Effect of Heat Spreading on the Performance of Heat Sink via Vapor Chamber

Numerical simulation of a heat sink embedded with a vapor chamber and calculation of effective thermal conductivity of a vapor chamber

“…The surface temperature distribution of the vapor chamber is more flattened than the conduction plates, as observed by Chen et al [24]. Therefore, the orthotropic approach will be a better way to present the heat-transfer behavior of the vapor chambers.…”

“…The simulations have been compared with the experimental results of Chen et al [19,24]. The watercopper vapor chamber used in this study has the outer size of 86 mm in length, 71 mm in width, and 5 mm in total thickness.…”

“…In the previous experiments by Chen et al [19,24], the input power varies from 30 to 60 W. By using a wind tunnel which provides a controllable air flow rate, the frontal air velocity entering the heat sink is kept at 3 m/s and the ambient temperature is controlled around 300 K. A heating copper block is placed beneath the vapor chamber to serve as a concentrated heat source. Three heater sizes are 10 Â 10 mm 2 , 20 Â 20 mm 2 and 40 Â 40 mm 2 , respectively.…”

“…From Borgmeyer and Ma's simulations [23], they found that a heat sink embedded with a flat heat pipe can achieve an effective thermal conductivity over 6000 W m À1 K À1 . Chen et al [19,24] presented experimental comparisons between the metal plates and a copper-water vapor chamber. The vapor chamber shows a lower thermal resistance and a more uniform surface temperature distribution.…”