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The dynamic particle image velocimetry (PIV) is consisted of a high frequency pulse laser, high speed cameras and a timing controller. This high speed camera is able to capture 1k×1k pixels images at 2 kHz and 512×512 pixels images at 6 kHz. The three velocity components of flow downstream of an axial flow fan for PC cooling system are measured using the stereoscopic dynamic PIV system. An axial flow fan has seven blades of 72 mm in diameter. The rotating speed is 1800 rpm. The downstream flow is visualized by particles of about 0.3-1μm in diameter. The three-dimensional instantaneous velocity fields are measured at several downstream planes. The effect of the support of hub on axial velocity component is recognized by the instantaneous and time-mean vector maps.

Flow Measurement of a PC Fan Using a Dynamic PIV