by gas-liquid mixture volumes are solved.

Investigation of two-dimensional nonstationary processes of outflow a gas-saturated liquid from axisymmetric vessels

2012 ◽  
Vol 9 (1) ◽  
pp. 47-52
Author(s):  
R.Kh. Bolotnova ◽  
V.A. Buzina
Keyword(s):  
Comparative Analysis ◽  
Numerical Model ◽  
Liquid Mixture ◽  
Phase Model ◽  
Test Problems ◽  
Two Dimensional ◽  
Nonstationary Processes ◽  
Saturated Liquid ◽  
Two Phase ◽  
One Dimensional

The two-dimensional and two-phase model of the gas-liquid mixture is constructed. The validity of numerical model realization is justified by using a comparative analysis of test problems solution with one-dimensional calculations. The regularities of gas-saturated liquid outflow from axisymmetric vessels for different geometries are established.

Some 1-substitution derivatives of 4-aryl-2,3-dihalogeno-1-naphthols

1984 ◽  
Vol 49 (1) ◽  
pp. 110-121 ◽  
Author(s):  
Jiří Křepelka ◽  
Drahuše Vlčková ◽  
Milan Mělka
Keyword(s):  
Thionyl Chloride ◽  
Oxirane Ring ◽  
Secondary Amines ◽  
Two Phase ◽  
Lytic Effect ◽  
Primary And Secondary Amines ◽  
Phase Medium ◽  
Chloro Derivatives ◽  
Derivatives Of

Alkylation of derivatives of 4-aryl-1-naphthols (I-V) by 2,3-epoxypropyl chloride in methanolic sodium hydroxide gave epoxy derivatives VI, VIII, IX, XI and XII, apart from products of cleavage of the oxirane ring, VII and X. Analogous alkylation of compounds I, IV and V by 2-(N,N-diethylamino)ethyl chloride hydrochloride in a two-phase medium afforded basic ethers XIII to XV. The cleavage of the oxirane ring in compound VI by the action of primary and secondary amines, piperidine and substituted piperazines led to compounds XVI-XXIV. Reaction of thionyl chloride with compounds XXI, XXII and XXIV gave chloro derivatives XXV-XXVII.Exposure of compound XXII to 4-methylbenzenesulfonyl chloride produced compound XXVIII, retaining the secondary alcoholic group. In an antineoplastic screening in vivo none of the compounds prepared had an appreciable activity. Compound XVII, being an analogue of propranolol, was used in the test of isoproterenolic tachycardia, and showed a beta-lytic effect comparable with that of propranol.

scholarly journals Thermocapillary effects in two-phase medium and applications to metal-silicate separation

2021 ◽  
pp. 106640
Author(s):  
Yanick Ricard ◽  
Stéphane Labrosse ◽  
Hidenori Terasaki ◽  
David Bercovici
Keyword(s):  
Two Phase ◽  
Metal Silicate ◽  
Phase Medium
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