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1 Zeszyty Naukowe. Cieplne Maszyny Przepływowe - Turbomachinery / Politechnika Łódzka

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The „Poor man” MicroPIV – Adaptation of particle image velocimetry for microscale measurements

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Domagalski P. , Karczemska A. , Witkowski D. , Tomczyk M. , Pawlak R.

2014

tom nr 145

35--36

Particle Image Velocimetry (PIV) is a well-established measurement technique in area of fluid mechanics [1]. Its main idea is monitoring the displacement of tracer particles over time to obtain the flow’s velocity field. Although the technique is very flexible and widely used, it cannot be applied for flows in geometries of characteristic dimensions of order of millimeters or micrometers, which is often desired e.g. for visualization of the flow field between the centrifugal pump impeller and volute, in case of wall-slip flows in rheological investigations or generally in microfluidics area. In such scales the direct application of PIV is impossible due to technological issues: used in PIV lightning system – a light sheet used for slicing the investigated area will not work due to near-wall reflections, optical elements limited laser damage threshold and align problems. Therefore the light delivery system has to be completely redesigned, but as the other system components, data acquisition system and light source remain untouched, the adaptation of PIV system is possible in form of micro PIV [2,3]. In current work we would like to test the possibility of building such an adapter, aiming for costs minimization, therefore we decide to reduce the microPIV system, using the breadboard-mounted set of opto-mechanical elements instead of using fluorescent microscope.