Accession Number : ADA289847

Title :   Mechanism of Deposit Formation on Fuel-Wetted Hot Metal Surfaces.

Descriptive Note : Interim rept. May 89-Dec 92,

Corporate Author : SOUTHWEST RESEARCH INST SAN ANTONIO TX BELVOIR FUELS AND LUBRICANTS RESEARCH FACILITY

Personal Author(s) : Stavinoha, Leo L. ; Westbrook, Steven R. ; McInnis, Lona A.

PDF Url : ADA289847

Report Date : JAN 1995

Pagination or Media Count : 91

Abstract : Experiments were performed in a Single-Tube Heat Exchanger (STHE) apparatus and a Hot Liquid process meet Jet Fuel Thermal Oxidation Tester (JFTOT) ASTM D 3241 requirements. The HLPS-JFTOT heater tubes used were 1018 mild steel, 316 stainless steel (SS) 304 SS, and 304 SS tubes coated with aluminum, magnesium, gold, and copper. A low-sulfur was used to create deposits on the heater tubes at temperatures of 300 deg C, 340 deg C, and 380 deg C. Deposit voltage and Auger ion milling. Pronounced differences between the deposit thickness measuring techniques suggested that both Auger milling rate and the dielectric strength of the deposit may be affected by deposit morphology/composition (such as metal ions that have become included in the bulk of the deposit). Carbon burnoff data were obtained as a means of judging the validity of DMD-derive deposit evaluations. ESCA data suggest that the thinnest deposit was the magnesium-coated test tube. The scanning Electron Microscope (SEM) photographs showed marked variations in the deposit morphology and the results suggested composition has a significant effect on the mechanism of deposition. (jg)

Descriptors :   *METALS, *SURFACES, *DEPOSITS, *WETTING, *JET ENGINE FUELS, MAGNESIUM, MEASUREMENT, THICKNESS, STABILITY, LIQUIDS, HIGH TEMPERATURE, ELECTRON MICROSCOPES, ELECTRONIC SCANNERS, MORPHOLOGY, RATES, STAINLESS STEEL, VOLTAGE, HEAT EXCHANGERS, ION BEAMS, STEEL, DEPOSITION, OXIDATION, COPPER, ALUMINUM, SULFUR, DIELECTRIC STRENGTH, GOLD, AUGERS, DIESEL FUELS, CUTTING, FUEL INJECTION, CHEMICAL MILLING.

Subject Categories : Physical Chemistry
      Organic Chemistry
      Fuels
      Jet and Gas Turbine Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE