Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Entrained Air Flow Characteristics due to the Powder Jet [Translated]†
We experimentally and numerically examine the flow characteristics of powder jet and entrained air. A phase-Doppler anemometer is used for the measurement of axial velocity profiles of particle and entrained air. It is found that the axial velocity profile of the entrained air takes a maximum at the center-line and decreases toward outer edge. A flow region of the entrained air extends transversely into a particle free region. The center-line velocity of entrained air at first increases with increasing distance from the orifice outlet and then decreases after it remains a plateau. The transverse dispersion of the entrained air is very small as compared with that of a single-phase turbulent jet. The numerical simulation is performed based on the Lagrangian modeling for particles and Eulerian modeling for air flow. We consider particle-particle collision, gravity force, drag force and transverse force due to the particle spin and to the velocity gradient of airflow, and apply a k-ε model. The present simulation qualitatively explains our measurement in terms of velocity profiles and dispersion ofparticle and air.† This report was originally printed in J. Soc. Powder Technology, Japan. 37(3), 160-167 (2000) in Japanese, before being translated into English by KONA Editorial Committee with the permission of the editorial committee of the Soc. Powder Technology, Japan.
Entrained Air Flow Characteristics due to the Powder Jet [Translated]†
We experimentally and numerically examine the flow characteristics of powder jet and entrained air. A phase-Doppler anemometer is used for the measurement of axial velocity profiles of particle and entrained air. It is found that the axial velocity profile of the entrained air takes a maximum at the center-line and decreases toward outer edge. A flow region of the entrained air extends transversely into a particle free region. The center-line velocity of entrained air at first increases with increasing distance from the orifice outlet and then decreases after it remains a plateau. The transverse dispersion of the entrained air is very small as compared with that of a single-phase turbulent jet. The numerical simulation is performed based on the Lagrangian modeling for particles and Eulerian modeling for air flow. We consider particle-particle collision, gravity force, drag force and transverse force due to the particle spin and to the velocity gradient of airflow, and apply a k-ε model. The present simulation qualitatively explains our measurement in terms of velocity profiles and dispersion ofparticle and air.† This report was originally printed in J. Soc. Powder Technology, Japan. 37(3), 160-167 (2000) in Japanese, before being translated into English by KONA Editorial Committee with the permission of the editorial committee of the Soc. Powder Technology, Japan.
Entrained Air Flow Characteristics due to the Powder Jet [Translated]†
Koichiro Ogata (Autor:in) / Katsuya Funatsu (Autor:in) / Yuji Tomita (Autor:in)
2014
Aufsatz (Zeitschrift)
Elektronische Ressource
Unbekannt
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