A time-dependent model for high-pressure discharges in narrow ablative capillaries

1993 ◽  
Vol 50 (1) ◽  
pp. 51-70 ◽  
Author(s):  
D. Zoler ◽  
S. Cuperman ◽  
J. Ashkenazy ◽  
M. Caner ◽  
Z. Kaplan
Keyword(s):  
High Pressure ◽  
Equation Of State ◽  
Time Dependent ◽  
Dimensional Model ◽  
Plasma Sources ◽  
One Dimensional ◽  
Space And Time ◽  
Dependent Model ◽  
Energy Equations ◽  
Time Dependent Model

A time-dependent quasi-one-dimensional model is developed for studying high- pressure discharges in ablative capillaries used, for example, as plasma sources in electrothermal launchers. The main features of the model are (i) consideration of ablation effects in each of the continuity, momentum and energy equations; (ii) use of a non-ideal equation of state; and (iii) consideration of space- and time-dependent ionization.

One-dimensional freezing of seawater in a constrained volume

1995 ◽  
Vol 32 (1) ◽  
pp. 122-127 ◽  
Author(s):  
Krzysztof Szilder ◽  
Edward P. Lozowski ◽  
Tom W. Forest
Keyword(s):  
Thermal Conductivity ◽  
Heat Capacity ◽  
Sea Ice ◽  
Laboratory Experiments ◽  
Time Dependent ◽  
Latent Heat Release ◽  
One Dimensional ◽  
Dependent Model ◽  
The One ◽  
Time Dependent Model

A numerical time-dependent model of the one-dimensional fusion of seawater with limited salt rejection has been developed. The process of latent heat release, as brine cools and freezes, as well as changes of the specific heat capacity and thermal conductivity of sea ice with temperature have been incorporated into the model. The model predicts the variation of the brine temperature and the motion of the liquid–solid interface. Laboratory experiments have been performed to verify the model. Five centimetre layers of fresh water and brine of salinities 5, 10, 15, and 20%o were poured on an insulated surface and exposed to cold air from above. A comparison between the experimental results and the model prediction shows satisfactory agreement. Key words : sea ice, freezing, salinity, heat conduction, ice islands.

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