CPU散热器散热效果分析

对平直型散热器在顶送风和侧送风进行了数值模拟,结果表明顶送风温度场左右对称,而侧送风入口温度较低、出口温度较高,固体区域温度比侧送风时整体降低了10℃左右,强化了散热器散热。因此对于不均匀热源应在基板上尽量分开布置,功率密度前密后疏型布置可以有效降低基板温度。要根据流场和温度场的耦合关系来设计散热器的形状,充分利用流场。可以增加风扇风速或充分利用风扇出口处高速区域,来增加散热器的换热系数从而降低热阻。

Analysis of effect thermal discharge CPU radiator

Numerical simulation was carryed out for the liner radiator from top and side air supply.The result revealed that temperature field of top air supply was full of symmetry,however inlet temperature of the side air supply was low and outlet temperature was higher,and the solid region temperature is reduced about 10℃ than that of side air supply.So heat transfer of the radiator was enhanced.Hence heat source was separately arrangemented.Substrate temperature was effectly reduced when power density was layed front dense and back sparse.The shape of the radiator was designed according to couple relation of the flow field and temperature field,which could take full advantage of flow field and raise fan wind speed,so that increase heat transfer efficient and bring down thermal resistance.