Computation of laminar flow and heat transfer over an enclosed rotating disk with and without jet impingement

The study examines a laminar flow field in the cavity of an enclosed rotating disk and accompanying local heat transfer coefficients on the rotating disk surface enclosed by a stationary shroud, including situations designed to provide a better understanding of the interactions between a rotating flow and an impinging jet. Two cases are modeled. The first is cavity flow without jet impingement, and the second introduces an impinging jet imposed as the source inside the cavity. In the former case, the flow patterns obtained correspond to those categorized as 'laminar flow, separate boundary layers' in the experimental results by Daily and Nece (1960). The effect of the cavity rim is limited to a very small radial extent, and the flow pattern near the rotating disk is similar to the free disk similarity solution of von Karman (1921). In the latter case, the transition from one regime to the other is found to occur when the mass flow ratio is approximately equal to 0.2-0.3 for the base source jet configuration.