Fabrication and performance of capillary wick by paste printing and sintering
As an efficient two-phase flow heat transfer element,the structure and performance of the capillary wick in the vapor chamber affect the heat transfer efficiency.Screen-printing paste was used for capillary wick preparation in this study,and the capillary performance of the wick was investigated by inverse gravity capillary water absorption experiment and numerical calculation.The heat transfer performance of the vapor chamber made of capillary wicks with different capillary performance was tested.The results show that the capillary wick A formed by sintering paste A has the best capillary performance,the permeability is 6.944 ×10-14 m2 and the capillary force is 1.403 × 105 Pa.It can make the working liquid climb vertically against gravity by 98 mm in 10 s.The heat transfer performance of the vapor chamber made of capillary wick was tested with 5 W heating power,and the vapor chamber A had the lowest thermal resistance which has the best thermal conductivity and temperature uniformity.The capillary performance of the capillary wick is affected by the capillary pressure and permeability,and the capillary performance of the capillary wick is positively correlated with the heat transfer performance of the vapor chamber.In addition,the thickness of the capillary wick prepared by this method can be controlled at(0.20±0.02)mm.It is expected to realize the effect of highly efficient thermal conductivity and temperature uniformity in the limited space of the electronic device.
万方数据
维普
