Abstract
A series of experimental studies on the heat transfer characteristics of a confined ceramic-based MCM disk using various cooling techniques have been performed. Three types of cooling method such as (1) mixed convection due to disk rotation and buoyancy; (2) mixed convection due to water jet impingement and buoyancy; and (3) mixed convection due to disk rotation, water jet impingement and buoyancy are investigated in the present study. The relevant parameters influencing heat transfer performance for the above-mentioned cooling methods are listed, respectively. They are: (1) mixed convection due to disk rotation and buoyancy －Grashof number, ratio of the confinement spacing to disk diameter and rotational Reynolds number; (2) mixed convection due to water jet impingement and buoyancy － Grashof number, ratio of jet separation distance to nozzle diameter and jet Reynolds number; and (3) mixed convection due to water jet impingement, disk rotation and buoyancy － Grashof number, ratio of jet separation distance to nozzle diameter, rotational Reynolds number, and jet Reynolds number . In the present study, the heat transfer characteristics including the chip temperature distribution, local chip Nusselt numbers, and average Nusselt number on the MCM disk under different methods of convection have been investigated; and all relevant parametric effects on heat transfer behavior have also been explored. Besides, new correlations of chip and average Nusselt numbers in terms of relevant parameters are presented for three types of cooling conditions. Furthermore, for quantitatively evaluating the mutual influences among buoyancy, disk rotation and jet impingement on the heat transfer performance of the confined MCM disk, a new composite correlation for all the cases of confined rotating MCM disk with water jet impingement, disk rotation and buoyancy effects has been proposed. Comparisons between the predictions evaluated by this correlation and all the experimental data presented in the present research are made with a satisfactory agreement.