New PDF release: An Introduction to Bioreactor Hydrodynamics and Gas-Liquid

By Enes Kadic

ISBN-10: 1118104013

ISBN-13: 9781118104019

Reviews and compares the key different types of bioreactors, defines their execs and cons, and identifies study wishes and figures of advantage that experience but to be addressed

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

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Extra info for An Introduction to Bioreactor Hydrodynamics and Gas-Liquid Mass Transfer

Example text

1 Bed Expansion. One of the simplest methods to measure global gas holdup, ????, is to measure the bed expansion upon gassing. 6) where H is the liquid height at a given gas flow rate and H0 corresponds to the initial liquid height. This assumes that the bulk liquid velocity is zero. The liquid expansion height is very easy to identify at low gas flow rates, but this identification is more challenging at high gas flow rates due to fluctuations at the free surface caused by bubble disengagement. In industry, this level may be identified with an electronic float to continuously monitor the gas holdup.

11) but provides more accurate gas holdup values in cocurrent systems. Hence, using Eq. 12), more accurate gas holdup measurements in cocurrent multiphase systems can be made with only pressure measurements, and the calculation is as simple as that required by Eq. 11). Furthermore, no knowledge of wall shear stress is required for Eq. 12), which is not the case for Eq. 10). Tang and Heindel (2006a) have shown that gas holdup in a cocurrent air–water–fiber bubble column was simple and accurate with Eq.

2000) compared three different chemical methods: (i) Danckwerts’ method using the absorption of CO2 in sodium or potassium carbonate buffer solutions, (ii) the sodium sulfite method involving the oxidation of sulfite ions, and (iii) the sodium dithionite method involving the oxidation of dithionite ions. All three methods were shown to produce similar interfacial area measurements. 6 21 Bubble Size and Velocity Bubble size and bubble velocity measurement techniques have been reviewed by Saxena et al.

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

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