An Introduction to Bioreactor Hydrodynamics and Gas-Liquid by Enes Kadic

By Enes Kadic

Reviews and compares the most important forms of bioreactors, defines their professionals and cons, and identifies learn wishes and figures of advantage that experience but to be addressed

  • Describes universal modes of operation in bioreactors
  • Covers the 3 universal bioreactor forms, together with stirred-tank bioreactors, bubble column bioreactors, and airlift bioreactors
  • Details much less universal bioreactors kinds, together with fastened mattress bioreactors and novel bioreactor designs
  • Discusses benefits and downsides of every bioreactor and gives a strategy for optimum bioreactor choice in line with present strategy needs
  • Reviews the issues of bioreactor choice globally whereas contemplating all bioreactor strategies instead of targeting one particular bioreactor type

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Additional resources for An Introduction to Bioreactor Hydrodynamics and Gas-Liquid Mass Transfer

Sample text

8) To obtain the average gas holdup ???? in a column section between two locations separated by a distance Δz = z2 − z1 (> 0), average both sides of Eq. 10) where Δp = p1 − p2 (> 0) with p1 and p2 the pressures at locations z1 and z2 , respectively, and ???? w represents the average wall shear stress in the same column section. Tang and Heindel (2006a) denoted the gas holdup measurement based on Eq. 10) as Method I (???? I ) where it totally accounts for the wall shear stress effects and provides accurate gas holdup values based on the assumptions above.

As stated earlier, the one-layer model is an oversimplification of actual conditions typically observed, and hence, a three-layer model is typically employed. , 1982). While the three-layer model is more suited to quantifying the electrode response to transient conditions, it only provides the foundation for determining the electrode 38 EXPERIMENTAL MEASUREMENT TECHNIQUES response constant due to the many factors, as listed in the literature, that may affect it. Electrode design aspects such as membrane type, membrane thickness, cathode surface area, electrolyte, and electrode style all profoundly affect the behavior of the electrode response to oxygen partial pressure.

2 Volumetric Method. The volumetric method is simple and robust in principle, but rather inaccurate in practice. This method relies on the conversion of dissolved oxygen to carbon dioxide which is then driven out of solution. As the carbon dioxide is driven out of solution, it is collected and its volume is determined at a known pressure and temperature. Then, using the ideal gas law and an elemental balance for the oxygen to carbon dioxide reaction, the oxygen concentration is determined. , 1992).

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