SUN Jian 1, XIE Minqian 1, HUANG Zhangfeng 2
(1.Jingdezhen Ceramic Institute, Jingdezhen 333403, Jiangxi, China; 2.Inventec group, Shanghai 201100,China)
Abstract: A three-dimensional steady model for turbulent flow and heat transfer in minichannel fractal tree-like heat sink is set up. The turbulent flow and heat transfer processes in the rectangular section channel of the fractal tree-like heat sink with inlet hydraulic diameter which is 3.2 mm simulated by liquid-solid coupled method. The velocity and temperature distribution, the pressure drop and the maximum temperature difference on the heat surface of the fractal-tree like heat sink under turbulent flow are presented. The Nigolas semi-empirical formulas are used to verify the pressure drop under the same condition. The calculated results show that turbulent flow in the fractal-tree like heat sink cause several secondary flow which makes temperature distribution more uniformity. With increasing of the inlet Reynolds number,the maximum temperature difference of the heat sink decreases. The effect of inlet temperature of fluid on the maximum temperature is negligible. The pressure drop increases with increasing of the inlet Reynolds number, and the data of pressure drop obtained by simulation is same as presenting in reference. It shows that the numerical simulation method used in this article can obtain more precisely result.
Key words: Turbulence; Numerical study; Fractal heat sink; RNG k- ε equation