Effect of bubbles on turbulent kinetic energy transport in downward flow measured by time-resolved PTV

Julie Lelouvetel, Masashi Nakagawa, Yohei Sato, Koichi Hishida

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

A time-resolved particle tracking velocimetry (PTV) system and a shape projection imaging system were used to investigate the turbulence modifications by bubbles in a downward bubbly flow. Two bubble sizes and three mean void fractions were tested at a Reynolds number of about 20,000. The strong modifications in the mean velocity, turbulent kinetic energy (TKE) budget, and velocity spectra are observed in the central region of the pipe that has a high local void fraction. In particular, kinetic energy production decreased, whereas the TKE dissipation rate increased. This suggests that the transfer of energy due to bubbles has a very large effect on the TKE budget. Moreover, velocity spectra reveal that the presence of bubbles modifies the length scales of turbulent eddies, which contain, transfer, and dissipate energy.

Original languageEnglish
Pages (from-to)813-823
Number of pages11
JournalExperiments in Fluids
Volume50
Issue number4
DOIs
Publication statusPublished - 2011 Apr 1

ASJC Scopus subject areas

  • Computational Mechanics
  • Mechanics of Materials
  • Physics and Astronomy(all)
  • Fluid Flow and Transfer Processes

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