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Fig. 25.5. Effect of the air flux on predicted performance of larger bioreactors. (a) Solids temperatures and (b) solids water activities at various heights within in a 1 m high bioreactor with an air flux of 0.1 kg-dry-air m-2 s-1; (c) Solids temperatures and (d) solids water activities at various heights within in a 1 m high bioreactor with an air flux of 0.33 kg-dry-air m-2 s-1; (e) Solids temperatures and (f) solids water activities at various heights within in a 2 m high bioreactor with an air flux of 0.66 kg-dry-air m-2 s-1. In all cases, the other parameters are as given in Tables 25.1, 25.2, and 25.3. The horizontal lines represent temperatures and water activities that give fractional specific growth rates of (---) 0.9 and (■■■■) 0.8. Key to graphs (a) to (f): Fractional heights of (-) 0.025; (—▲—) 0.5; (—■—) 1.0. The arrows at the top of each graph denote the mixing events

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