摘要
建立树状分形换热器通道内湍流流动和传热的三维模型,采用流、固耦合计算方法对入口水力直径为3.2 mm的矩形截面树状通道内流动与换热进行了数值模拟,获得了湍流状态下分形结构换热器内流体速度和温度分布、压力损失及换热器表面最大温差。在相同工况下,应用尼古拉兹半经验公式对通道内压损进行了理论验证。计算结果表明:分形树状通道结构在湍流状态下形成若干回流使其具有较强换热能力和较均匀温度分布,其换热器表面温差随入口雷诺数增大而减少,流体入口温度对换热器表面温差影响很小;随着入口雷诺数增大通道内压损是增加的,并且数值模拟结果与理论分析结果比较接近,说明采用文中数值模拟方法获得的结果准确可靠。
A three-dimensional steady model for turbulent flow and heat transfer in minichannel fractal tree-like heat sink is set up.Theturbulent flow and heat transfer processes in the rectangular section channel of the fractal tree-like heat sink with inlet hydraulic diameterwhich is3.2mm simulated by liquid-solid coupled method.The velocity and temperature distribution,the pressure drop and the maximumtemperature difference on the heat surface of the fractal-tree like heat sink under turbulent flow are presented.The Nigolas semi-empiricalformulas are used to verify the pressure drop under the same condition.The calculated results show that turbulent flow in the fractal-tree likeheat 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 isnegligible.The pressure drop increases with increasing of the inlet Reynolds number,and the data of pressure drop obtained by simulation issame as presenting in reference.It shows that the numerical simulation method used in this article can obtain more precisely result.
作者
孙健
谢敏倩
黄章锋
SUN Jian;XIE Minqian;HUANG Zhangfeng(Jingdezhen Ceramic Institute, Jingdezhen 333403, Jiangxi, China;Inventec group, Shanghai 201100,China)
出处
《陶瓷学报》
北大核心
2017年第4期574-579,共6页
Journal of Ceramics
