Computational flow and heat transfer of a row of circular jets impinging on a concave surface

• Published in: Heat and mass transfer 2008-04, Vol.44 (6), p.667-678
• Main Authors: Kumar, B. V. N. Rama, Prasad, B. V. S. S. S.
• Format: Article
• Language: English
• Subjects: Applied sciences; Computational methods in fluid dynamics; Energy; Energy. Thermal use of fuels; Engineering; Engineering Thermodynamics; Engines and turbines; Equipments for energy generation and conversion: thermal, electrical, mechanical energy, etc; Exact sciences and technology; Fluid dynamics; Fundamental areas of phenomenology (including applications); Heat and Mass Transfer; Industrial Chemistry/Chemical Engineering; Original; Physics; Thermodynamics
• ISSN: 0947-7411; 1432-1181
• DOI: 10.1007/s00231-007-0274-3

A computational investigation is carried out to study the flow and heat transfer from a row of circular jets impinging on a concave surface. The computational domain simulates the impingement cooling zone of a gas turbine nozzle guide vane. The parameters, which are varied in the study include jet Reynolds number ( Re d  = 5000–67800), inter-jet distance to jet diameter ratio ( c / d  = 3.33 and 4.67) and target plate distance to jet diameter ratio ( H / d  = 1, 3 and 4). The flow field, predicted with K - ω turbulence model and using Fluent 6.2.16, is characterized with the presence of a pair of counter rotating vortices, an upwash fountain flow and entrainment. The local pressure coefficient and Nusselt number variations along the concave plate are presented and these values are found to under predict the available experimental data by about 12%.