1. Abdulkadir, M., Hernandez-Perez, V., Sharaf, S., Lowndes, I. S., & Azzopardi, B. J. (2010). Experimental investigation of phase distributions of two-phase air–silicone oil flow in a vertical pipe. World Academy of Science, Engineering and Technology, 37, 52–59.
2. Bendiksen, K. H. (1984). An experimental investigation of the motion of long bubbles in inclined tubes. International Journal of Multiphase Flow, 10, 467–483.
3. Bhagwat, S. M., & Ghajar, A. J. (2014). A flow pattern independent drift flux model based void fraction correlation for a wide range of gas-liquid two-phase flow. International Journal of Multiphase Flow, 59, 186–205.
4. Bowers, C. D., & Hrnjak, P. S. (2010). Determination of void fraction in separated two-phase flows using optical techniques, international refrigeration and air-conditioning conference (pp. 2293–2302). Purdue University.
5. Chen, X. T., Cai, X. D., & Brill, J. P. (1997). Gas liquid stratified wavy flow in horizontal pipelines. Journal of Energy Resources Technology, 119, 209–216.