Foam formation in wet heavy fuel oils
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Foam formed by boiling wet fuel oil follows the usual laws of other kinds of foam.
The height of fuel-oil foam depends on the initial height of the unfoamed fuel oil, its water content, its grade (i.e., viscosity and surface tension), and the amount of heat applied to the bed and also on the presence of a radiation source above it. The stability of the fuel-oil foam depends on the viscosity of the fuel oil, its water content, and the height of the initial bed.
A radiant-heat source above the fuel oil destroys the upper layers of foam.
The amount of dry fuel oil evaporated in steam bubbles depends on the light-fraction contentof the fuel oil.
Foaming of fue] oil produces fine spray. In bubbling-type burners the foaming fuel-oil bed acts as an atomizer.
KeywordsRadiation Viscosity Burner Foam Steam
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