Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
4994869 | International Journal of Multiphase Flow | 2017 | 10 Pages |
Abstract
An optical method is developed for a 2.95 mm inner diameter circular mini-channel to estimate liquid film thicknesses. The greyscale pictures obtained with a high-speed camera are processed to determine the liquid-vapour interface positions for annular and intermittent flows. The experiments are thus performed for a large range of flow conditions. The saturation temperatures tested ranged from 20°C to 100°C in steps of 10°C and the mass velocities are 50, 100, 200, 300 and 400 kg mâ2 sâ1. A new parameter ranging from 0 to 1, the symmetry, is defined to account for the level of non uniformity of liquid distribution around the tube perimeter. New experimental data are presented (270 data points), that cover a range of symmetry parameter from 0.35 to 1.00. These data are merged with those available in the literature (406 data points with symmetry parameter from 0.71 to 1.00). A sensitivity analysis of the dimensionless numbers of major influence is run and a new correlation is proposed, that enables to predict over 90% of the data points in an error bandwidth of 10%. This correlation is proposed as criterion for asymmetry.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Fluid Flow and Transfer Processes
Authors
Thibaut Layssac, Claudia Capo, Stéphane Lips, Alfonso William Mauro, Rémi Revellin,