进出口方式和槽道形状对微散热器内流量分配与传热的影响

为得到散热效果比较好的等截面矩形微散热器,设计了不同的进出口布置方式和不同的进出口槽道形状,并采用数值模拟的方法对微散热器内流量分配和传热特性进行了研究.结果表明进出口布置方式对微散热器内通道流量分配有很大影响:进出口槽道形状为矩形的微散热器流体流动分布较好;三角形槽道微散热器流体流动分布相对较差,其流动机理可归结为分流与摩擦阻力的相互作用;I型矩形槽道微散热器无论是传热性能还是流阻特性均优于C型及Z型微散热器,具有优越的强化传热特性,能满足高热流密度的微电子器件的冷却需求.

Effect of Inlet/Outlet Types and Header Design on the Flow Distribution and Heat Transfer in a Micro Heat Radiator

Different inlet / outlet types and header designs were proposed for the conventional rectangular microchannel heat radiator to obtain the optimal geometric parameters and their effects on the flow distribution and heat transfer were numerically studied. Results show that different inlet / outlet types have great impact on the characteristics of flow distribution for the micro heat radiator. Results highlight that flow distribution is relatively better for rectangular header and relatively poor flow distribution for the triangular header,and the fluid flow mechanism can be attributed to the interaction of the branching of fluid and the friction offered by the walls of the header. Type I with rectangular header is better than other cases at both fluid flow and heat transfer characteristics. It can improve the heat transfer performance and meet the demand of high heat flux cooling of microelectronic devices.