The overall gas hold-up of a pilot plant scale internal loop airlift reactor was studied in presence of different alcohols in varied concentration. It has been observed that these simple alcohols can enhance overall gas hold-up of the airlift assembly possibly due to formation of protective thin layer over smaller gas bubbles thereby reducing chance of their coalescence. As the alcohols can be used as food source for the micro organisms present in the system, this green and environment friendly process have potential to replace usage of hazardous surfactants often used for enhancing overall hold-up in order to obtain desired mass transfer characteristics. An empirical relationship encompassing overall gas hold-up of the reactor as a function of superficial gas velocity and alcohol concentration is also developed.
Bubbles arise at the intersection of gases with other phases. Their role in the formation and applications of thin films and porous materials is complex. At times they are to be avoided. In other cases they are essential to the desired properties and outcomes. In many cases their function, form and production are misunderstood or disregarded. This review seeks to connect a diverse array of technical and fundamental aspects of bubbles so as to facilitate more control and understanding of their functions and utility
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