Multi_R_Designer Tutorial

---

1) Open Case problem 4.2.mr.

2) Select the Discriminate series  button, check the Code discrimination option and select General flow regime. The following diagram is obtained.
 

3) Logarithmic scaling usually gives better description when dealing with large domains. Therefore, change the Y-axis normal scale into a logarithmic scale. Select the Edit graphic properties button . In the Axis tab, then Vertical tab, check the box related to the Logarithmic scale in the Range panel. Press OK.
 

CONCLUSION #1:  It becomes obvious here that high interaction flow operation increases by all means the local liquid-side mass transfer coefficient (k_La). However, it still unclear what kind of flow operation (i.e. trickle flow, pulsing flow, bubble flow) induces better mass transfer performance in trickle-bed reactors. For a better interpretation of the actual results on k_La, change the discriminate code from General flow regime to Specific flow regime. The following diagram should be more explicit.
 

CONCLUSION #2:  Low interaction regime, which can be associated to the trickle flow regime, often reduces the reactor mass transfer potential (or gas/liquid spreading and interfacial area) since it is dealing generally with low gas and liquid flow rates. However, for cases involving dispersed bubble flow operation (green dots) which unequivocally increases the gas/liquid interfacial area, k_La increases significantly yet probably to the expense of higher pressure drop.

Multi_R_Designer Tutorial