What are some of the consequences of an undersized kettle type reboiler?

What are some of the consequences of an undersized kettle type reboiler?
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Answer :

The effect will be a decrease in the boiling coefficient. A boiling coefficient depends on a nucleate  boiling component and a two-phase component that depends on the recirculation rate. An undersized  kettle will not have enough space at the sides of the bundle for good recirculation. Another effect is high  entrainment or even a two-phase mixture going back to the tower. Source: Gulley Computer Associates
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