demonstrated that pressure drop increases substantially if dry slug flow occurs or if microchannels with significant surface roughness are employed. Those influences were not accounted for in the models presented. KeywordsMultiphase flow • Three-phase flow • Liquidliquid-gas • Slug flow • Microchannel • Pressure drop • Surface roughness List of symbols A Area (m 2 ) c Constant in Bretherton's pressure drop equation, c = 9.04 in this work (-) Ca Capillary number (-) Ca b Capillary number based on bubble velocity at the tube outlet and gas-liquid surface tension (-) Ca d Capillary number based on bubble velocity at the tube outlet and liquid-liquid surface tension (-) D Diameter (m) d c Diameter of the test tube (m) f Slug frequency (1/s) h Film thickness (m) L Length (m) ΔP Pressure drop (Pa) r Radius (m) Re Reynolds number (-) RS t Surface roughness parameter: absolute peak to valley distance (m) U Superficial velocity (m/s) u Velocity of bubble or droplet (m/s) We Weber number (-) z Distance in the z-direction (m)

Design Automation has been in focus of research and application for several decades. This paper aims at establishing the current view of design automation and identification of potential for adoption based on a survey conducted in German speaking countries and a hypothesis based multivariate analysis based on networks. The findings show that design automation is still considered a means of automation of repetitive design tasks and potential for enhanced application exists. The necessity for methods supporting designers for identification and definition of design automation tasks is urged.

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