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Csögör, Zsuzsa; Herrenbauer, Michael; Schmidt, Karsten; Posten, Clemens

doi:10.1023/a:1017974232510

Cited by 70 publications

(5 citation statements)

References 20 publications

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“…Simulation tools for the light supply and the algae trajectories in PBR are advanced and already validate many algorithms, including the discrete ordinate method (DOM) [8], the Monte Carlo (MC) algorithm [9,10], and finite volume method (FVM) [11] for light supply, and various Euler-Lagrange models for the trajectories [5,12,13]. Nevertheless, the combination of models for coupling the light supply with the algae trajectories (eventually taking additional mass transfer into account) remains a numerical challenge.…”

Section: Introductionmentioning

confidence: 99%

Comprehensive Computational Model for Coupled Fluid Flow, Mass Transfer, and Light Supply in Tubular Photobioreactors Equipped with Glass Sponges

et al. 2022

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The design and optimization of photobioreactor(s) (PBR) benefit from the development of robust and quantitatively accurate computational fluid dynamics (CFD) models, which incorporate the complex interplay of fundamental phenomena. In the present work, we propose a comprehensive computational model for tubular photobioreactors equipped with glass sponges. The simulation model requires a minimum of at least three submodels for hydrodynamics, light supply, and biomass kinetics, respectively. First, by modeling the hydrodynamics, the light–dark cycles can be detected and the mixing characteristics of the flow (besides the mass transport) can be analyzed. Second, the radiative transport model is deployed to predict the local light intensities according to the wavelength of the light and scattering characteristics of the culture. The third submodel implements the biomass growth kinetic by coupling the local light intensities to hydrodynamic information of the CO2 concentration, which allows to predict the algal growth. In combination, the novel mesoscopic simulation model is applied to a tubular PBR with transparent walls and an internal sponge structure. We showcase the coupled simulation results and validate specific submodel outcomes by comparing the experiments. The overall flow velocity, light distribution, and light intensities for individual algae trajectories are extracted and discussed. Conclusively, such insights into complex hydrodynamics and homogeneous illumination are very promising for CFD-based optimization of PBR.

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Section: Introductionmentioning

confidence: 99%

Comprehensive Computational Model for Coupled Fluid Flow, Mass Transfer, and Light Supply in Tubular Photobioreactors Equipped with Glass Sponges

et al. 2022

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show abstract

“…Simulation tools for both, light supply and algae trajectory in PBR are advanced and already validated for many algorithms including DOM [7], MC [8,9] and FVM [10] for light supply, and various Euler-Lagrange models for the trajectories [4,11,12]. However, the combination of both tools, eventually taking additional mass transfer into account, remains a numerical challenge.…”

Section: Introductionmentioning

confidence: 99%

Comprehensive computational model for coupled fluid flow, mass transfer and light supply in tubular photobioreactors equipped with glass sponges

Mink¹,

Schediwy²,

Posten³

et al. 2021

Preprint

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The design and optimization of photobioreactors (PBR) can benefit from the development of robust and yet quantitatively accurate computational models, that incorporate the complex interplay of fundamental phenomena. At a minimum, the simulation model requires at least three submodels for hydrodynamic, light supply and biomass kinetics as pointed out by various review articles on computational fluid flow models for PBR design. By modeling the hydrodynamics, the light-dark-cycles can be detected and the mixing characteristic of the flow besides its mass transport is analyzed. The radiative transport model is deployed to predict the local light intensities according to wavelength of the light and scattering characteristic of the culture. The third submodel implements the biomass growth kinetic, by coupling the local light intensities to hydrodynamic information of CO2 concentration, to predict the algal growth.The developed mesoscopic simulation model is applied to a tubular PBR with transparent walls and internal sponge structure. The complex hydrodynamics and the homogeneous illumination in such reactors is very promising for CFD based optimization.

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“…Besides a significant reduction of heat load, this provides access to the whole toolbox of spectral engineering, including intensity modulation, temporal cycling and spectral conversion. Various designs have therefore been tested for implementing volumetric light dilution, for example, using light-guides with diffusing surfaces such as plates 35 , tubes 36 , rods 37 or fiber 38–42 . In particular the latter seems to be most promising due to the following reasons: First, highest flexibility is ensured in terms of geometrical arrangement into a skeleton of light strands with adapted illumination density and microfluidic properties.…”

Section: Introductionmentioning

confidence: 99%

Biomimetic light dilution using side-emitting optical fiber for enhancing the productivity of microalgae reactors

Wondraczek

Gründler

Reupert

et al. 2019

Sci Rep

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Photoautotrophic microbes present vast opportunities for sustainable lipid production, CO 2 storage and green chemistry, for example, using microalgae beds to generate biofuels. A major challenge of microalgae cultivation and other photochemical reactors is the efficiency of light delivery. In order to break even on large scale, dedicated photon management will be required across all levels of reactor hierarchy – from the harvesting of light and its efficient injection and distribution inside of the reactor to the design of optical antenna and pathways of energy transfer on molecular scale. Here, we discuss a biomimetic approach for light dilution which enables homogeneous illumination of large reactor volumes with high optical density. We show that the immersion of side-emitting optical fiber within the reactor can enhance the fraction of illuminated volume by more than two orders of magnitude already at cell densities as low as ~5 10 4 ml −1 . Using the green algae Haematococcus pluvialis as a model system, we demonstrate an increase in the rate of reproduction by up to 93%. Beyond micoralgae, the versatile properties of side-emitting fiber enable the injection and dilution of light with tailored spectral and temporal characteristics into virtually any reactor containment.

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Untitled

Cited by 70 publications

References 20 publications

Comprehensive Computational Model for Coupled Fluid Flow, Mass Transfer, and Light Supply in Tubular Photobioreactors Equipped with Glass Sponges

Comprehensive Computational Model for Coupled Fluid Flow, Mass Transfer, and Light Supply in Tubular Photobioreactors Equipped with Glass Sponges

Comprehensive computational model for coupled fluid flow, mass transfer and light supply in tubular photobioreactors equipped with glass sponges

Biomimetic light dilution using side-emitting optical fiber for enhancing the productivity of microalgae reactors

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