Abstract
The experimental study for the flow characteristics in the square channels with a sharp 180-deg turn which frequently used as heat exchangers was conducted. PIV measurements were performed both in symmetry plane and in four cross-section planes after the turn at a Reynolds number of 2.0×(10)^4. Proper orthogonal decomposition (POD) which decomposing a field of a time-dependent variable into an orthogonal set of deterministic functions was demonstrated on the PIV snapshots to identify coherent structures in the flow. Based on the data, the unsteady flow characteristics in the channel with a sharp 180-deg turn are discussed.
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