Q. Axial flow impellers

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Q. Bioreactors, where vortex is formed, another dimensionless number, __________ is useful.

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Q. Oxygen transfer rate is increased with an increase in the stirrer speed in aerated bioreactor because

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Q. If the stirring speed increased from 300 to 500 rpm leads to an increase in the reaction rate by two folds. Then it may be concluded that

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Q. An increase in the heat transfer in the stirred tank reactor will be observed at

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Q. The effect of increasing the stirrer speed in an unbaffled stirred tank reactor is that

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Q. Turbulent flow range of mixing speed is obtained for

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Q. For laminar flow, Reynolds number is correlated with power number as (where K, a constant which depends on the container geometry and shape of stirrer; Rei is Reynolds number for agitator; Di, stirrer diameter and N, stirrer speed)

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Q. For turbulent flow, Reynolds number is correlated with power number as (where K, a constant which depends on the container geometry and shape of stirrer; Rei, is Reynolds number for agitator; Di, stirrer diameter and N, stirrer speed)

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Q. In a bioreactor, if at a particular time the oxygen transfer rate is 23 kg.h­¹, then the oxygen uptake will be

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Q. In a two-phase system where the continuous phase remains in place, the gas hold up can be expressed as (where Vs and Vt are the superficial gas velocity and bubble rise velocity)

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Q. What is the effect of the concentration of dissolved salts and sugars on the oxygen transfer rate?

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Q. Which of the following impellers generate a flow parallel to the axis of shaft?

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Q. In a tall reactor, oxygen transfer rates will be

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Q. Which of the following impeller is used in situation where strong vertical currents are desirable for suspending heavily particles?

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