Abstract
The feasibility of a relatively simple lithium metal spray structural cooling system was demonstrated experimentally. The metal was vaporized in a closed container and three coated columbium-alloy nose-cap models were cooled using a fine-mist spray. System internal pressure was varied to permit vaporization of the lithium droplets at temperatures between 1500° and 1700°F. External surface temperatures were held below 2200°F by the spray cooling under heat fluxes of up to 610 Btu/ft-sec, corresponding to a radiation equilibrium temperature of 5800°F. Although instrumentation difficulties precluded experimental determination of the maximum heat flux capability, a conservative analytical extrapolation of test results indicated the limit to be at least 1200 Btu/ft-sec. Post-test visual examination of the nose-cap samples revealed no evidence of corrosion.
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