Effect of electric fields on mass transfer to droplets. Final report

Technical Report · Tue Feb 01 04:00:00 EST 1994

DOI:https://doi.org/10.2172/10133065· OSTI ID:10133065

Carleson, T E; Budwig, R

During the six year funding period, the effects of a direct and alternating field upon single drop hydrodynamics and mass transfer were evaluated both experimentally and theoretically. Direct current field effects upon drop size, velocity and mass transfer rates were also observed for multiple drops formed in a three stage sieve tray column. Drop size, velocity, and mass transfer rates were measured experimentally and compared to simple models for direct current electric fields. Agreement between theory and experiment was found for drop charge, size, and velocity. Drop mass transfer coefficients were substantially larger than theoretical predictions while extraction efficiencies were moderately higher. Drop distortion and oscillation were observed and are thought to result in the experimentally observed higher values. For alternating current fields, drop flow streamlines and oscillations were measured and found to compare well with predictions from a solved mathematical model. In addition, equipment was constructed to determine mass transfer rates to oscillating drops. Concentration profiles in still and oscillating drops were measured and qualitatively compared to theoretical predictions.

• Research Organization: Idaho Univ., Moscow, ID (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: FG07-86ER13572
• OSTI ID: 10133065
• Report Number(s): DOE/ER/13572--T1; ON: DE94008181; BR: KC0302020
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420400
ALTERNATING CURRENT
DROPLETS
ELECTRIC FIELDS
HEAT TRANSFER AND FLUID FLOW
HYDRODYNAMICS
MASS TRANSFER
PROGRESS REPORT