Towards enhancement of gas–liquid mass transfer in bioelectrochemical systems: Validation of a robust CFD model

Mohsen Karimi, Tove Widén, Yvonne Nygård, Lisbeth Olsson* (Corresponding Author), Henrik Ström

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

5 Citations (Scopus)

Abstract

Mass transfer has been identified as a major bottleneck in gas fermentation and microbial conversion of carbon dioxide to chemicals. We present a pragmatic and validated Computational Fluid Dynamics (CFD) model for mass transfer in bioelectrochemical systems. Experiments were conducted to measure mixing times and mass transfer in a Duran bottle and an H-cell. An Eulerian–Eulerian framework with a simplified model for the bubble size distribution (BSD) was developed that utilized only one additional equation for the bubble number density while including the breakup and coalescence. Validations of the CFD model for mixing times showed that the predictions were within the confidence intervals of the measurements, verifying the model's capability in simulating the hydrodynamics. Further validations were performed using constant and varying bubble diameters for the mass transfer. The results showed the benefits of a simplified BSD model, as it yielded improvements of seven and four times in accuracy when assessed against the experimental data for the Duran bottle and H-cell, respectively. Modeling of the H-cell predicted that a lower stirring rate improves mass transfer compared with higher stirring rates, which is of great importance when designing microbial cultivation processes. The model offers a feasible framework for advanced modeling of gas fermentation and microbial electrosynthesis.

Original languageEnglish
Pages (from-to)3953-3961
Number of pages9
JournalBiotechnology and Bioengineering
Volume118
Issue number10
DOIs
Publication statusPublished - Oct 2021
MoE publication typeA1 Journal article-refereed

Keywords

  • bubble number density
  • computational fluid dynamics
  • H-cells
  • mass transfer
  • microbial cultivations
  • Bioreactors
  • Models, Biological
  • Bioelectric Energy Sources
  • Computer Simulation

Fingerprint

Dive into the research topics of 'Towards enhancement of gas–liquid mass transfer in bioelectrochemical systems: Validation of a robust CFD model'. Together they form a unique fingerprint.

Cite this