Flow experiments using heated Jet-A fuel and additives were performed to study the effects of
treated surfaces on surface deposition. The experimental apparatus was designed to view
deposition due to both thermal oxidative and pyrolytic degradation of the fuel. Carbon burnoff
and scanning electron microscopy were used to examine the deposits. To understand the effect
of fuel temperature on surface deposition, computational fluid dynamics was used to calculate
the two-dimensional temperature profile within the tube. Three kinds of experiments were
performed. In the first kind, the dissolved O2 consumption of heated fuel is measured on different
surface types over a range of temperatures. It is found that use of treated tubes significantly
delays oxidation of the fuel. In the second kind, the treated length of tubing is progressively
increased which varies the characteristics of the thermal-oxidative deposits formed. In the third
type of experiment, pyrolytic surface deposition in either fully treated or untreated tubes is studied.
It is found that the treated surface significantly reduced the formation of surface deposits for
both thermal oxidative and pyrolytic degradation mechanisms. Moreover, it was found that the
chemical reactions resulting in pyrolytic deposition on the untreated surface are more sensitive
to pressure level than those causing pyrolytic deposition on the treated surface.
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