Abstract
A column made of sintered powder is useful for improving the rigidity and enhancing the critical heat flux (CHF) of a vapor chamber (VC). In this work, a thermal hydraulic model was presented to analyze the performance of a VC with different sintered central columns (cen-columns). Based on the analyses of thermal performance, liquid/vapor velocity and gauge pressure drop distributions, the influences of the cen-column diameter on the performance of the VC were discussed. Selected suggestions were given for optimization of the powder radius and structural design of the cen-column for VCs. The results show that the sintered cen-column can provide auxiliary liquid circulation paths, and also provide additional heat conductive passages that affect the thermal resistances. A compound column (which is the combination of a solid pillar and a sintered ring in a coaxial arrangement) is effective in improving the cen-column VC performance, whose thermal resistance is 29.4% lower than that of the VC with pure sintered cen-column. We hope that our work is useful for structural optimization of VCs with sintered columns.
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