Accession Number : AD0616361

Title :   A COMPARISON OF THE CAPABILITIES OF A FUEL COKER AND THE MINEX HEAT EXCHANGER FOR DETERMINING HYDROCARBON FUEL THERMAL STABILITY.

Descriptive Note : Rept. for Jun 63-Oct 64,

Corporate Author : AIR FORCE AERO PROPULSION LAB WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Zengel,Alan E.

Report Date : MAR 1965

Pagination or Media Count : 99

Abstract : Hydrocarbon jet fuels degrade at high temperatures to leave lacquer-like deposits on hot surfaces. Presently, a fuel's resistance to thermal degradation is determined by visually rating a color on a tube that has been exposed to hot fuel. Unfortunately, the visual rating is difficult to interpret in terms of such engineering parameters as the effect on heat transfer. In this report, comparisons are made between the visual results obtained with a coker and the results obtained with a small, highly-instrumented Minex heat exchanger. The comparisons show that a reasonable correlation between the results obtained with the heat exchanger and with the coker may be achieved if three or more coker tests are analyzed on the basis of tube wall temperature versus deposit rating. By measuring the thickness of the film deposited and by knowing the effect of this thickness on heat transfer, a thermal conductivity can be calculated. The study showed that the calculated thermal conductivity was essentially the same for all of the seven fuels tested, the average thermal conductivity being 0.05 Btu/(hr)(sq ft)(F/ft). (Author)

Descriptors :   (*HYDROCARBONS, DEGRADATION), (*JET ENGINE FUELS, STABILITY), PYROLYSIS, TEST EQUIPMENT, HEATERS, HEAT EXCHANGERS, FILMS, HEAT TRANSFER, THERMAL CONDUCTIVITY

Distribution Statement : APPROVED FOR PUBLIC RELEASE