Accession Number : AD0741820

Title :   Unsteady Heat Transfer in Erosivity Experiments.

Descriptive Note : Memorandum rept.,

Corporate Author : BALLISTIC RESEARCH LABS ABERDEEN PROVING GROUND MD

Personal Author(s) : Nelson,Carl W. ; Ward,J. Richard

Report Date : APR 1972

Pagination or Media Count : 22

Abstract : Although TiO2/wax liners are used in U. S. large caliber guns to reduce erosion, the erosion-reducing mechanisms of these liners is still under investigation. Two sets of investigators found a correlation between specific heat of the metal oxide and its ability to reduce wear. There was no evidence in either report that time required for the metal oxide particle to absorb heat was taken into account. We have calculated the time required for the average temperature of metal oxides tested as wear reducing additives to reach steady-state. Up to a diameter of 10 micron, thermal equilibrium is reached before the particles reach the section of the apparatus where erosion is measured. (Author)

Descriptors :   (*GUN BARRELS, EROSION), (*HEAT TRANSFER, GUN BARRELS), TITANIUM COMPOUNDS, DIOXIDES, WAXES, WEAR RESISTANCE, PARTICLE SIZE, ADDITIVES

Subject Categories : Guns

Distribution Statement : APPROVED FOR PUBLIC RELEASE