Particle Image Velocimetry and Heat Transfer Measurements of a Disk at High Rotational Speeds

Abstract Flow field and local heat transfer measurements were conducted on a rotating disk in an open environment for a variety of rotational speeds ranging from 1500 to 5500 rpm. Two-dimensional particle image velocimetry (PIV) measurements were conducted on the flow field above the surface of the rotating disk. Experiments were made on a rotating disk twice as large as a computer hard disk drive and therefore, the flow conditions may be comparable with a computer disk rotating with a speed up to 20,000 rpm. Velocity field, local heat transfer, and temperature distribution are presented as the result of this investigation. Transient liquid crystal technique was employed for heat transfer measurements, while a back calculation scheme was used to obtain the temperature distributions. Heat transfer measurements were made for r/R > 0.4 which excludes the central hub holding the disk assembly. Results reveals that heat transfer increases with a smaller slope near the corner of the hub, while it increases sharply near the outside edge of the disk

Flow and heat transfer for gas flowing in microchannels: A review

10.1007/s002310100247Heat and Mass Transfer/Waerme- und Stoffuebertragung384-5359-367HMTR