Figure 3.

(a,b) Showing (i) variation in flow, (ii) shear rate and (iii) pressure fields with the Reynolds, Re and Strouhal, Sr numbers obtained using the simplified model of pendular activity in the duodenum of the rat (BC1, figure 2). The velocity, the shear rate and the pressure were each averaged over half of the period of the cycle of muscular contraction. The vector field shows the mean direction of flow of chyme during this time. Two main types of flow regime were identified depending on the magnitude of Re and Sr (see text). Arrows indicate transects location used for figure 4.