Fluid- und Wärmetransport Strömungslehre

Microorganisms growing in biofilms might be possible biocatalysts for future biotechnological production processes. Attached to a surface and embedded in an extracellular polymeric matrix, they create their preferred environment and form robust cultures for continuous systems. With the objective of implementing highly efficient processes, productive biofilms need to be understood comprehensively. In this study, the influence of microstructured metallic surfaces on biofilm productivity was researched. To conduct this study, titanium and stainless steel sheets were polished, micromilled, as well as coated with particles. Subsequently, the metal sheets were exposed to the lactic acid producing Lactobacillus delbrueckii subsp. lactis under laminar and homogeneous flow conditions in a custom-built flow cell. A proof-ofconcept showed that biofilm formation in the system only occurred on the designated substratum. Following a 24-h batch cultivation for primary biofilm development, the culture was continuously provided with glucose containing medium. As different experimental series have indicated, the process resulted to be stable for up to eleven days. Primary metabolite productivity averaged around 6-7 g/(L h). Interestingly, the productivity was shown to be affected neither by the type of metal, nor by the applied microstructures. Nevertheless, a higher dry biomass weight determined on micro-milled substratum indicates a complementary differentiation of biofilm components in future experiments.

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“…According to Schwister and Leven ,

Re = w \cdot {normald}_{normalh} / v

as well as Merker and Baumgarten ,

{normald}_{normalh} = 4 \cdot A / {normalP}_{r}

…”

Section: Methodsmentioning

confidence: 99%

Analyzing the influence of microstructured surfaces on the lactic acid production of Lactobacillus delbrueckii lactis in a flow‐through cell system

Schlegel

Chodorski

Huster

et al. 2017

Engineering in Life Sciences

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“…Concerning the ÿrst point one may conclude that an incompressible ow model is appropriate. On the other hand, large density and temperature variations cannot be modelled using the usual Boussinesq approximation for incompressible ows with energy transport (see uid dynamic literature like References [6][7][8][9]). Moreover, commercial software packages to simulate compressible ow models in general do not take into account the low-Mach-number regime.…”

Section: Introductionmentioning

confidence: 99%

An asymptotic‐induced one‐dimensional model to describe fires in tunnels II: the stationary problem

Gasser

2003

Math Methods in App Sciences

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SUMMARYWe study stationary solutions of a one-dimensional low-Mach-number model derived in Gasser and Struckmeier (Math. Meth. Appl. Sci. 2002; 25(14): 1231) to describe ÿre events in long tunnels. The existence of solutions of the corresponding stationary model is shown to be equivalent to the existence of solutions of an algebraic problem. Multiple solutions are shown to be possible. The relation between di erent formulations of the problem is analysed. Weak and special distributional solutions are considered. Finally, numerical examples of realistic tunnel data with single and multiple solutions of the stationary problem are given.

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An asymptotic‐induced one‐dimensional model to describe fires in tunnels

Gasser

Struckmeier

2002

Math Methods in App Sciences

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SUMMARYWe derive a simple one-dimensional model for the description of ÿre events in long vehicle tunnels, which is based on appropriate low-Mach number asymptotics as well as on averaging procedure along the cross-section of a tunnel. Turbulent e ects are modelled using a phenomenological model. Numerical simulations based on a standard ÿnite-di erence method show the ability of the new model to describe ÿres in tunnels at least qualitatively.

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Fluid- und Wärmetransport Strömungslehre

Cited by 17 publications

References 0 publications

Analyzing the influence of microstructured surfaces on the lactic acid production of Lactobacillus delbrueckii lactis in a flow‐through cell system

Analyzing the influence of microstructured surfaces on the lactic acid production of Lactobacillus delbrueckii lactis in a flow‐through cell system

An asymptotic‐induced one‐dimensional model to describe fires in tunnels II: the stationary problem

An asymptotic‐induced one‐dimensional model to describe fires in tunnels

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