Fluid Flow Modeling and Simulation for the Coaxial Cable of the LEASAT Antenna System

1992 ◽  
Vol 114 (3) ◽  
pp. 358-360
Author(s):  
Hsien-Yang Yeh ◽  
Hen-Geul Yeh
Keyword(s):  
Fluid Flow ◽  
Pressure Profile ◽  
Antenna System ◽  
Gas Pressure ◽  
Coaxial Cable ◽  
Flow Modeling ◽  
Modeling And Analysis ◽  
Modeling Analysis ◽  
Analysis Computer ◽  
Fluid Flow Modeling

A preliminary fluid flow modeling, analysis, and simulation of the gas pressure profile within a 259 cm long coaxial cable is presented. This coaxial cable is part of the antenna system of the LEASAT satellite. To eliminate the possibility of any corona or arcing phenomenon inside the coaxial cable during operation of the satellite, it is necessary to not only prove experimentally but also show analytically that the gas pressure inside the cable drops down and stays below 0.01 Ton within 24 hours after the satellite enters into its orbit. In this paper, only the analytical work is discussed. The continuum fluid mechanics and the kinetic theory of gases are applied for modeling and analysis. Computer simulation is done by using an IBM XT and the results are presented.

Temperature Distribution and Fluid Flow Modeling of Electron Beam Melting® (EBM)

2012 ◽  
Author(s):  
M. Jamshidinia ◽  
F. Kong ◽  
R. Kovacevic
Keyword(s):  
Electron Beam ◽  
Fluid Flow ◽  
Temperature Distribution ◽  
Molten Pool ◽  
Electron Beam Melting ◽  
Control Volume ◽  
Thermal Analyses ◽  
Scanning Speed ◽  
Flow Modeling ◽  
Fluid Flow Modeling

A three-dimensional (3D) numerical model is developed by using control volume method to analyze the effects of the electron beam scanning speed on the temperature distribution and fluid flow of the liquid phase in the electron beam melting® (EBM) of Ti-6Al-4V powder. The numerical calculations are performed by Fluent codes, in which thermal analyses with and without considering fluid flow in the molten pool are compared. A series of experiments are performed with an Electron Beam Melting® machine to verify the numerical accuracy. Compared to thermal analysis without considering convection in the molten pool, a closer numerical prediction of geometrical size of molten pool to the experimental data can be achieved by using thermal and fluid flow modeling. The difference between the melt pool geometry in the two models is due to the consideration of the effects of the outward flow in the fluid flow model caused by surface tension.

Coupled heat and fluid flow modeling of the CarboniferousKuna Basin, Alaska: implications for the genesis of the Red Dog PbZnAgBa ore district

2003 ◽  
Vol 78-79 ◽  
pp. 215-219 ◽  
Author(s):  
Grant Garven ◽  
Jeff P. Raffensperger ◽  
Julie A. Dumoulin ◽  
Dwight A. Bradley ◽  
Lorne E. Young ◽  
...  
Keyword(s):  
Fluid Flow ◽  
Flow Modeling ◽  
Fluid Flow Modeling ◽  
Heat And Fluid Flow ◽  
Ore District
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