Mass transfer slug-drop flow

Table 7.8 Mass transfer literature on slug-drop and deformed interface flow. ...

In this section, the liquid-liquid slug flow MSR and its main charaderistics with respect to pressure drop, RTD, heat/mass transfer and chemical reaction are presented. 

The Froude number allows the effect of slug flow turbulence on the corrosion rate to be correctly quantified. Specifically, the pressure drop across the slug is used as a measure of the effect of the turbulence and, as mentioned, this can be related to the enhanced mass transfer. From Fig. 6-21, it can be seen that the corrosion rate varies exponentially with respect to pressure drop across the slug. The value of the exponent is constant at around 0.3. This is an important result which comes from using the Froude number in the film as defined by Eq. (6-1). 

Monolith multiphase chemical reactors are another example of microfluidic multiphase flow applications. The slug flow pattern enhances the mass transfer in the liquid-solid process. There is also low-pressure drop for a given specific contact area. Machado et al (1999) have patented the use of monolith reactors for fast and highly exothermic nitroaromatic hydrogenation. In this process, the product is recycled through the reactors several hundreds of times, and the low-pressure-drop monolith reactor is therefore preferred. 

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