Light propagation in algae photobioreactors
Šíření světelného záření v řasových fotobioreaktorech
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České vysoké učení technické v Praze
Czech Technical University in Prague
Czech Technical University in Prague
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V práci byl proveden výzkum metod CFD zaměřených na šíření světla ve fotobioreaktorech řas pomocí radiačních modelů v softwaru ANSYS Fluent. Software ANSYS Fluent nabízí různé modely záření, které lze použít pro simulaci šíření světla ve fotobioreaktorech. Tyto modely mimo jiné vyžadují různé parametry, absorpční koeficient, který by mohl popisovat účinek snížení intenzity světla s ohledem na vzdálenost od osvětlené stěny, hustotu řas a hydrodynamiku systému. Všechny tyto faktory mohou mít podstatný dopad na účinnost takového systému. V softwaru ANSYS Fluent jsou simulace CFD prováděny s některými z dostupných modelů pro daný případ s ohledem na intenzitu světla. Hodnocení těchto modelů je založeno na jejich teoretické schopnosti zohlednit gradienty světla a hustotu kultury řas, která je v přímém vztahu s absorpcí kultury. Různé modely nabízejí odlišné výstupy, ale cílem této práce je poskytnout nejvhodnější modely, uzavřít výsledky a navrhnout možná zlepšení budoucí práce.
In the work, research concerning CFD methods focused on light propagation in algae photobioreactors using radiation models in ANSYS Fluent software has been carried out. ANSYS Fluent software offers various radiation models which could be used for the simulation of light propagation in photobioreactors. These models require various parameters among others, the absorption coefficient which could describe the effect of light intensity decrease with respect to the distance from illuminated wall, density of algae, and hydrodynamics of the system. All these factors can have substantial impact on the effectivity of such system. In the ANSYS Fluent software, CFD simulations are performed with some of the available models for the given case with respect to light intensity. The assessment of these models is based on their theoretical ability to account for the light gradients and density of algae culture which is in direct relation with the absorptivity of the culture. Different models offer distinguished outcomes but the aim of this work is to provide the most suitable models, conclude with the results and propose possible improvements in future work.
In the work, research concerning CFD methods focused on light propagation in algae photobioreactors using radiation models in ANSYS Fluent software has been carried out. ANSYS Fluent software offers various radiation models which could be used for the simulation of light propagation in photobioreactors. These models require various parameters among others, the absorption coefficient which could describe the effect of light intensity decrease with respect to the distance from illuminated wall, density of algae, and hydrodynamics of the system. All these factors can have substantial impact on the effectivity of such system. In the ANSYS Fluent software, CFD simulations are performed with some of the available models for the given case with respect to light intensity. The assessment of these models is based on their theoretical ability to account for the light gradients and density of algae culture which is in direct relation with the absorptivity of the culture. Different models offer distinguished outcomes but the aim of this work is to provide the most suitable models, conclude with the results and propose possible improvements in future work.