Numerical analysis on heat transfer and flow characteristics of cooper microchannels heat sink with reentrant cavities

In view of the thermal control problem of high power LED arrays, a copper microchannels heat sink with reentrant cavities (" Ω "-shaped) was proposed. And the method of numerical simulation was adopted to analyze the performance of both the proposed heat sink and the common rectangular micro-channel heat sink. In addition, its single-phase convective heat transfer and flowing properties were also studied under different flow velocity, import water temperature and heat flux density. The results show that it can obtain higher integrated performance by reducing the pump power loss. And higher water velocity and lower water temperature can be used to improve the heat transfer performance and increase the temperature uniformity of the heat sink surface, so as to obtain longer service life and higher stability of the LEDs. Moreover, the Reynolds number of flow pattern transition is about 300.