Publication detail

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.

Original Title

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

Type

journal article in Web of Science

Language

English

Original 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 gaseliquid 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. (c) 2023 IAgrE. Published by Elsevier Ltd. All rights reserved.

Keywords

CFD; multiphase flow; photobioreactor; PIV validation; shear stress; agitation

Authors

REBEJ, M.; JUŘENA, T.; VONDÁL, J.; FUENTE HERRAIZ, D.; ČERVENÝ, J.; JEGLA, Z.

Released

22. 6. 2023

Publisher

ACADEMIC PRESS INC ELSEVIER SCIENCE

Location

SAN DIEGO

ISBN

1537-5110

Periodical

BIOSYSTEMS ENGINEERING

Year of study

230

Number

22.6.2023

State

United Kingdom of Great Britain and Northern Ireland

Pages from

35

Pages to

50

Pages count

16

URL

https://www.sciencedirect.com/science/article/pii/S153751102300079X

BibTex

@article{BUT184188,
  author="Miroslav {Rebej} and Tomáš {Juřena} and Jiří {Vondál} and David {Fuente Herraiz} and Jan {Červený} and Zdeněk {Jegla}",
  title="Numerical simulations and validation of single- and two-phase flow in a stirred lab-scale photobioreactor",
  journal="BIOSYSTEMS ENGINEERING",
  year="2023",
  volume="230",
  number="22.6.2023",
  pages="35--50",
  doi="10.1016/j.biosystemseng.2023.04.004",
  issn="1537-5110",
  url="https://www.sciencedirect.com/science/article/pii/S153751102300079X"
}