Abstr:Combining/dividing flow in Y junction

Application Area 3: Chemical & Process, Thermal Hydraulics & Nuclear Safety

Application Challenge AC3-10

Abstract

This application challenge focuses on the prediction of pressure losses and head loss coefficients for water flowing in a Y-junction. A series of tests has been carried out under both convergent and divergent flow conditions, and at various splits of flow in the two minor branches. The flow rates used in the major branch covered an approximate Reynolds number range of 5x105 to 1.2x106.

The Y-junction has an included angle of 50 degrees between the two minor branches, and the internal geometry has been optimised.

Flow behaviour in pipe junctions is relevant to many industrial applications. At certain flow rate ratios the pressures in the Y-junction give rise to ‘negative’ differential pressures. CFD can provide an insight into the reasons behind this.

In this application challenge the design or assessment parameters (DOAPs), are the differential pressures between the legs of the Y-junction.

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Contributors: Alan Stevens - Rolls-Royce Marine Power, Engineering & Technology Division