Quiz 3 concepts Flashcards
For diffusivity when the solvent is water, _________ correlation is used
Othmer and Thakar
Above some critical bulk oxygen concentration, the cell metabolic machinery is _________ with oxygen
saturated
In the final phase of the process which involves only this biotransformation, oxygen demand is ____________ to product formation through the ___________
directly coupled; stoichiometry
In two-film theory, mass transfer coefficient is ________ with film thickness
inversely proportional
In ______ theory, the mass transfer coefficient is directly proportional with exposure time
penetration
In surface renewal theory, mass transfer is __________ to the square root of diffusivity
directly proportional
The mass transfer coefficient is highly ________ on vessel’s interfacial area and chemical properties of the fluid
dependent
Dimesionless number that involves mass and momentum diffusion
Schmidt number (Sc)
Dimensionless number that is expressed in terms of mass transfer by convection over mass diffusivity
Sherwood number
The variation of inverse transmittance with interfacial area is
linear/exponential
Maximizing the oxygen transfer rate is by ______ the power consumption
optimizing
In dynamic gassing out technique, the ____________ electrode is used to measure oxygen concentration
polarographic
Used to measure the aeration capacity of a fermenter
Oxygen Transfer Coefficient
The ______ is the most frequently used technique for the determination of average mean diameter in gas-liquid dispersion.
Laser diffraction
A stable side is achieved when turbulent fluctuation s and surface tension forces are in __________
balance
For aerated mixing vessels in an aqueous solutions, the mass transfer coefficient is _______ proportional to the power consumption
inversely
The low solvent viscosity can result in a significant _________ in the mass transfer consumption
increase
The efficiency and mass transfer coefficients drop significantly at __________ concentrations
low surfactant
The level of DO in the media is a function of _____________
time
ratio of power for the aerated fluid and the non-aerated powered system
power number
