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The Journal of the Royal Institute of Thailand Volume II - 2010 An Evaluation of Viscosity Models for the Prediction of the Two-phase Pressure Drop in Two-phase Flow through a Circular Micro-channel 78 4. Conclusion Two-phase air-water flow is carried out in a channel with a diameter of 0.22 mm which is made of fused silica. Void fraction data are obtained based on image analysis. The void fraction is in a linear relationship with volumetric quality. The two-phase frictional pressure drop data are obtained by subtracting the accelerational term and the sudden contraction component from the total pressure droop. The capability of several well-known two-phase viscosity models for predicting pressure drop in the present channel is analyzed by comparing their predictions with experimental results. Acknowledgements The authors would like to express their appreciation to the Thailand Research Fund (TRF) for providing financial support for this study. References Abdelall FF, Hahn G, Ghiaasiaan SM, Abdel-Khalik SI, Jeter SS, Yoda M, Sadowski DL, 2005. Pressure drop caused by abrupt flow area changes in small Channels. Exp. Therm. Fluid Sci, 29: 425-434. Beattie DRH, Whalley PB, 1982. A simple two-phase flow frictional pressure drop calculation method. Int. J. Multiphase Flow, 8: 83-87. Chung PM-Y, Kawaji M, 2004. The effect of channel diameter on adiabatic two- phase flow characteristics in microchannels. Int. J. Multiphase Flow, 30: 735- 761. Cicchitti A, Lombardi C, Silvestri M, Solddaini G, Zavalluilli R, 1990. Two-phase cooling experiments-Pressure drop, heat transfer and burnout measurement. Energ. Nucl, 7: 407-425. Figure 6 Experimental data vs. predicted pressure drop with Beattie and Whalley model [15].