5. Stationary Disk in Air Stream

No general solution for the three-dimensional flow field is known for an inclined disk with finite radius R subjected to streams of air. In their pioneering papers on parallel rotating disks subjected to air streams, Dennis et al. [1] and Booth and de Vere [2] recognized how important the effect of flow separation at the rim of the blunt disk is for flow and heat transfer behavior. In general, the angle of attack (i.e., the inclination) of the disk β represents a third major parameter in addition to rotational and translational Reynolds numbers Re _ω and Re _u . Furthermore, the disk thickness ratio d/R is also relevant for the occurrence of flow separation and reattachment of a turbulent boundary. It is therefore useful to organize the following discussion into two separate chapters: a discussion of the phenomena involved in a stationary disk (Chap. 5) followed by an extension to rotating disks (Chap. 6) based on the results for stationary disks.