Experimental investigation of the critical Reynolds number for bubbly two-phase flow Academic Article uri icon


  • The critical Reynolds number for dispersed bubbly two-phase flows, gas in liquid, was experimentally investigated. In this experiment, the gas was air and the liquid was water. Water flowed upward through a vertical, translucent pipe, and air was introduced into the water prior to the test section by means of a basswood microbubbler. Dye was injected into the water to indicate when the flow transitioned from laminar to turbulent. Mixtures with gas volume fractions up to 10% were tested, and the Reynolds numbers for which the flow transitioned from laminar to turbulent were recorded. The data showed that the critical Reynolds number fell to roughly one-half of its original single-phase liquid value once the gas volume fractions exceeded 0.1%. These results indicate that the presence of even small amounts of bubbles causes pre-mature transition to turbulence.

published proceedings

  • INCAS Bulletin

author list (cited authors)

  • MCCRAY, M. C., & CIZMAS, P.

complete list of authors

  • MCCRAY, Marshall C||CIZMAS, Paul GA

publication date

  • September 2023