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3722 |
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Friday, May 23, 2014, Hall A 12:20 PM Process Diagnostics, Sensors & Controls |
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Development of velocity measurement methods for cold sprayed particle clusters using particle image velocimetry techniques |
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Kazunori Sakata* / FUJIKIKOSAN CORPORATION, JAPAN Hiroshi Katanoda / Kagoshima University, Japan Toshikazu Nanbu/ NISSAN MOTOR CO., LTD., Japan Kazuhiko Takashima/ NISSAN MOTOR CO., LTD., Japan Masashi Yasuki/ SEIKA CORPORATION, Japan Hiroyasu Sasaki/ nac Image Technology Inc., Japan |
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In order to elucidate the coating mechanism of the low-pressure cold spray equipment, we report the results obtained from a high shutter speed camera and particle image velocimetry (PIV) measurement technique. Ni and WC-Co powders with particle sizes in the order of 10 µm were used as feedstock materials. Using a camera with a high shutter speed, single shots with an exposure time of 10 ns were taken to measure the particle size. Multiple exposure shots with a 500 ns time interval were taken to directly measure the velocity of the particles. A particle of 16 µm in size was measured traveling at 619 m/s. Through PIV using a double-pulse laser and a high-resolution camera, the velocity distribution of a particle cluster was obtained. Typical PIV set-ups record images at 1 µs to 1 ms time intervals. Our set-up recorded images just 100 ns apart, allowing particles velocities of up to 1200 m/s to be recorded. The mean flight velocities of Ni and WC-Co particles were 772 m/s and 823 m/s, respectively. |