轴流风扇冲击射流下泡沫铝热沉的换热特性

Open-Celled Aluminum Foam Heat Sinks for Electronics Cooling with Axial Fan Impinging Flow

针对电子元器件的冷却问题,实验研究了孔隙率为0.92、孔密度不同的3种通孔泡沫铝热沉在轴流风扇冲击射流下的换热特性.测量了表征热沉整体换热性能的热阻、表面温差等参数,并与传统翅片式热沉的相应结果进行了比较分析.结果表明:泡沫铝热沉能使加热模块表面温度的分布明显变得均匀,更有利于延长电子元器件的使用寿命,而且泡沫铝热沉可在保持整体换热性能与翅片式热沉相当的条件下,使散热装置的体积和质量均减少约50%.此外,结果也显示出泡沫铝热沉在电子元器件冷却应用上有进一步优化的潜质.

The heat transfer performance of open-celled aluminum foam heat sinks under axial fan impinging cooling flow is experimentally studied.Three open-celled aluminum foam samples with different pore sizes and identical porosity（ε=0.92） were tested.The overall thermal resistance and temperature difference on the base plate of the heat sink were measured and compared with those of the conventional plain-fin heat sink.The results obtained show that,with only 50% of the total volume and weight of the conventional fin heat sink,the aluminum foam heat sink can achieve a similar cooling performance and more uniform temperature distribution on the heated base plate.The aluminum foam heat sink has further potential for optimization in terms of foam thickness,pore density and porosity,leading to a further enhancement of its overall heat dissipation performance under axial fan impinging cooling for power electronics.