engleski

Effect of surface roughness on flow profile of liquid-liquid system in a microreactor

Microreactors provide very large interfacial surface-to-volume ratio, effective mass and heat transfer and easier process control comparing to classic reactor. Due to these advantages they are widely applied for multiphase reactions. Microreactors were primarily used for gas-liquid systems [1] and lately they become were interesting for application in liquid-liquid systems [2]. To insure the optimal conditions for performing multiphase reaction in microreactor, hydrodynamic conditions must be optimised. Introducing two immiscible liquids in to microreactor slug flow and parallel flows can be formed. According to Dessimoz et al.[3] flow pattern formation depends on linear velocity of both phases, ratio of the phases, fluid transport properties, microreactor channel geometry and construction material. In this work analysis of the liquid –liquid flow profile was preformed. Six organic solvents (dichloromethane, ethyl acetate, diethyl ether, hexane, chloroform and toluene) as one phase together with water as second phase were introduced in the microreactor. Two microreactors with internal volume of V = 4 mm3 and V = 6 mm3 with different surface roughness were used to analyse effect of surface roughness on flow profiles. The flow profiles in the microchannel were monitored by microscope. The analysis based on specific dimensionless numbers (Reynolds, Capillary and Weber) was performed to get the better insight in process dominant for specific flow profile formation.

surface roughness; microreactor; flow profile; dimensionless numbers

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