Design and fabrication of light-guiding plate for a photobioreactor that utilizes sunlight

Lim, Hyon-Chol; Kim, Hun; Jang, Kyungmin; Baek, Joon-Hyuck; Yang, Seunghwa; Jeong, Sanghwa; Park, Jong-Rak

doi:10.1007/s10043-015-0129-y

Cited by 7 publications

(2 citation statements)

References 12 publications

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“…Recently, optical sheets have been intensively utilized in the large-scale liquid crystal display devices due to their excellent functions, such as guiding the light propagation path and turning a line or point light source into a uniform surface light source [ 1 , 2 ]. Molding technology of optical polymer microstructures has become a hot issue in this research field to rapidly and environmentally fabricate optical sheets with high quality and large volume [ 3 , 4 ]. The profile and distribution accuracy of the microstructures on the large-area optical sheet directly affect its optical performance and need to be strictly guaranteed.…”

Section: Introductionmentioning

confidence: 99%

Microstructure-Forming Mechanism of Optical Sheet Based on Polymer State Transition in Injection-Rolling Process

2021

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Polymeric optical sheets are significant components in large-scale display devices and are difficult to fabricate due to small size and high accuracy of large-area microstructures. As a newly developed molding technique, injection-rolling is capable of continuously and efficiently achieving large-area microstructures on the polymer surface with short time and high replication. However, the microstructure-forming mechanism during the injection-rolling process has not been fully understood. In this paper, a three-dimensional steady-state heat-flow coupling simulation model of the injection-rolling zone was established to obtain the distributions of the polymer state transition interfaces. According to the state transition interfaces, the entire microstructure-forming process was numerically simulated by dividing into filling and embossing stages to systematically analyze the effects of the polymer state transition interface on filling rate. After this, the relationship between process parameters such as injection temperature, rolling speed, and roll temperature and polymer state transition interface was investigated to develop a position prediction model of the state transition interface. In addition, the optical sheet injection-rolling experiments were also carried out to reveal that the filling rate of the microstructures on the optical sheet can be affected by varying the positions of the state transition interfaces. Therefore, the microstructure-forming mechanism could be revealed as theoretical guidance for the subsequent injection-rolling production with high quality and high efficiency.

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Section: Introductionmentioning

confidence: 99%

Microstructure-Forming Mechanism of Optical Sheet Based on Polymer State Transition in Injection-Rolling Process

2021

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“…More elaborate systems or add-ons include: thin-layer sloping reactors (Grobbelaar et al, 1995); the use of solar collectors (Ono and Cuello, 2006) or light guides (Lim et al, 2015); or the proposed use of pulsed light emitting diodes to create the 'flashing light' effect (Gordon and Polle, 2007). Higher cell densities can be maintained in PBRs thereby reducing water needs and harvesting costs, the latter being a major expense of algal cultivation.…”

Section: Systems Designmentioning

confidence: 99%

Photosynthesis of microalgae in outdoor mass cultures and modelling its effects on biomass productivity for fuels, feeds and chemicals

Yarnold¹

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Practical applications of microalgae include uses as feedstocks for sustainable fuels, feeds, nutraceuticals, and chemicals; for the treatment of wastewater and industrial flue gas; and for use as recombinant protein expression systems. Improvements in biomass yields are required for commercially viable and sustainable algal technologies, particularly for low value commodities such as biofuels.Although several algae exhibit higher growth rates than terrestrial crops, with theoretical upper limits of 8-10% photon conversion efficiency (PCE), solar-illuminated outdoor microalgal production systems typically have a PCE far below this and even below those achieved under laboratory conditions. The most intractable limiting factor is poor light distribution through the mass culture, where photoinhibitory light at the surface and dark zones deeper in the culture reduce photosynthetic productivity. Moreover, microalgae have evolved a suite of photoacclimation and photoregulation mechanisms to cope with rapid (seconds to minutes) light fluxes in natural environments, yet these processes remain poorly understood in well-mixed photobioreactors.The aim of this thesis study was to combine an experimental and theoretical approach to: 1) investigate and understand the photosynthetic response of algae under mass culture conditions; 2) develop a mathematical model which could accurately predict light-tobiomass productivities under a broad range of design scenarios for outdoor production systems; and 3) identify key biological and design parameters to maximise biomass yields.In the first part of the study, a light-to-biomass model was developed that could be easily applied to rapidly assess biomass yields of different algal strains under a range of design scenarios. This model predicts temporal and spatial irradiance at the reactor surface and through the mass culture with inputs of local solar radiation data, local coordinates, system properties and the optical properties of the culture. Local growth rates are then coupled to local light intensities within the reactor based on a static Haldane growth model derived from empirical growth-irradiance curves. Growth rates are integrated over space and time to compute areal and volumetric productivities.Validation of the model was attempted by conducting batch harvest experiments in a laboratory scale photobioreactor matrix which simulated diurnal light cycles representative of three 'typical' days of solar radiation in Brisbane. The strains used were ii Chlamydomonas reinhardtii and its truncated light-harvesting antenna mutant, tla1, reported to possess improved optical properties. Initially, the model did not satisfactorily predict growth under batch cultivation for the three different incident light conditions, overestimating productivity under low light days and overestimating on high light days.Subsequent adjustment of the model to include photoacclimative changes in the optical properties of the cell and a re-fit of the growth parameter values provided a more accurate m...

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Theoretical and experimental investigation of an ultrathin optical polymer light guide plate during continuous injection direct rolling

Feng

Lou

Lei

2021

Int J Adv Manuf Technol

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Design and fabrication of light-guiding plate for a photobioreactor that utilizes sunlight

Cited by 7 publications

References 12 publications

Microstructure-Forming Mechanism of Optical Sheet Based on Polymer State Transition in Injection-Rolling Process

Microstructure-Forming Mechanism of Optical Sheet Based on Polymer State Transition in Injection-Rolling Process

Photosynthesis of microalgae in outdoor mass cultures and modelling its effects on biomass productivity for fuels, feeds and chemicals

Theoretical and experimental investigation of an ultrathin optical polymer light guide plate during continuous injection direct rolling

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