Abstract
This work investigates cavitation patterns after a cylindrical coaxial orifice at different orifice to outlet channel diameter ratios β<0.1. Further the influence of cavitation pattern on emulsion formation efficiency in high pressure homogenization is shown. At constant pressure loss (Δp) and varying β, three characteristic cavitation patterns (jet cavitation, choked cavitation and hydraulic flip) were detected via high speed imaging and acoustical measurement. The study shows that a surfactant concentration up to 10−4mol·L−1 and disperse phase content up to 10wt.% do not influence cavitation pattern transition in the investigated fluid. Emulsification results indicate decreasing emulsification efficiency with increasing β and thereby a strong correlation to the detected cavitation patterns.
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