Abstract
A series of experimental investigations with stringent measurement methods on the studies related to fluid flow and transient mixed convection from a horizontally unconfined stationary/rotating ceramic-based MCM disk with jet impingement have been successfully conducted. The relevant parameters influencing fluid flow and heat transfer performance are (1) mixed convection due to jet impingement and buoyancy － steady-state Grashof number, jet Reynolds number, and ratio of jet separation distance to nozzle diameter; and (2) mixed convection due to jet impingement, disk rotation and buoyancy － steady-state Grashof number, jet Reynolds number, rotational Reynolds number, ratio of jet separation distance to nozzle diameter. In the study, the fluid flow and transient heat transfer behavior on a stationary/rotating MCM disk surface with unconfined jet impingement has been systematically explored. It includes the jet velocity distribution, jet potential core, jet turbulence intensity distribution, transient temperature distribution on the MCM disk surface, transient heat flux distribution of input power, transient convective heat flux distribution of chips, and transient chip and average heat transfer characteristics on the MCM disk surface. Furthermore, two new correlations of transient stagnation and average Nusselt numbers in terms of, H/d and t are proposed for the cases of stationary MCM disk. A satisfactory agreement is achieved between the results predicted by this correlation and the experimental data during the transient period. For the cases of rotating MCM disk, a new empirical correlation to classify two regimes of heat transfer modes such as disk rotation mode and jet impingement mode is presented; and a complete composite correlation of steady-state average Nusselt number for mixed convection due to jet impingement, disk rotation and buoyancy is proposed.