Figure 4 d shows that like Newtonian fluid, the velocity peak value of non-Newtonian fluid gradually decreased with decreasing ratio of aeration time to anaerobic time. Drag force can be determined as follows: No gas holdup distribution at the bottom of the bubble column was observed at
Bubble column reactor
Turbulent effects were modeled by the RNG k - model. There was a difference in drag force equation between Newtonian and non-Newtonian fluids [ 21 ], so the simulation results would be evaluated. The data used to support the findings of this study are available from the corresponding author upon request. Besides, we also used the EE to simulate the liquid-gas flow in the bubble column with uniform bubble size in order to validate bubble column bottom advantages of EEPBM.
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The liquid can be in parallel flow or counter-current. It consists of a vertically-arranged cylindrical column filled with liquid, at the bottom bubble column bottom which gas is inserted. To further analyze the effect of the aeration time and anaerobic time on the gas holdup, the time-averaged global gas holdup in the bubble column was determined. It could be found that for Newtonian fluid, the horizontal velocity in Cases 5 and 7 changed periodically to some different extent, meaning that bubble plume oscillation during continuous aeration also existed during intermittent aeration. Instantaneous gas holdup distribution.
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