Application: Assessment of the design parameters and the hydraulic performance of double entry drum screens and band screens.

Customer: Brackett Green Ltd

Service: Physical and Computational Fluid Dynamics (CFD) modelling.

Problem: BHRSolutions assisted Brackett Green in the process of optimising its design procedures for double entry drum screens. While existing procedures ensured that drum screens have met quoted performance specifications, it was felt there may be scope to improve some areas of design, to reduce size and hence costs of materials and construction.

Objectives: Optimisation of design parameters and improvement in hydraulic performance of drum screens and band screens, leading to a reduction in structure dimensions and associated costs.

Approach: BHRSolutions initially provided consultancy to assess the design procedures and underlying assumptions in the design process. This identified those areas which were most sensitive to modification and optimisation. Following a review of relevant published literature, recommendations were made for further examination of the sensitive areas. Velocities through the mesh, flow distribution through the screen and velocities on approach to and underneath the drum were key areas proposed for further investigation. These issues were addressed in a combined programme of work on both a physical and a CFD model.

Outcome/Benefits: Results from the modelling work led to modification of the detail design of the approach to the drum screen to improve flow conditions and minimise losses. Existing Bracket Green design procedures were validated and an appreciation gained of the effects on performance and head loss of exceeding design velocities. An understanding of the behaviour of the screenings and their impact on flow distribution was also obtained.

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