Heat transfer and thermal behaviour of a rotating disk passed by a planar air stream

The aerodynamics of a thin, but finite, free rotating disk in an outer forced flow field with constant mean velocity parallel to the disk plane are investigated numerically. The heat transfer coefficients and their distributions on the isothermal disk surface are calculated for several velocities in case of air. Appropriate correlations are derived for the Nusselt number as function of the involved similarity numbers. The idealised model is faced also with the heat transfer problem of an actual motorbike disk brake. The transient heat conduction within rotating disks are treated analytically using the integral-transform technique. This enables even for heat sources which are very short in space a certain estimation of the azimuthal variations of the temperature field due to the rotation.