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根据温度恒定时输入热量与输出热量相等的原理,提出了一种简单方便的测量热沉散热功率的方法,并搭建了实验台。通过测量输入电热丝中的电压、电流以及通电时间即可得到热沉的散热功率,并通过数理分析确定实验测量周期,以保证实验结果误差在5%以内。实验表明在热沉翅片根部开孔可以有效提高热沉散热功率,对测试所用热沉而言最高可提高16.3%。但随着开孔数量的增多,热沉的散热功率先上升达到一个极值后再下降。究其原因在于开孔增多的同时,减少了热沉内部热量自热沉底部向热沉顶部传递的面积,增加了热沉内部的传热阻力。
According to the principle that the input heat and the output heat are equal when the temperature is constant, a simple and convenient method to measure the heat dissipation capacity of the heat sink is proposed and a test bench is set up. By measuring the input electric wire in the voltage, current and power time to get the heat sink power, and through mathematical analysis to determine the experimental measurement period, in order to ensure that the experimental results of error within 5%. Experiments show that the heat sink fins open at the root of the root can effectively improve heat sink cooling power, heat sink used in the test can be increased by up to 16.3%. However, with the increase in the number of openings, heat sink power dissipation first rose to reach an extreme before declining. The reason is that while the number of openings increases, the heat transfer from the bottom of the heat sink to the top of the heat sink is reduced, and the heat transfer resistance inside the heat sink is increased.