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Fig. 25.4. A simulation with a higher air flux of 0.33 in order to give good performance of a laboratory-scale bioreactor. (a) Volume-weighted biomass content. The solid line represents the results of the simulation. The curve with the solid circles represents the results of the simulation shown in Fig 25.3(a). The dashed line represents growth with the specific growth rate constant equal to /uopt throughout the fermentation. (b) Biomass contents predicted at various fractional heights above the air inlet; (c) Temperatures of the solids at the various heights; (d) Water activities of the solids at the various heights; (e) Fractional specific growth rates based on temperature at the various heights; (f) Fractional specific growth rates based on water activity at the various heights. Key to graphs (b) to (f): Fractional heights of (-) 0.025; (—▲—) 0.5; (—■—) 1.0. The arrows at the top of the graph denote the mixing events

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