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Characteristics of turbulent core-annular flows in a vertical pipe

Kiyoung Kim
Department of Mechanical & Aerospace Engineering Seoul National University Seoul 151-744, Korea

Haecheon Choi
Department of Mechanical & Aerospace Engineering Seoul National University 1, Gwanak-ro, Gwanak-gu, Seoul 08826, Korea

Abstrakt

The core-annular flow has been considered as a useful tool to effectively transport highly viscous oil by having lower viscous fluid such as water near the pipe surface. In the present study, we simulate turbulent coreannular flows by using a level-set method for tracking the phase interface between oil and water. A few different volume flow rate ratios are considered in a vertical pipe. Results show that the oil core region is nearly a plug flow and the water region is a turbulent flow. The phase interface between oil and water has waves with different wavenumbers and amplitudes which affect turbulent structures in water flow.