Accession Number:

AD0645558

Title:

HEAT TRANSFER FROM RADIOISOTOPIC HEAT SOURCES BURIED IN THE OCEAN FLOOR,

Descriptive Note:

Corporate Author:

NAVAL RADIOLOGICAL DEFENSE LAB SAN FRANCISCO CALIF

Personal Author(s):

Report Date:

1966-11-02

Pagination or Media Count:

55.0

Abstract:

Data were obtained that show clearly that the modes of heat transfer of interest in a porous bottom material will be convection and nucleate boiling. In the natural convection regime, the temperature of the capsule surface above ambient is substantially lower than it would be if heat were transferred by conduction only. For the conditions of the present tests the threshhold of convection appears to be at a heat flux of 100 to 200 Btuhr sq ft. The existence of nucleate boiling in the porous material provides very much more effective heat transfer than predicted by conduction models. Thus the capsule life should be greater. This does, however, make it essential to determine the burnout limits on the nucleate boiling regime. Apparatus was developed and used to obtain the thermal conductivity, permeability, and porosity of Monterey sand 12 mesh and Ottawa sand 90 mesh. It appears that at least 12 thermocouples will be necessary to adequately describe the temperature of the capsule surface. Author

Subject Categories:

  • Physical and Dynamic Oceanography
  • SNAP (Systems for Nuclear Auxiliary Power) Technology
  • Thermodynamics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE