Development of Combined Particle Image Velocimetry and Particle Image Thermography for Air Flows

Schmeling, Daniel; Czapp, Marek; Bosbach, Johannes; Wagner, Claus

doi:10.1115/ihtc14-22774

Cited by 2 publications

(2 citation statements)

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“…While in previous studies, particle generation based on the Rayleigh instability [28], which potentially provides some of the above mentioned requirements, was employed [19], two different generators have been tested. One is based on an air-atomizing nozzle (0.25 mm nozzle diameter, liquid nozzle: PF1050, air nozzle: PA64, ©Spraying Systems) and the other one is an airbrush system (0.3 mm nozzle diameter).…”

Section: Generation Of Tracer Particlesmentioning

confidence: 99%

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Simultaneous measurement of temperature and velocity fields in convective air flows

Schmeling

Bosbach

Wagner

2014

Meas. Sci. Technol.

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Thermal convective air flows are of great relevance in fundamental studies and technical applications such as heat exchangers or indoor ventilation. Since these kinds of flow are driven by temperature gradients, simultaneous measurements of instantaneous velocity and temperature fields are highly desirable. A possible solution is the combination of particle image velocimetry (PIV) and particle image thermography (PIT) using thermochromic liquid crystals (TLCs) as tracer particles. While combined PIV and PIT is already state of the art for measurements in liquids, this is not yet the case for gas flows. In this study we address the adaptation of the measuring technique to gaseous fluids with respect to the generation of the tracer particles, the particle illumination and the image filtering process. Results of the simultaneous PIV/PIT stemming from application to a fluid system with continuous air exchange are presented. The measurements were conducted in a cuboidal convection sample with air in- and outlet at a Rayleigh number Ra ≈ 9.0 × 107. They prove the feasibility of the method by providing absolute and relative temperature accuracies of σT = 0.19 K and σΔT = 0.06 K, respectively. Further open issues that have to be addressed in order to mature the technique are identified.

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Section: Generation Of Tracer Particlesmentioning

confidence: 99%

“…The feasibility of combined PIT and PIV for pure thermal convection has already been demonstrated in a cubical Rayleigh-Bénard cell with air as the working fluid [18,19]. In these measurements the TLC tracer particles were sprayed into the cubical cell which was closed after the particle injection.…”

Section: Introductionmentioning

confidence: 99%