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The flow patterns prediction of transition done by systematic work to the oil-water flow has been implemented in this article, which utilized several ranges of velocities of oil and water. The consideration conducted employed an acrylic rectangular horizontal smooth duct having a length of (3.6 m), a height of (5 cm), and a width of (2.5 cm). Twenty values of flow rates have been selected to compare with a previous study, which represent the various types of flow pattern that are expected to appear during the test. Three major flow regimes have been considered, including stratified, intermittent, and dispersed flow. A comparison with a previous study was obtained, the stratified flow and intermittent (ST and MI) were found in a same range with a wavy in some results, and the dual continuous flow (Do/w and w/o) occurred above (0.2) of the superficial velocity of kerosene, which were almost same. The dispersed oil in water and water results were manifested in the range of dispersed oil through water for a previous study. The results displayed that the cross-sectional area is very effective on the flow patterns, which it was sensitive on the transition of flow patterns. [ABSTRACT FROM AUTHOR]