Abstract
An indirect method to identify the laminar to turbulent flow transition in shear-driven annular liquid films has been developed and used, together with literature measurements of the velocity profile, to approximately resolve the near wall structure in shear-driven annular liquid films. The limits between the laminar sublayer and the buffer layer and between the buffer layer and the turbulent layer have been found to correspond to about 9 and 40 wall units, respectively, which are higher than the corresponding limits of 5 and 30 wall units typical of single-phase boundary layers, thus indicating a weaker turbulence intensity in shear-driven annular liquid films with respect to single-phase wall-bounded flows. Additionally, a simple laminar to turbulent flow transition criterion and a prediction method for the average liquid film thickness have been developed for evaporation and condensation applications.
| Original language | English |
|---|---|
| Pages (from-to) | 26-38 |
| Number of pages | 12 |
| Journal | International Journal of Multiphase Flow |
| Volume | 75 |
| DOIs | |
| Publication status | Published - 1 Oct 2015 |
Keywords
- Laminar to turbulent flow transition
- Annular two-phase flow
- Shear-driven liquid film
- Thin liquid film
- Turbulence emergence
- Laminarization