Film formation in a horizontal twin-shaft rotating disk reactor for polymer devolatilization

Film Formation and Mass Transfer Characteristics in a Horizontal Self-Cleaning Twin-Shaft Kneader with Highly Viscous Newtonian Fluids

“…The fluid holdup on impellers increases with the increase in viscosity, while the unbounded film on the kneading bars can be formed. The film on the upper side of impellers is influenced by the overlapping zone and can be defined as the scraped film . The film on the down side of impellers is hardly affected by the overlapping zone and can be defined as the free film .…”

“…The film on the upper side of impellers is influenced by the overlapping zone and can be defined as the scraped film. 13 The film on the down side of impellers is hardly affected by the overlapping zone and can be defined as the free film. 13 Hence, the gas−liquid interface area increases and k L a tends to become larger gradually at the beginning.…”

“…13 The film on the down side of impellers is hardly affected by the overlapping zone and can be defined as the free film. 13 Hence, the gas−liquid interface area increases and k L a tends to become larger gradually at the beginning. However, when the fluid viscosity is too large (50 or 70 Pa•s), the film formed on impellers is more thick and the down side of impellers is almost immersed in the syrup solution (Figure 9).…”

“…12 Cheng et al used CFD simulation combined with the VOF model to investigate the film formation process in a horizontal twin-shaft disk reactor. 13 A free film and scraped film are formed because of the overlapping zone. Film thickness and shape on the rotating disk are mainly determined by the disk clearance.…”

“…Meanwhile, the influences of disk configuration and fluid rheology on the film flow have also been discussed . Cheng et al used CFD simulation combined with the VOF model to investigate the film formation process in a horizontal twin-shaft disk reactor . A free film and scraped film are formed because of the overlapping zone.…”