Afshin J. Ghajar and  Swanand M. Bhagwat,  Gas-Liquid Two Phase Flow Phenomenon in Near Horizontal Upward and Downward Inclined Pipe Orientations.   journal   = {International Journal of Mechanical and Mechatronics Engineering}, [online]. World Academy of Science, Engineering and Technology.
    May 2014, vol. 90(6). 1091 - 1105
    [viewed 21 January 2022]. Available from: https://publications.waset.org/pdf/9998413.