scholarly journals The effect of a micro bubble dispersed gas phase on hydrogen isotope transport in liquid metals under nuclear irradiation

2013 ◽  
Vol 88 (12) ◽  
pp. 3205-3214 ◽  
Author(s):  
J. Fradera ◽  
S. Cuesta-López
Keyword(s):  
Gas Phase ◽  
Hydrogen Isotope ◽  
Liquid Metals ◽  
Micro Bubble

scholarly journals Experimental studies of two-phase liquid metal-gas chain flow with ultrasonic echo pulse method and in the magnetic field of permanent magnets

2018 ◽  
Vol 240 ◽  
pp. 03003
Author(s):  
Artur Andruszkiewicz ◽  
Kerstin Eckert
Keyword(s):  
Magnetic Field ◽  
Gas Phase ◽  
Gas Flow ◽  
Permanent Magnets ◽  
Liquid Metals ◽  
Experimental Studies ◽  
Pulse Method ◽  
Phase Flow ◽  
Ultrasonic Echo ◽  
Echo Pulse

Metallurgical processes of refining and degassing liquid metals are related to the blowing-in neutral gasses like for example argon. Effectiveness of the process depends on the flowing gas parameters like: dimensions, velocity, distribution amd gas phase flow zone. These parameters can be changed under the influence of outside magnetic field and formed by it a Lorentz’ force. In order to get full information of rising bubbles essential are certain measuring methods. Among many of these the ultrasonic echo pulse method is likely to be the most intensive developed in the past few years. That method enables estimation of gas phase flow parameters in a range from individual bubble flow up to full continuous gas flow at the inlet nozzle. In this paper a measurement principle has been described for an ultrasonic echo method and there also submitted and discussed results of obtained results for diphase flow of GaInSn-argon.

Secondary hydrogen isotope effect in a gas-phase equilibrium

Tetrahedron ◽  
1959 ◽  
Vol 5 (2-3) ◽  
pp. 116-117 ◽  
Author(s):  
Peter Love ◽  
Robert W. Taft ◽  
Thomas Wartik
Keyword(s):  
Phase Equilibrium ◽  
Gas Phase ◽  
Isotope Effect ◽  
Hydrogen Isotope ◽  
Hydrogen Isotope Effect

scholarly journals MODELLING OF THE BREAK UP MECHANISM IN GAS ATOMIZATION OF LIQUID METALS

2020 ◽  
Author(s):  
Georgios S.E. Antipas
Keyword(s):  
Gas Phase ◽  
Liquid Metals ◽  
Wave Crest ◽  
Empirical Correlations ◽  
Shape Model ◽  
Liquid Body ◽  
Model Predictions ◽  
Break Up ◽  
Size Distribution Of Particles ◽  
Time Future

An integrated model of the atomization of a liquid column perturbed by a flowing gas phase is proposed. The algorithm termed Surface Wave Formation (SWF) is based on the concept of the formation of sinusoidal waves travelling along the surface of the liquid. The amplitude of such instabilities can grow exponentially under specific conditions, effectively causing the detachment of liquid particles either by shearing of part of a wave crest or by detachment of a liquid body at negative amplitude nodes. The SWF model covers both primary and secondary atomization and can in principle describe the break up of any well defined liquid shape. Model predictions compare favourably with experimental data from close coupled atomization of metals. The implications of the SWF algorithm are important, since - unlike empirical correlations - it can predict the size distribution of particles inside a spray in space and atomization time. Future integration could include calculations of cooling histories of drops in flight.

scholarly journals Small Crown-Ether Complexes as Molecular Models for Dihydrogen Adsorption in Undercoordinated Extraframework Cations in Zeolites

2020 ◽  
Author(s):  
Toshiki Wulf ◽  
Thomas Heine
Keyword(s):  
Gas Phase ◽  
Crown Ethers ◽  
Hydrogen Isotope ◽  
Rational Design ◽  
Isotope Separation ◽  
Adsorbed Molecule ◽  
Molecular Models ◽  
Crown Ether Complexes ◽  
Adsorption Energies ◽  
Extraframework Cations

1:1 metal complexes of small crown-ethers are structurally similar to extraframework sites in metal-exchanged zeolites. Using <i>ab initio</i> calculations, we show that adsorbed molecular hydrogen follows the same trends in adsorption energies and vibrational frequencies at both types of metal sites. Unlike zeolites, crown-ethers can be characterized in the gas phase, which opens new possibilities for understanding the bonding of dihydrogen at undercoordinated metal sites to help guide the rational design of porous materials for hydrogen isotope separation. Because more strongly binding adsorbates affect the geometry of the hosts, the similarity of crown-ethers and zeolites with regard to the vibrational spectra of the adsorbed molecule seems to be limited to H₂.

Mercury Scaling of a Swirling Jet Micro-Bubble Generator

2010 ◽  
Author(s):  
Stuart Walker ◽  
Arthur Ruggles
Keyword(s):  
High Speed ◽  
Liquid Metals ◽  
Model Development ◽  
Empirical Models ◽  
Swirling Jets ◽  
Micro Bubble ◽  
Break Up ◽  
Physical Phenomena ◽  
Small Bubbles ◽  
Bubble Production

Swirling jets with co-axial gas filament flow have been used for production of small bubbles in environmental and chemical processing industries for some time. The modeling of the physics for the gas filament break-up is not well established, and this impedes scaling of the device to use with fluids other than water and organics where data is available. High speed photographic studies of the gas filament break-up are used to examine the physical phenomena, and support model development for the bubble production that may be used to scale the device to alternate applications, such as bubble production in liquid metals. Bubble break-up models based on energy dissipation generate a power-law, with exponent of α = 8/5, relating Weber number to Reynolds number at the nozzle exit. Those models are compared to empirical models found in the literature providing a link between mechanistic models, scaling arguments, and legacy empirical models.

Hydrogen isotope fractionation between methanol and diphenylphosphine or dimethylphosphine in the gas phase and in aprotic solvents

1996 ◽  
Vol 74 (8) ◽  
pp. 1465-1469
Author(s):  
Andrzej Wawer ◽  
Jerzy Szydtlowski
Keyword(s):  
Interaction Energy ◽  
Gas Phase ◽  
Hydrogen Isotope ◽  
Isotope Fractionation ◽  
Isotope Effects ◽  
Solvent Polarity ◽  
Exchange Reactions ◽  
Fractionation Factor ◽  
The Given ◽  
Fractionation Factors

D/H fractionation factors between MeOH and Ph2PH in dilute solutions of tetrachloroethylene, benzene, tetrahydrofuran, pyridine, and acetonitrile and T/H fractionation factors between MeOH and Me2PH vapors were measured. The experimental results agree very well with values calculated from the statistical theory of isotope effects formulated by Bigeleisen and Mayer. There are correlations between observed fractionation factors and solvent polarity, and the interaction energy of methanol with the given solvent. Another correlation has been found between enthalpy of the exchange reactions and the interaction energy between methanol and the given solvent. Key words: isotope effects, fractionation factor, diphenylphosphine, methanol.

Sign in / Sign up

Export Citation Format

Share Document