September 2007

Piping/Modeling

Modeling two-phase flow in horizontal pipe bends

New calculations of pressure loss and predictions of flow pattern in bends

Ghaemi, A., Kasiri, N., Motamedian, E., Iran University of Science and Technology

In this research, the influences of horizontal 90° and 180° bends on the two-phase pressure loss and flow pattern for air-water mixtures inside a 2.4-cm smooth pipe are investigated. Based on experimental pressure loss data in bends, a prediction model is proposed. Comparing the new model with previous models in the literature shows that this model provides a better estimate of pressure loss in bends. Several experiments are also accomplished to observe the flow pattern in the presence of bends. In the region of flow, the flow pattern in the recovery region is temporarily turned into annular flow. Based on the present visualization, two flow pattern maps are proposed to describe th

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