Surface Deposition within Treated and Untreated Stainless-Steel Tubes Resulting from Thermal-Oxidative Degradation of Jet Fuel

Two kinds of flowing experiments were performed using jet fuel to assist the understanding of the effect of a stainless-steel surface (316) or a passivated surface on thermal-oxidative degradation. In the first kind, the entire heated surface was either stainless-steel (3160 or was treated with a relatively passive layer. Dissolved O2 consumption over a range of temperatures was measured to assist the understanding of fuel oxidation with different surfaces. In the second kind of experiment, the length of treated tubing was gradually increased with the intention of progressively influencing the surface deposition. At the location where surface deposition started (35 cm), the wall temperature was ∼ 245°C and the bulk temperature was ∼ 200°C. Under these conditions, the bulk fuel was rapidly oxidizing while the dissolved O2 in the fuel near the wall was already fully consumed. The passivation of an active surface in combination with thermal stability additives could lead to a significant synergistic reduction of surface deposition