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Introduction of Particle Image Velocimetry - UMD

Introduction of Particle Image VelocimetrySlides largely generated by J. Westerweel & C. Poelma of Technical University of DelftAdapted by K. KigerKen KigerBurgers Program For Fluid DynamicsTurbulence SchoolCollege Park, Maryland, May 24-27 IntroductionParticle Image Velocimetry (PIV):Imaging of tracer particles , calculate displacement: local fluid velocityTwin Nd:YAGlaserCCD cameraLight sheetopticsFrame 1: t = t0 Frame 2: t= t0+ tMeasurementsectionIntroductionParticle Image Velocimetry (PIV)99210043232 divide Image pair ininterrogation regions small region:~ uniform motion compute displacement repeat !!!IntroductionParticle Image Velocimetry (PIV):Instantaneous measurement of 2 components in a planeconventional methods(HWA, LDV) single-point measurement traversing of flow domain time consuming only turbulence statisticszparticle Image Velocimetry whole-field method non-intrusive (seeding instantaneous flow fieldIntroductionParticle Image Velocimetry (PIV):Instantaneous measurement of 2 components in a planeparticle Image Velocimetry whole-field method non-intrusive (seeding instantaneous flow fieldinstantaneous vorticity fieldExample: coherent structuresExample: coherent structuresTurbulent pipe flowRe= 5300100 85 vectors hairpin vortexExample: coher))

random fluctuations correlation due to displacement peak: mean displacement. Influence of NI N I = 5 N I = 10 N I = 25 ... Spurious vectors Three main causes:-insufficient particle-image pairs-in-plane loss-of-pairs, out-of-plane loss-of-pairs-gradients. Effect of tracer density NNN

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