Influence of Expansion Ratio on the Size of Recirculation Zone in Two-Phase Sudden Expansion Flows,
Abstract
The paper presents measurements of the reattachment length and of the axial velocity component in a descending turbulent axisymmetric sudden expansion flow, for three expansion ratios of 1:2, 1:3 and 1:4. The measurements have been performed with a standard laser Doppler anemometer, first in the single-phase flow and then repeated for the fluid and particles in the two-phase flow cases by eliminating from the raw Doppler signals each time one of the two burst populations. For the two-phase flows the measured reattachments lengths were 6-10% shorter than for the corresponding single-phase cases. Fort particle volumetric concentrations up to 0.027, the axial mean velocities and normal stresses were not affected as the concentration was increased. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 23, 1992
- Accession Number
- ADP009036
Entities
People
- G. Papaioannides
- M. Founti