Quasi 3-D measurements of turbulence structure in horizontal air–water bubbly flow

✍ Scribed by Jian Yang; Mingyuan Zhang; Chaojie Zhang; Yuliang Su; Xianran Zhu

• Publisher: Elsevier Science
• Year: 2004
• Tongue: English
• Weight: 360 KB
• Volume: 227
• Category: Article
• ISSN: 0029-5493
• DOI: 10.1016/j.nucengdes.2003.11.009

✦ Synopsis

Quasi 3-D measurements of the turbulence structure of air-water bubbly flow in a horizontal tube with 35 mm i.d. are undertaken with two TSI "X"-type hot-film probes. The turbulent fluctuations, u f , v f , w f , in axial, radial and circumferential directions, respectively, and Reynolds stresses -uv and -uw are obtained. It is found that in the lower portion of the tube, the profiles of turbulent fluctuation and Reynolds stress resemble those of single phase flow; whereas in the upper portion of the tube, where the bubble population is high, the turbulence, especially the circumferential fluctuation w f , is substantially enhanced, and the radial turbulence assumes highest value in the radial position -0.7 < r/R < 0.5. The magnitudes of Reynolds stresses -uw and -uv in our measurements are in the same level except in the lower portion of the tube where -uw assumes a value close to zero as is the case in single phase flow and vertical air-water bubbly flow.