Simultaneous Visualization of Velocity and Temperature Fields of Transient Natural Convection

A new visualization technique to measure transient 2-D profiles of velocity and temperature was developed. Particle tracking yelocimetry (PTV) and real time holographic interferometry (HI) are combined into the new technique, and it will be called as HI-PV HIPV's accuracy depends on the clarity...

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Veröffentlicht in:Journal of heat transfer 2005-08, Vol.127 (8), p.800-800
Hauptverfasser: Nakane, Ichiro, Narumi, Akira, Fukuda, Kentaro
Format: Artikel
Sprache:eng
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Zusammenfassung:A new visualization technique to measure transient 2-D profiles of velocity and temperature was developed. Particle tracking yelocimetry (PTV) and real time holographic interferometry (HI) are combined into the new technique, and it will be called as HI-PV HIPV's accuracy depends on the clarity of separation of PTV and HI images. We propose two different techniques to separate PTV and HI images: (1) separate two images using a digital image processing after recording the superimposed image with a digital video camera and (2) record the two images separately by two digital video cameras attached with blue or red color filter. HI-PV was applied to the transient natural convection of water around two cooling tubes. Water: initial temperature = 13 deg C was cooled by two tandem cooling tubes: surface temperature = -4.3 deg C, and natural convection with density inversion occurs. A numerical calculation was also made and its results were favorably compared to the corresponding visualized results by HI-PV HI-PV is proven to be a very useful technique to measure simultaneously transient 2-D profiles of velocity and temperature.
ISSN:0022-1481
1528-8943
DOI:10.1115/1.2033307