Affiliations: Graduate School of Mechanical Engineering, Yonsei
University, Seodaemun-ku Shinchon-dong 134, Seoul 120-749, The Republic of
Korea | School of Mechanical Engineering, Yonsei University,
Seoul, The Republic of Korea. E-mail: [email protected] | Department of Mechanical and Information Engineering,
Korea Maritime University, Pusan, The Republic of Korea
Abstract: Transitional air flow patterns at the mid-plane of gap between
co-rotating disks in a stationary cylindrical enclosure are visualized under
the acceleration condition of disks. The flow visualization is performed using
olive oil particles with a laser sheet and CCD camera. On disk spinning-up, the
transition flow patterns are clearly observed. The affect of magnitude of
acceleration on the onset of transition and the relations of the number of
vortex cells in fully turbulent regime of the flow in an outer region of the
flow field to the rotating speed are also investigated. The centrifugal effect
of particle is evaluated from the comparison with visualization results using
hollow glass spheres.