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Home Courses The Basics of Transport Phenomena Course materials Readings 7.2 Theory and practice, medium: exercises (examples)

7.2 Theory and practice, medium: exercises (examples)

Course subject(s) 7. Transport phenomena in the world around us

A large-scale bioreactor is used in the production of bakers’ yeast. The reactor is a bubble column, with cylindrical shape, liquid height 15 m, and diameter 5 m. The column is gassed with air, to provide oxygen transfer to the cells and removal of the CO2 produced, and for liquid mixing.

159101761_XS

The gas volume fraction is equal to ϵG = 0.3 and the biomass volume fraction is ϵX=0.3 (equivalent to a dry matter content of 100 g/l). The bubbles have a diameter of 5 mm and the cells a diameter of 5 µm.

Exercise 2

Consider the industrial fermenter of the theory video, with a heat production of 51 MW. Suppose you need to keep the fermenter at 30 °C , because that is the temperature at which the micro-organisms work the most efficient. So, you need to cool the fermenter and you do this with a heat exchanger.

Sketch_fermentor

The heat exchanger uses inflowing water of 15 °C.

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