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  • 1980-1984  (6)
  • 1
    Electronic Resource
    Electronic Resource
    Investigation of the structure of two-phase flows. Model media in bubble-column bioreactors (1981)
    Springer
    Applied microbiology and biotechnology 12 (1981), S. 69-75 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary The following two-phase properties were evaluated in bubble column reactors with porous plate (5 μm pore diameter) or perforated plate (1 mm and/or 3 mm hole diameter) gas distributors using distilled water or a 1% methanol solution: transverse profiles of the mean and Sauter bubble diameters, local gas holdups, true mean liquid and bubble velocities. Furthermore, swarm bubble velocity distributions were evaluted and compared with calculated values.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01970037
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Investigation of the structure of two-phase flows in bubble column bioreactors (1981)
    Springer
    Applied microbiology and biotechnology 12 (1981), S. 150-156 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary The following turbulence properties of a bubble column bioreactor were measured using a constant temperature anemometer with wedge shaped probes: intensity, autocorrelation function, micro and macro scales, energy dissipation rate, power spectra and energy dissipation spectra. The influence of the medium, aerator type and gas flow rate on the turbulence properties were considered. The turbulence which prevails in bubble columns is swarm turbulence and cannot be described by grid turbulence when perforated plates are used. The gas flow rate and medium properties exert only slight influences on the shape of the power spectra and energy dissipation spectra. In systems with porous plates, the turbulence has a much finer structure and the maximum of the energy dissipation spectra is closer to the gas dispersion range than in systems with perforated plates. The efficiency of energy utilization for gas dispersion in the former is therefore higher.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01008335
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Characterization of the two-phase systems in airlift tower-loop bioreactors during the cultivation of E. coli (1983)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 25 (1983), S. 437-450 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: During the cultivation of E. coli in an airlift tower-loop bioreactor, the following properties were measured: transverse profiles of Sauter bubble diameter, dS; local relative gas holdup, EG; bubble rise velocity, uBS; local mean velocity, ū turbulence intensity, u′; macrotime scale, TEL; dissipation time scale, τE; power spectrum, E(n); and energy dissipation spectrum D(n) at different distances from the aerator. The influence, distance from the aerator, absence and/or presnece of cells, and batch and/or continuous-culture operation on the behavior of the two-phase system are discussed on the basis of these properties.
    Additional Material: 15 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260250211
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    A study of the reactions of fluorine with hydrogen and methane in the initiation phase using a miniature tubular reactor (1981)
    New York, NY : Wiley-Blackwell
    International Journal of Chemical Kinetics 13 (1981), S. 39-58 
    Details
    ISSN: 0538-8066
    Keywords: Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A small tubular reactor having an inner diameter of 1-2 mm andused as the source in a molecular beam apparatus is described in detail. This arrangement allows the study of fast reactions with reaction times smaller than 1 msec. The preexplosive reaction phase between F2 and H2 and CH4, respectively, is investigated to find out the initiation reactions. In the F2/H2 reaction, initiation is brought about by heterogeneous generation of F atoms or some other surface reaction. Evidence is also obtained for chain branching reactions. In the F2/CH4 case the dominant initiation reaction is the homogeneous reaction CH4 + F2 → CH3 + HF + F. The rate constant for the reaction between 300 and 400 K is 1012.3±0.3 exp[-47 ± 8 kJ/mol/RT] cm3/mol sec. The analysis of the experimental data also yields the rate constant for the propagation reaction CH3 + F2 → CH3 F + F, which is 1012.3±0.3 exp[-4.6 ±2.1 kJ/mol/RT] cm3/mol sec.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/kin.550130105
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Erratum (1981)
    New York, NY : Wiley-Blackwell
    International Journal of Chemical Kinetics 13 (1981), S. 693-693 
    Details
    ISSN: 0538-8066
    Keywords: Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/kin.550130709
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Direct detection of CF2 and computer modeling of its appearance in the fluorination of CH2F2 (1982)
    New York, NY : Wiley-Blackwell
    International Journal of Chemical Kinetics 14 (1982), S. 457-469 
    Details
    ISSN: 0538-8066
    Keywords: Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The branched chain reaction between CH2F2 and F2 is studied in a miniature tubular reactor having a diameter of 1.1 mm. The gases at the end of the tube expand into a low-pressure chamber and are analyzed by molecular beam detection. The branching intermediate CF2 is detected directly at low ionization energies. An approximate quantitative reaction model for the fluorination of CH2F2 is proposed and discussed. The influence of the unknown rate constants in this scheme on the course of the reaction is examined. For the most reasonable set of rate constants the unknown rate constant for the branching reaction CF2 + F2 → CF3 + F at 550 K is found to be log k = 10.7 [cm3/mol·s].
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/kin.550140503
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    Paper (German National Licenses)
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