Temporal scaling of the growth dependent optical properties of microalgae

Zhao, Junming; Ma, Chunyang; Liu, L.H.

doi:10.1016/j.jqsrt.2018.04.024

Cited by 14 publications

(7 citation statements)

References 34 publications

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“…The microplastic-deionized water suspension is similar to a translucent-absorbing scattering medium, where the radiative transfer process can be quantitatively described by the radiative transfer equation as follows: 16 – 19 s·∇Iλ(r,s)=−βλIλ(r,s)+ks,λ4π∫Ω′=4πIλ(r,s′)Φ(s′,s)dΩ′,where Iλ indicates the spectral radiation intensity, βλ=ka,λ+ks,λ indicates the spectral extinction coefficient, ka,λ indicates the spectral absorption coefficient, ks,λ indicates the spectral scattering coefficient, and …”

Section: Radiative Transfer Theorymentioning

confidence: 99%

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Thermal radiative properties of polyamide-12 from 0.2 to 1.1 μm

et al. 2023

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Microplastics are an emerging marine pollutant, and their negative impacts on the photosynthetic efficiency of marine photoautotrophs are gradually endangering marine ecosystems and biota. To analyze and solve the impact of microplastic particles on light propagation in the ocean, the investigation of radiative properties of microplastic particles is essential. The extinction and absorption coefficients of polyamide-12 (PA12) with different particle concentrations are experimentally measured using transmission and integration methods in the spectral range of 200 to 1100 nm. The extinction and absorption cross sections are obtained from the measured extinction and absorption coefficients. The measured PA12 absorption peaks, located at 692, 728, 764, 835, and 940 nm, correspond to the vibrational absorption of methylene groups (-CH 2 ) and amide groups (CO-NH). The scattering albedo of PA12 is mostly above 0.7 in the visible spectral, indicating that PA12 is a scattering dominated medium. The measured radiative properties of PA12 provide optical parameters for determining the radiative transfer containing microplastics.

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Section: Radiative Transfer Theorymentioning

confidence: 99%

Section: Radiative Transfer Theorymentioning

confidence: 99%

Thermal radiative properties of polyamide-12 from 0.2 to 1.1 μm

et al. 2023

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“…Lorentz-Mie’s theory was used to theoretically calculate the SPF and asymmetry factor of the microplastics based on the complex refractive index of the materials ( Peiponen et al, 2019 ) and the optical constants of surrounding water ( Segelstein, 1981 ). Therefore, the absorption coefficient measurement is acceptable by using the forwardly spectral normal hemispherical transmittance, which is relatively straightforward and readily implemented under the condition that certain accuracy is guaranteed ( Ma et al, 2018b ; Zhao et al, 2018 ). Supplementary Figure S2 shows the particle size distribution for the two different microplastics with approximately spherical shapes.…”

Section: Experimental Methodsmentioning

confidence: 99%

Toward a better understanding of microalgal photosynthesis in medium polluted with microplastics: a study of the radiative properties of microplastic particles

Yang

2023

Front. Bioeng. Biotechnol.

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Due to the wide presence of microplastics in water, the interaction between microplastic particles and microalgae cells in medium merits the attention of researchers. Microplastic particles can impact the original transmission of light radiation in water bodies since the refractive index of microplastics is different from that of water bodies. Accordingly, the accumulation of microplastics in water bodies will certainly impact microalgal photosynthesis. Therefore, experimental measurements and theoretical studies characterizing the radiative properties of the interaction between light and microplastic particles are highly significant. The extinction and absorption coefficient/cross-section of polyethylene terephthalate and polypropylene were experimentally measured using transmission and integrating methods in the spectral range of 200–1,100 nm. The absorption cross-section of PET shows remarkable absorption peaks in the vicinity of 326 nm, 700 nm, 711 nm, 767 nm, 823 nm, 913 nm, and 1,046 nm. The absorption cross-section of PP has distinctive absorption peaks near 334 nm, 703 nm, and 1,016 nm. The measured scattering albedo of the microplastic particles is above 0.7, indicating that both microplastics are scattering dominant media. Based on the results of this work, an in-depth understanding of the interaction between microalgal photosynthesis and microplastic particles in the medium will be obtained.

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“…where Besides, the temporal evolution spectral absorption and scattering cross-sections were experimentally measured in Refs. [13][14][15].…”

Section: Light Transfer Through Microalgae Suspensionsmentioning

confidence: 99%

On the theoretical prediction of microalgae growth for parallel flow

Ma¹

2020

Preprint

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Background: The established microalgae growth models are semi-empirical or considerable fitting coefficients exist. Therefore, the ability of the model prediction is reduced by the numerous fitting coefficients. Furthermore, the predicted results of the established models are dependent on the size of the photobioreactor (PBR), light intensity, flow and concentration field. The growth mechanism of microalgae has not clearly understood in PBR cultivation. It is difficult to predict the microalgae growth by theoretical methods, owing to the aforementioned factors. We developed an exploratory bridging microalgae growth model to predict the microalgae growth rate in PBRs by using the nondimensional method which is effectively in fluid dynamics and heat transfer. Results: The analytical solution of the growth rate was obtained for the parallel flow. The nondimensional growth rate expressed as function of Reynolds number and Schmidt number, which can be used for arbitrary parallel flow due to the solution was expressed as nondimensional quantities. The theoretically predicted growth rate is compared with the experimentally measured microalgae growth rate on the order of magnitude. Conclusions: The nondimensional method successfully applied to the microalgae growth problem for the first time. The general nondimensional solution can unify the numerous experimental data for different laboratory conditions, and give a direction for the disorder of the microalgae growth problem. The nondimensional solution will be useful in the design and operation of PBRs for biofuel production.

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Temporal scaling of the growth dependent optical properties of microalgae

Cited by 14 publications

References 34 publications

Thermal radiative properties of polyamide-12 from 0.2 to 1.1 μm

Thermal radiative properties of polyamide-12 from 0.2 to 1.1 μm

Toward a better understanding of microalgal photosynthesis in medium polluted with microplastics: a study of the radiative properties of microplastic particles

On the theoretical prediction of microalgae growth for parallel flow

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