An Evaluation of Viscosity Models for the Prediction of the Two-phase Pressure Drop in Two-phase Flow Through A Circular Micro-channel

Sira Saisorn1, 2
and Somchai Wongwises2, 3
1 Department of Mechanical Engineering, King Mongkut’s Institute of
Technology Ladkrabang Chumphon Campus, Thailand
2 Fluid Mechanics, Thermal Engineering and Multiphase Flow Research Lab (FUTURE)
Department of Mechanical Engineering, King Mongkut’s University of
Technology Thonburi, Thailand
3 Fellow of the Royal Institute, Academy of Science


Adiabatic two-phase air-water flow experiments are conducted in this study. A fused silica channel, 120 mm long, with a diameter of 0.22 mm is used as the test section. The void fraction data obtained by image analysis correspond with the Amand-type correlation. The experimental frictional pressure drop data are compared with the homogeneous flow predictions. Several well-known twophase viscosity models are evaluated in order to address the appropriate methods among them for application to micro-channels.

Key words: two-phase flow, micro-channel, void fraction, pressure drop