Heat Transfer Characteristics for a Confined Rotating MCM Disk With Round Jet Array Impingement

An effective method of design of experiments combined with Central Composite Design for exploring the heat transfer characteristics for a confined rotating Multi-Chip Module (MCM) disk with round jet array impingement has been successfully developed. The relevant parameters influencing heat transfer performance include the steady-state Grashof number (Gr_s), ratio of jet separation distance to nozzle diameter (H/d), jet Reynolds number (Re_j) and rotational Reynolds number (Re_r). Their effects on heat transfer characteristics have been systematically explored. An axisymmetrical temperature distribution is ensured for various Gr_s, Re_j, Re_r and H/d ratios. As compared with the mutual effects of jet array impingement and disk rotation cause a more non-uniform distribution of chip temperatures. For heat transfer behavior, a new correlation of stagnation Nusselt number for jet array impingement at r/R = 0 in terms of Re_j and H/d is presented. As compared with the experimental steady-state data of single round jet impingement, the average heat transfer enhancement at stagnation point r/R = 0 of jet array impingement is 607%. For the rotating MCM disk cases, the highest chip heat transfer occurs at the MCM disk rim, and decreases sharply along the distance from the surface edge toward the surface center.