The rate of deposition of vanadium pentoxide vapor from combustion gases produced by burning a liquid fuel (kerosene with added vanadium ethyl hexoate) under controlled mixing-history conditions has been shown to agree with the following theoretical mass transfer equation when considering cooled tubes in a transverse gas stream:  
Theoretical and experimental evidence indicates the existence of a “dew point” at a deposition surface temperature of about 670 C. In addition, it would appear that, for the mechanism of deposition under consideration, an “induction” or “immunity” period before the onset of deposition does not exist. Experimental evidence also shows that the rate of deposition was not affected by changes in the excess air level within the range 25 to 1 percent.
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