Numerical simulations and validation of single- and two-phase flow in a stirred lab-scale photobioreactor

Rebej, M; Juřena, T; Vondál, J; Fuente Herraiz, D; Červený, J; Jegla, Z

Numerical simulations and validation of single- and two-phase flow in a stirred lab-scale photobioreactor

Rebej, M Juřena, T Vondál, J Fuente Herraiz, D Červený, J Jegla, Z

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Publisher:: ACADEMIC PRESS INC ELSEVIER SCIENCE
Publication Type:: Journal Article
Citation:: Biosystems Engineering, 2023, 230, pp. 35-50
Issue Date:: 2023-06-01

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Field	Value	Language
dc.contributor.author	Rebej, M
dc.contributor.author	Juřena, T
dc.contributor.author	Vondál, J
dc.contributor.author	Fuente Herraiz, D
dc.contributor.author	Červený, J
dc.contributor.author	Jegla, Z
dc.date.accessioned	2024-02-09T05:20:36Z
dc.date.available	2024-02-09T05:20:36Z
dc.date.issued	2023-06-01
dc.identifier.citation	Biosystems Engineering, 2023, 230, pp. 35-50
dc.identifier.issn	1537-5110
dc.identifier.issn	1537-5129
dc.identifier.uri	http://hdl.handle.net/10453/175549
dc.description.abstract	A particle image velocimetry (PIV) technique was used to measure velocity fields of single- and multi-phase fluid flow in a stirred, flat-panel photobioreactor and to validate the computational fluid dynamics (CFD) model. The paper presents the grid independence study, velocity profiles, and shear stresses that were studied under four different operating conditions, i.e. two different agitation speeds, 360 rpm, and 480 rpm, and with or without aeration of 200 ml min−1. The single-phase numerical model showed a correlation in the improved accuracy, and the mesh refinement, even though using a very fine mesh, did not justify the increased computational costs, making a medium mesh more practical. Similarly, the two-phase flow analyses showed a good qualitative agreement with the PIV data. However, PIV measurement in bubbly flows is a challenging task, possibly having large uncertainties due to light effects at the gas–liquid interface. Nevertheless, the large vortex formed near the rotating magnetic stirrer was found to dominate the flow pattern in both, single- and multi-phase, simulations. The effect of the aeration on shear stresses was, naturally, more noticeable with lower agitation speeds. However, with both agitation speeds, the highest shear stresses around the stir bar were found to quickly decay. Thus, the environment in the photobioreactor can be considered appropriate for the cultivation of microalgae.
dc.language	English
dc.publisher	ACADEMIC PRESS INC ELSEVIER SCIENCE
dc.relation.ispartof	Biosystems Engineering
dc.relation.isbasedon	10.1016/j.biosystemseng.2023.04.004
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	0999 Other Engineering
dc.subject.classification	Agronomy & Agriculture
dc.subject.classification	4099 Other engineering
dc.title	Numerical simulations and validation of single- and two-phase flow in a stirred lab-scale photobioreactor
dc.type	Journal Article
utslib.citation.volume	230
utslib.for	0999 Other Engineering
pubs.organisational-group	University of Technology Sydney
pubs.organisational-group	University of Technology Sydney/Faculty of Science
utslib.copyright.status	closed_access	*
dc.date.updated	2024-02-09T05:20:34Z
pubs.publication-status	Published
pubs.volume	230

Abstract:

A particle image velocimetry (PIV) technique was used to measure velocity fields of single- and multi-phase fluid flow in a stirred, flat-panel photobioreactor and to validate the computational fluid dynamics (CFD) model. The paper presents the grid independence study, velocity profiles, and shear stresses that were studied under four different operating conditions, i.e. two different agitation speeds, 360 rpm, and 480 rpm, and with or without aeration of 200 ml min−1. The single-phase numerical model showed a correlation in the improved accuracy, and the mesh refinement, even though using a very fine mesh, did not justify the increased computational costs, making a medium mesh more practical. Similarly, the two-phase flow analyses showed a good qualitative agreement with the PIV data. However, PIV measurement in bubbly flows is a challenging task, possibly having large uncertainties due to light effects at the gas–liquid interface. Nevertheless, the large vortex formed near the rotating magnetic stirrer was found to dominate the flow pattern in both, single- and multi-phase, simulations. The effect of the aeration on shear stresses was, naturally, more noticeable with lower agitation speeds. However, with both agitation speeds, the highest shear stresses around the stir bar were found to quickly decay. Thus, the environment in the photobioreactor can be considered appropriate for the cultivation of microalgae.

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http://hdl.handle.net/10453/175549