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Effect of emulsification conditions on mean drop size

Effect of emulsification conditions on mean drop size. Ivan. B. Ivanov, Nina Vankova, Slavka Tcholakova, Vasko Vulchev, and Nikolai D. Denkov Faculty of Chemistry, Sofia University,Sofia, Bulgaria. Aim. To determine the effects of different factors on the mean drop size:

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Effect of emulsification conditions on mean drop size

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  1. Effect of emulsification conditions on mean drop size Ivan. B. Ivanov, Nina Vankova, Slavka Tcholakova, Vasko Vulchev, and Nikolai D. Denkov Faculty of Chemistry, Sofia University,Sofia, Bulgaria

  2. Aim To determine theeffects of different factors on the mean drop size: • Construction of the processing elements • Viscosity of the oil phase • Viscosity of the aqueous phase

  3. Gas bottle Emulsification method Experimental set-up Used processing elements Two consecutive slits with 1 mm length One slit with 1 mm length One slit with 2 mm length

  4. Effect of the construction of processing element on the mean drop size Variations in the constructions of the processing elements lead to: ~ 20 % increase of the flow rate ~ 10 % decrease of d32

  5. Effect of the construction of processing element on the mean drop size From the experiment we know p and Q. Assuming VDISS = const   = pQ/VDISS Ratio of d32/dk The studied constructions of the processing elements do not affect VDISS

  6. Effect of the viscosity of the oil phase Mean drop size for 5 wt % ROX + Silicone oils Deformation time For effective emulsification tRES should be at least 10 times longer than DEF

  7. Emulsification in viscous turbulent flow Hexadecane + 1 wt % WPC + 60 % Sugar, C = 16.6 mPa.s Size of the smallest eddies Drop diameter in viscous turbulent flow VDISS for viscous turbulent flow is close to VDISS for inertial turbulent flow

  8. Conclusions • The studied constructions of the processing element do not affect significantly the hydrodynamic conditions and the emulsification efficiency. • The successful emulsification of oils with moderate viscosity ( ~ 600 mPa.s), requires longer emulsification time and/or higher driving pressure. • The increase of the viscosity of the aqueous phase above ca. 13 mPa.s leads to emulsification in viscous turbulent regime (VDISS remains almost the same).

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