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Table 2. Thermal Diffusivity of Liquid UO2 from Measurements of Thermal Diffusivity and Thermal Conductivity

Experiment Kim et al. [1] Otter & Damien [2] Tasman et al. [3,4]
Property Measured Thermal Diffusivity Thermal Diffusivity Thermal Conductivity
Method Periodic Heat Flow

Laser Flash

 Laser Heating - Melt & Ablate UO2 self-contained sample
Sample

UO2 in tungsten

3 -layers; UO2 layer:

0.8 mm, 1.2 mm

UO2 in tungsten

3 -layers;

UO2 layer: 0.7 mm

UO2 6-mm diam. disc

partially molten; molten layer: 0.2 mm

Reported , m2 s-1

19 x 10-7 - 33 x 10-7 *

16 x 10-7 - 25 x 10-7

-

Re-evaluated 3-dim. transient heat transfer model [5]

11 x 10-7 (thin)

15 x 10-7 (thick)



16 x 10-7



Re-measurement & f.e.m.** analysis under unsteady conditions;

, m2 s-1 [4]

6 x 10-7 - 8 x 10-7



* In the assessment by Fink and Leibowitz, an error was found in the original analysis by Kim et al. that indicated that these values reported by Kim et al. are high by about a factor of two.

** f.e.m. stands for finite element method

Assessed 1996
Version 0 for Peer Review