Nutrient uptake in a suspension of squirmers

Takuji Ishikawa, Shunsuke Kajiki, Yohsuke Imai, Toshihiro Omori

研究成果: Article査読

6 被引用数 (Scopus)

抄録

Nutrient uptake is one of the most important factors in cell growth. Despite the biological importance, little is known about the effect of cell-cell hydrodynamic interactions on nutrient uptake in a suspension of swimming micro-organisms. In this study, we numerically investigate the nutrient uptake in an infinite suspension of squirmers. In the dilute limit, our results are in good agreement with a previous study by Magar et al. (Q. J. Mech. Appl. Maths, vol. 56, 2003, pp. 65-91). When we increased the volume fraction of squirmers, the nutrient uptake of individual cells was enhanced by the hydrodynamic interactions. The average nutrient concentration in the suspension decayed exponentially as a function of time, and the relaxation time could be scaled using the Sherwood number, the Péclet number and the volume fraction of cells. We propose a fitting function for the Sherwood number, which is useful in predicting nutrient uptake in the non-dilute regime. Furthermore, we analyse the swimming energy consumed by individual cells. The results indicate that both the energetic cost and the nutrient uptake increased as the volume fraction of cells was increased, and that the uptake per unit energy was not significantly affected by the volume fraction. These findings are important in understanding the mass transport and metabolism of swimming micro-organisms in nature and for industrial applications.

本文言語English
ページ(範囲)481-499
ページ数19
ジャーナルJournal of Fluid Mechanics
789
DOI
出版ステータスPublished - 2016 1 22

ASJC Scopus subject areas

  • 凝縮系物理学
  • 材料力学
  • 機械工学

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