with water, alcohol and/or salts were prepared. Two different alcohols
were tested: methanol and ethanol. Two sodium salts (sulfate
and chloride) and two potassium salts (nitrate and chloride) were
added in different proportions (1–5% by weight). Many different
combinations were tried but, for brevity, only some selected
results are reported here.
Water is usually present in significant amounts and, besides, its
addition in the form of water-in-oil emulsions is a well-known
method to modify the combustion of hydrocarbons due to the massive
occurrence of microexplosions (see, e.g., [14,15]). Therefore, it
could be a plausible candidate responsible for the behaviors
observed with crude glycerol. Fig. 8 shows the results obtained
with water/pure glycerol blends for 10% and 24% water, together
with the curve for crude glycerol. The size of the droplets gradually
decreased, without any visible evidence of microexplosion (at
least, down to diameters