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Comparative study on rheological properties of mycelial broth in filamentous and pelleted forms

  • Biotechnology
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Summary

The rheological properties of mould suspensions were investigated to find out the effect of mycelial morphology on the apparent viscosity with two different growth forms, filamentous and pelleted forms of Absidia corymbifera.

By using a helical ribbon impeller system, the rheological properties could be satisfactorily measured. The experimental data obtained with the filamentous mycelial suspensions showed a marked deviation from Newtonian behaviour and were correlated by a pseudoplastic model. With the pelleted mycelial suspensions, the tendency of Newtonian behaviour was observed. However, at the higher mycelial concentration (>28 g/l) its rheological behaviour was changed toward a pseudoplastic.

The parameters in the pseudoplastic model were compared between these two different morphologies. The consistency indices were correlated with the mycelial dry weight by a simple power law equation and the power law constants found were 2.3 for the filamentous mycelial suspension and 11.3 for the pelleted one.

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Abbreviations

Di :

impeller diameter (cm)

DT :

cup diameter of viscometer (cm)

gc :

acceleration of gravity (cm/s2)

K:

consistency index (c · p)

m:

flow behaviour index (−)

n:

agitation speed (s−1)

Np :

power number (p · gc/n3 D 5i ϱ)

NRe :

Reynolds number (n · D 2i ϱ/μ)

P:

power input (g · cm/s)

X:

biomass concentration (g dry weight/l)

ϱ:

density of fluid (g/ml)

μ:

viscosity (c · p)

τ:

shear stress (dyne/cm2)

γ:

shear rate (s−1)

ϕ:

diameter of pellet (mm) (any system of consistent units may be used)

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Authors and Affiliations

  1. The Korea Advanced Institute of Science and Technology, Chongyangni, POB 150, Seoul, Korea

    Jung H. Kim

  2. Université de Technologie de Compiègne, BP 233, Compiègne, France

    J. M. Lebeault

  3. Technische Universität Berlin, Seestraße 13, D-1000, Berlin 65

    M. Reuss

Authors
  1. Jung H. Kim
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  2. J. M. Lebeault
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  3. M. Reuss
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Kim, J.H., Lebeault, J.M. & Reuss, M. Comparative study on rheological properties of mycelial broth in filamentous and pelleted forms. European J. Appl. Microbiol. Biotechnol. 18, 11–16 (1983). https://doi.org/10.1007/BF00508123

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  • DOI: https://doi.org/10.1007/BF00508123

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