纳米流体在热管中的换热特性实验研究

Experimental Study on Heat Transfer Characteristics of Nanofluids in Heat Pipes

在分析热管散热原理的基础上自制一套CPU热管散热系统,研究在不同纳米流体浓度下热管散热性能的变化情况。通过实验比较和分析,得到热管的最佳纳米流体浓度,从而最大限度地提高热管的实际散热能力。通过实验制备出CuO-水纳米流体,将其作为热管工质,建立一套热管换热性能的测试实验装置,使用装置并对热管进行换热性能测试。实验的各种参数:充液率为50%;纳米流体质量分数(ω)分别为1%、1.2%、1.4%。并与以水为工质的热管进行换热性能的对比,通过对不同CuO纳米颗粒浓度的CuO-水纳米流体热管实验结果分析发现:热管内CuO-水纳米流体的热传输具有一定的特殊性,通过多组实验掌握这种特殊性的规律,可以在一定条件下使得纳米流体在热管中起到强化传热的作用。

Based on the analysis of heat pipe heat dissipation principle, a set of CPU heat pipe heat dissipation system is designed to study the change of heat pipe heat dissipation performance under different nanofluid concentrations. Through experimental comparison and analysis, the optimal nanofluid concentration of heat pipe is obtained so as to maximize the actual heat dissipation capacity of heat pipe. CuO-water nanofluids were prepared by experiments and used as the working fluid of heat pipe. A set of heat pipe heat transfer performance test device was established and the heat transfer performance of the heat pipe was tested.The parameters of the experiment are as follows: filling rate 50%;Nanofluid mass fraction(ω) respectively 1%, 1.2%, 1.4%. The heat transfer performance of heat pipe with water as working fluid was compared. Through the analysis of the experimental results of CuO-water nanofluid heat pipes with different concentrations of CuO nanoparticles, it is found that the heat transfer of CuO-water nanofluid in the heat pipe has certain particularity. Through multiple sets of experiments, it can be mastered that this particularity can make the nanofluid play a role in strengthening heat transfer in the heat pipe under certain conditions.