Simulation of Solid Inert Gas Bubbles in Metals

2009 ◽  
pp. 364-364-13
Author(s):  
S Srinivasan ◽  
AK Tyagi ◽  
K Krishan
Keyword(s):  
Gas Bubbles ◽  
Inert Gas

Fission Gas Bubbles in Fractured UO2

1968 ◽  
Vol 26 ◽  
pp. 286-287
Author(s):  
O. M. Katz
Keyword(s):  
Electron Microscopy ◽  
Thermal Gradient ◽  
Gas Bubbles ◽  
Inert Gas ◽  
Thermal Gradients ◽  
Fission Gas ◽  
Beam Heating ◽  
Limited Application ◽  
Bubble Characteristics ◽  
Electron Beam Heating

The swelling of irradiated UO2 has been attributed to the migration and agglomeration of fission gas bubbles in a thermal gradient. High temperatures and thermal gradients obtained by electron beam heating simulate reactor behavior and lead to the postulation of swelling mechanisms. Although electron microscopy studies have been reported on UO2, two experimental procedures have limited application of the results: irradiation was achieved either with a stream of inert gas ions without fission or at depletions less than 2 x 1020 fissions/cm3 (∼3/4 at % burnup). This study was not limited either of these conditions and reports on the bubble characteristics observed by transmission and fractographic electron microscopy in high density (96% theoretical) UO2 irradiated between 3.5 and 31.3 x 1020 fissions/cm3 at temperatures below l600°F. Preliminary results from replicas of the as-polished and etched surfaces of these samples were published.

scholarly journals The Influence of Impeller Geometry on the Gas Bubbles Dispersion in Uro-200 Reactor – RTD Curves / Wpływ Rodzaju Wirnika Na Dyspersję Pęcherzyków Gazowych W Reaktorze URO-200 – Krzywe Mieszania

2015 ◽  
Vol 60 (4) ◽  
pp. 2887-2894 ◽  
Author(s):  
M. Saternus ◽  
T. Merder ◽  
J. Pieprzyca
Keyword(s):  
Flow Rate ◽  
Time Distribution ◽  
Residence Time Distribution ◽  
Gas Bubbles ◽  
Refining Process ◽  
Inert Gas ◽  
Impeller Speed ◽  
Batch Reactors ◽  
Liquid Aluminium ◽  
Impeller Geometry

URO-200 reactor belongs to batch reactors used in refining process of aluminium and its alloys in polish foundries. The appropriate level of hydrogen removal from liquid aluminium can be obtained when the mixing of inert gas bubbles with liquid metal is uniform. Thus, the important role is played by the following parameters: flow rate of refining gas, geometry of the impeller, rotary impeller speed. The article presents the results of research conducted on physical model of URO-200 reactor. The NaCl tracer was introduced to water (modelling liquid aluminium) and then the conductivity was measured. Basing on the obtained results the Residence Time Distribution (RTD) curves were determined. The measurements were carried out for two different rotary impellers, flow rate equaled 5, 10, 15 and 20 dm3/min and rotary impeller speed from 250 to 400 rpm every 50 rpm.

scholarly journals Cold Model Experiment on Entrapment of Inclusions in Steel by Inert Gas Bubbles

1992 ◽  
Vol 78 (8) ◽  
pp. 1361-1368 ◽  
Author(s):  
Pan WEI ◽  
Ken-ichiro UEMURA ◽  
Shinji KOYAMA
Keyword(s):  
Model Experiment ◽  
Gas Bubbles ◽  
Inert Gas ◽  
Cold Model ◽  
Inclusions In Steel

Study on the High Shear Degassing Process with Water Simulation

2015 ◽  
Vol 1120-1121 ◽  
pp. 1214-1219
Author(s):  
Yi Yao Kang ◽  
Yue Lin ◽  
Xu Dong Liu ◽  
Chao Sun ◽  
Sen Sen Yuan ◽  
...  
Keyword(s):  
Bubble Size ◽  
Aluminium Alloys ◽  
High Efficiency ◽  
Rotation Speed ◽  
Gas Bubbles ◽  
Inert Gas ◽  
High Shear ◽  
Gas Porosity ◽  
Water Simulation ◽  
Proper Rotation

Hydrogen as the main cause of the gas porosity in aluminium alloys should be removed before casting. The degassing process with intensive melt shearing shows a high efficiency. In the present work, the water simulation was used to study the high shear degassing process and the effect of rotation speed on the size and distribution of inert gas bubbles. The results show that with the increase of rotation speed, the bubble size decreases and the affected region becomes larger. The proper rotation speed of the rotor for the rotor-stator high shear degassing process is 5000-6000 RPM.

Behavior of Inert Gas Bubbles in Forced Convective Liquid Metal Circuits

1976 ◽  
Vol 98 (1) ◽  
pp. 5-11 ◽  
Author(s):  
W. J. Minkowycz ◽  
D. M. France ◽  
R. M. Singer
Keyword(s):  
Liquid Metal ◽  
Bubble Dynamics ◽  
Bubble Radius ◽  
Gas Bubbles ◽  
Inert Gas ◽  
Liquid Sodium ◽  
Gas Bubble ◽  
Flowing Liquid ◽  
Argon Gas ◽  
The Core

Conservation equations are derived for the motion of a small inert gas bubble in a large flowing liquid-gas solution subjected to large thermal gradients. Terms which are of the second order of magnitude under less severe and steady-state conditions are retained, thus resulting in an expanded form of the Rayleigh equation. The bubble dynamics is a function of opposing mechanisms tending to increase or decrease bubble volume while being transported with the solution. Diffusion of inert gas between the bubble and the solution is one of the most important of these mechanisms included in the analysis. The analytical model is applied to an argon gas bubble flowing in a weak solution of argon gas in liquid sodium. Calculations are performed for these fluids under conditions typical of normal and abnormal operation of a liquid metal fast breeder reactor (LMFBR) core and the resulting bubble radius, internal gas pressure, and mass of inert gas are presented in each case. An important result obtained indicates that inert gas bubbles reaching the core inlet of an LMFBR will always grow as they traverse the core under normal and extreme abnormal conditions and that the rate of growth is quite small in all cases.

A multiphysics model for analysis of inert gas bubbles in Molten Salt Fast Reactor

2020 ◽  
Vol 135 (5) ◽  
Author(s):  
Parikshit Bajpai ◽  
Stefano Lorenzi ◽  
Antonio Cammi
Keyword(s):  
Molten Salt ◽  
Fast Reactor ◽  
Gas Bubbles ◽  
Inert Gas

On the binding between inert-gas bubbles and rigid precipitate particles

1971 ◽  
Vol 39 (3) ◽  
pp. 348-349 ◽  
Author(s):  
A.J. Markworth ◽  
E.M. Baroody
Keyword(s):  
Gas Bubbles ◽  
Inert Gas

Dynamics of inert gas bubbles in forced convective systems

1981 ◽  
Vol 24 (9) ◽  
pp. 1433-1441 ◽  
Author(s):  
W.J. Minkowycz ◽  
N.J. Rabadi ◽  
D.M. France
Keyword(s):  
Gas Bubbles ◽  
Inert Gas ◽  
Convective Systems

scholarly journals Inert gas bubbles in neutron-irradiated magnesium oxide

1967 ◽  
Vol 16 (139) ◽  
pp. 165-180 ◽  
Author(s):  
C. S. Morgan ◽  
D. H. Bowen
Keyword(s):  
Magnesium Oxide ◽  
Gas Bubbles ◽  
Inert Gas
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