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Secondary flow vortices and flow separation of 2-D turning diffuser via particle image velocimetry

Nordin, N. and Seri, S. M. and Taib, I. and Mohammed, A. N. and Abdullah, M. K. and Sapit, A. (2017) Secondary flow vortices and flow separation of 2-D turning diffuser via particle image velocimetry. In: International Research and Innovation Summit (IRIS2017), 6-7 May 2017, Kings Green Hotel, Malaysia.

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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. In the present work, the flow characteristics of 2-D turning diffuser by means of varying inflow Reynolds number are 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 presences of secondary flow of 22% to 28%. The secondary flow vortices occur almost the same scale at both left and right sides of the outlet. The flow separation takes place within the inner wall region early on half of the inner wall length and is gradually resolved with the increase of inflow Reynolds number.

Item Type: Conference or Workshop Item (Paper)
Subjects: Q Science > QC Physics
Divisions: Faculty of Mechanical and Manufacturing Engineering > Department of Energy and Thermofluid Engineering
Depositing User: Mr. Mohammad Shaifulrip Ithnin
Date Deposited: 13 Aug 2018 03:17
Last Modified: 13 Aug 2018 03:17
URI: http://eprints.uthm.edu.my/id/eprint/9655
Statistic Details: View Download Statistic

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