Optimum Aspect Ratio for a Fermenter

What is the optimum aspect ratio (or height/diameter ratio) is for a fermenter?   The best answer is “it depends”. There is simply no universal optimum. The best design is worked on a case-by-case basis. We can list some factors that affect the optimum. Note that as aspect ratio increases, the following results are produced:

• The vessel cost usually increases, except at the transition between shop fabricated and field fabricated vessels;
• The total power (agitator + compressor) decreases at constant mass transfer rate;
• The available heat transfer area increases;
• The blend time is longer;
• The composition is less uniform, especially DO;
• The agitator gear drive becomes less expensive as there is less torque;
• More impellers are needed; and
• The shaft design often becomes more challenging.

These are but a few of the factors affecting the optimum aspect ratio.  Some factors will favor a taller aspect ratio, while others will favor a shorter ratio.

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