The present investigation is mainly concerned with experimental studies on the basic hydrodynamic characteristics of an oblique plunging liquid jet impinging on a liquid surface and resulting in air entrainment. To study the structure of a biphasic zone below the free surface of liquid, a needle type electrical conductivity probe has been indigenously designed and extensively used. For effective visualization of a two-phase flow field, a high-speed digital camera was utilized. With the aid of the above, the present study provides new methods and application of the phase detection probe to understand the physics of the plunging jet aeration system. This work, apart from the air entrainment characteristics, also investigates the geometry of the biphasic zone for the oblique plunging liquid jet. The experimental results were also compared with the existing correlations and are found to be in good agreement. Hence, this work contributes to the better understanding of the air entrainment process and bubble dispersion for the oblique plunging liquid jet system.
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