Flow characteristics of 3-D turning diffuser using particle image velocimetry

Nordin , Normayati and Abdul Karim, Zainal Ambri and Othman, Safiah and Raghavan, Vijay R. and Mohideen Batcha, Mohd Faizal and Hariri, Azian and Basharie, Siti Mariam (2016) Flow characteristics of 3-D turning diffuser using particle image velocimetry. In: 7th International Conference on Mechanical and Manufacturing Engineering, 1 - 3 August 2016, Jogjakarta, Indonesia.

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Abstract

It is often necessary in fluid flow systems to simultaneously decelerate and turn the flow. This can be achieved by employing turning diffusers in the fluid flow systems. The flow through a turning diffuser is complex, apparently due to the expansion and inflexion introduced along the direction of flow. The flow characteristics of 3-D turning diffuser by means of varying inflow Reynolds number are presently investigated. The flow characteristics within the outlet cross-section and longitudinal section were examined respectively by the 3-D stereoscopic PIV and 2-D PIV. The flow uniformity is affected with the increase of inflow Reynolds number due to the dispersion of the core flow throughout the outlet cross-section. It becomes even worse with the presence of secondary flow, 22% to 27% of the mean outlet velocity. The flow separation takes place within the inner wall region at the point very close to the outlet edge and the secondary flow vortex occurs dominantly within half part of the outlet cross-section.

Item Type:Conference or Workshop Item (Paper)
Uncontrolled Keywords:turning diffuser; flow characteristics; particle image velocimetry (PIV)
Subjects:T Technology > TJ Mechanical engineering and machinery > TJ1-162 Mechanical engineering and machinery
Divisions:Faculty of Mechanical and Manufacturing Engineering > Department of Energy and Thermofluid Engineering
ID Code:8326
Deposited By:Mrs. Normayati Nordin
Deposited On:21 Sep 2016 16:39
Last Modified:21 Sep 2016 16:39

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