Single phase liquid immersion cooling of discrete heat sources in a vertical channel.
Hazard, Sherrill John III.
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Natural convection liquid cooling of simulated electronic components was investigated. A single column of eight protruding components was constructed using foil heaters mounted on the back of stainless steel rectangular blocks. These components were attached to a vertical plexiglas wall to simulate a column of 20 pin DIP'S. A channel was formed by placing a smooth movable shrouding wall parallel to the test surface. The test surface and the shrouding wall were placed in a water immersion bath. Flow visualization was accomplished using a laser generated plane of light to illuminate suspended particles. Photographs were taken of the flow at the test surface mid-plane for four different power settings at each of three different channel widths. A nondimensional temperature and a modified Grashof number for each heated protrusion at each input power setting and channel width were determined. Visual results indicate two distinct flow regions. Far away from the components, a natural convection boundary layer flow was observed. Near the components, the flow was modified by the protrusions. As the component heat input increased, more pronounced three dimensional effects were noticed. Temperature measurements indicate that as the modified Grashof numbers increased, the nondimensional temperatures decreased for each component. Also, the difference in the nondimensional temperatures for various components decreased with increasing modified Grashof numbers.
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