Heat transfer in a liquid metal crucible with an integral blackbody cavity

Technical Report · Fri May 15 04:00:00 EDT 1992

OSTI ID:7200338

Havstad, M A

Calculations of the heat transfer in a liquid metal crucible with an integral blackbody cavity have been made using two- and three-dimensional finite element techniques. Computations of thermal gradients and radiant heat exchange out of the cavity are combined to estimate cavity apparent emissivity (or quality) in a total hemispherical sense. We adjusted the model to estimate quality in a normal total sense, and then we used the Planck function to estimate normal spectral quality over the wavelength range 0.4 to 10 {mu}m. Because of the small cavity size, its proximity to the crucible's heat source, and the conductivity of the crucible material, the estimated cavity quality is high, >98% . The crucible design analyzed here was employed in an apparatus for the measurement of the normal spectral emissivity and optical constants of liquid uranium and aluminum. We found the results to be conservative.

• Research Organization: Lawrence Livermore National Lab., CA (United States)
• Sponsoring Organization: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 7200338
• Report Number(s): UCRL-LR-110322; ON: DE92019640
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420400* -- Engineering-- Heat Transfer & Fluid Flow
661300 -- Other Aspects of Physical Science-- (1992-)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BLACKBODY RADIATION
CAVITIES
CRUCIBLES
DESIGN
ELECTROMAGNETIC RADIATION
ELEMENTS
ENERGY TRANSFER
FINITE ELEMENT METHOD
FLUIDS
HEAT FLUX
HEAT TRANSFER
LIQUID METALS
LIQUIDS
METALS
NUMERICAL SOLUTION
RADIATIONS
TEMPERATURE GRADIENTS
THREE-DIMENSIONAL CALCULATIONS
TWO-DIMENSIONAL CALCULATIONS