Thermal Performance of Vapor Chamber With Nanofluids

The paper describes experimental studies on the heat transfer performance of a wickless vapor chamber with a heat sink. A vapor chamber of 78 mm length and 64 mm width was fabricated with a thickness of 5 mm and tested for two different working fluids, copper-water and aluminium-water nanofluids with the filling ratio of 30% of the vapor chamber volume. As a baseline comparison de-ionized (DI) water is considered as a working fluid. The vapor chamber was tested for heat inputs ranging from 90 -150 W. The effects of heat input and metal concentration in the working fluids and the effect of particle deposition on the performance of the vapor chamber are presented. The thermal resistance of vapor chamber was decresed with the increase of the heat input for copper-water nanofluids while it remained constant for DIwater. Also the thermal resistance was found to be lower for higher concentration of the nanofluid.