Agitation and Aeration MCQs

Why vortexing is undesirable in the agitation of biological systems?

The rate limiting step in the movement of oxygen from the gas phase in a bubble to the cell is the movement of oxygen molecules through

Penetration theory assumes that turbulent eddies travel from the bulk of the phase to the interface where they remain constant for a constant exposure time (te). The model correlating KL, mass transfer coefficient and DAB, diffusivity can be expressed as

The oxygen uptake requirements of a microbial population is characterized by the following parameters: μm = 0.2 h-1, K0 = 0.2 mg O2.l-1, Y0 = 0.5 mg dry weight/mg O2 and C0,crit=0.8 mg.l-1 The required concentration of cells is 1000 mg.l-1 and the saturation oxygen concentration of the medium is 5.8 mg.l-1. The required KLa must be greater than

Which have the maximum resistance while transferring carbon dioxide from the bulk liquid to an air bubble?

If liquid density and viscosity remains constant, then the Reynolds number in a stirred tank reactor will vary with the

What is the ratio of depth of liquid in vessel to the diameter of tank (H:Dt)?

Radial flow impellers

Transient flow range of mixing speed is obtained for