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Due to investigate numerically and experimentally the effect particles diameter on pressure drop along vertical pipe of internal diameter of 1.25 inches and length of 2 meter. The mixture flow of three –phase is air –water –gasoil. This study performed for different temperature of water –phase 35Co, 40 Co, and 45 Co. Numerically, the volume of fluid (VOF) used as model to simulate the solution. Experimentally all experiments carried out of system design in laboratory. The results showed that pressure values along pipe depended on particles, it observed the particles of 2mm have a higher values comparison with 6mm and 10mm, because its depended on porosity .When increasing water-phase temperature, it observed that the pressure values increased because the natural of relationship between temperature and pressure .The deviation between the Numerical part and Experimental part is very good .The study have agreement with other studies. Keyword: Three–phase air –water –gasoil, VOF, Porosity, Temperature, Pressure

The Effect of Changing the Particles Diameter on Pressure Drop in Flow of Three-Phase (Air-Water-Gasoil)