Induced Flow in Straight Channels

Steady Drag-induced Flow in Straight Channels, 162... 

STEADY DRAG-INDUCED FLOW IN STRAIGHT CHANNELS... 

To facilitate an understanding of how particulate solids are transported through a single-screw extruder we start with a model for drag-induced flow in straight channels. We then summarize the equations for flow of particulate solids in the single-screw extruder. We next add heat transfer to the transport of the particulate solids. 

In some cases, for example when large residence times are desired, comparatively long microchannels have to be integrated into a compact microreaction device, a task that can only be achieved with curved channels. In addition to this, straight channels are often not suited for connecting a microflow domain to the external world. One of the first theoretical studies on flow in curved channels was done by Dean [32, 33], who investigated the secondary flow perpendicular to the main flow direction induced by inertial forces using a perturbative analysis. 

Due to the similarity of the flow profiles, most of these passive, continuous-flow schemes can, in principle, also be adopted for centrifugally driven flows. In addition, the availability of the Coriolis pseudo force/c (4) offers an intrinsic means for the generation transversal flow components, even in straight radial channels exhibiting a constant cross section (Fig. 8). Due to the scaling of forces //c (13), the Coriolis-force induced mixing is... 

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