Side capacity

Example 15.7 Determine the washout function for the side capacity model... 

FIGURE 15.6 Side capacity model of stagnancy in a CSTR. 

FIGURE 15.7 Effect of a stagnant zone in a stirred tank reactor according to the side capacity model. 

FIGURE 15.8 Semilog plot of washout function showing two slopes that correspond to the two time constants in the side capacity model. 

Vs Volume of side tank in side capacity model Exam. 15.7... 

The imperfect mixing in a chemical reactor can be modeled by splitting the total volume into two perfectly mixed sections with circulation between them. Feed enters and leaves one section. The other section acts like a side-capacity element. 

Supply side capacity heat capacity of steam coils... 

Schmidt numbers for liquids are about 10, compared to 1 for gases, so molecular diffusion may be the key to the difference. The effect of high velocity near the tube wall might be offset by molecular diffusion in gas tests but not in tests with liquids. Another explanation is that pockets of fluid act as side capacities throughout the bed, and diffusion from these pockets is quite slow in liquids, leading to greater tracer dispersion [30]. 

---