Design Of Array Jet Impingement Cooling Structural Inside Cold Plate And Study On Its Heat Transfer Characteristics

To improve computer’s performance, CPU has been developing in thedirection of high frequency, integration and miniaturization. But the high heatflux produced by this has become a major obstacle to further development ofCPU. Liquid jet impingement cooling can produce extremely high convectiveheat transfer coefficient in local space, so it is considered to be one of the mosteffective technology to solve the high heat flux problem. However, there aresome structure problems that the size in the jet direction is too large and it iseasy to seal when this technology is used in the application of cooling electronicdevices. In addition, as the heat transfer mechanism for liquid jet impingementcooling is complex, there are not yet a complete theoretical system. Therefore,this paper proposed a novel liquid jet impingement cooling structure, analysisedthe influence of different experimental factors on the heat transfer characteristicsof this structure, explored its heat transfer mechanism and determined itsrelative optimum combination of structural parameters through experiments andsimulation.Designed an array jet impingement cooling structure in the cold platethrough fusing jet impingement cooling structure and cold plate structural whichis commonly used in liquid cooling technology. Determined the structuralparameters of the cold plate reasonably according to the method of equallyspaced interval and variable spacing between interval and the results of jetvelocity and jet resistance. Then designed the cold plate hierarchically accordingto principles of reducing clogging and leaking.Designed a experimental system that comprises fluid circulation subsystem,analog chip heating subsystem and data collection subsystem. The experimentalsystem is used to study the influence of different factors on the convective heattransfer capability and resistance of array jet impingement cooling structure.Then designed a reasonable method of experimental data processing based onthe physical quantity collected by the experimental system.Verified that the jet structure can greatly improve the thermal performanceof cold plate, discovered the law of influence of jet aperture, jet distance, jetspeed and thermal power on convective heat transfer capability and resistance ofthis structure, explored the reason of that why the influence was produced anddetermined the relative optimal structure parameters of jet structure through theanalysis of the experimental results. Determined the relative optimum turbulence model, obtained distribution ofcold plate temperature, water pressure and convective heat transfer coefficient aswell as changes of cold temperature and water pressure in the jet direction,explored the reason of that why the distribution and changes happen and studiedthe heat transfer theory of jet structure as well as the mechanism for theinfluence of jet distance on heat transfer characteristics of jet structure from theinside of the jet structure through analyzing the simulation results andcomparing with the experimental results.