6 August 2014 Flow visualization of a non-contact transport device by Coanda effect
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Proceedings Volume 9232, International Conference on Optical Particle Characterization (OPC 2014); 92320O (2014) https://doi.org/10.1117/12.2064523
Event: International Conference on Optical Particle Characterization (OPC 2014), 2014, Tokyo, Japan
Abstract
AIST proposes new technology of non-contact transport device utilizing Coanda effect. A proposed non-contact transport device has a cylindrical body and circular slit for air. The air flow around non-contact device is turbulent and its flow pattern depends on the injection condition. Therefore we tried visualization of the air flow around non -contact device as the first step of PIV measurement. Several tracer particles were tried such as TiO2 particles, water droplets, potatoes starch, rice starch, corn starch. Hot-wire anemometer is employed to velocity measurement. TiO2 particles deposit inside of a slit and clogging of a slit occurs frequently. Potato starch particles do not clog a slit but they are too heavy to trace slow flow area. Water droplets by ultrasonic atomization also deposit inside of slit but they are useful to visualize flow pattern around a non-contact transport device by being supplied from circumference. Coanda effect of proposed non-contact transport device was confirmed and injected air flow pattern switches by a work. Air flow around non-contact trance port device is turbulent and its velocity range is wide. Therefore flow measurement by tracer part icle has traceability issue. Suitable tracer and exposure condition depends on target area.
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Norihiko Iki, Norihiko Iki, Hiroyuki Abe, Hiroyuki Abe, Takashi Okada, Takashi Okada, } "Flow visualization of a non-contact transport device by Coanda effect", Proc. SPIE 9232, International Conference on Optical Particle Characterization (OPC 2014), 92320O (6 August 2014); doi: 10.1117/12.2064523; https://doi.org/10.1117/12.2064523
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