水基碳管纳米流体制备及其热物性实验研究

Experimental Study on Preparation and Thermal Properties of Water-based Carbon Nanotubes Nanofluids

采用添加表面活性剂阿拉伯胶(GA)的方法制备碳管纳米流体,并对不同长径比以及经球磨、酸化处理的碳管纳米流体热物性进行了研究。通过透射电子显微镜和扫描电子显微镜观察表明,所制备的碳管纳米流体具有很好的分散性和稳定性。碳管纳米流体热物性实验结果表明,碳管的比表面积和直线度是碳管长径比影响纳米流体热导率的主要因素。碳管经球磨处理时,随球磨时间延长,碳管长径比和直线度先后对纳米流体热导率提升起主导作用,碳管酸化处理后,改善了其分散性并降低了接触热阻,这是纳米流体热导率提高的主要因素。但随着碳管酸化时间的延长,碳管长径比起主导作用。碳管纳米流体的粘度主要受碳管分散性和直线度的影响。

Gum arabic （GA） was used as surfactant prepare carbon nanotubes nanofluids,and the thermal pro- perties of carbon nanotubes nanofluids with different aspect ratio or treated by milling and acidification were studied. According to transmission electron microscopy and scanning electron microscopy research, the carbon nanotubes nanofluids had good dispersibility and stability. The experimental results of carbon nanotubes nanofluid thermal pro- perties showed that carbon nanotubes surface area and straightness were the main factors that affecting the thermal conductivity of nanofluids. With ball milling time extended, carbon nanotubes aspect ratio and straightness successively played a leading role in enhancing the thermal conductivity of nanofluids. The dispersion of carbon nanotubes improved and the eontaet thermal resistance reduced after aeidifieation, whieh was the main factor leading to the thermal conduc- tivity of nanofluids improved. But with the acidifieation time increased, the aspect ratio of carbon nanotubes played a leading role. Its viscosity was mainly affected by the carbon nanotubes dispersion and straightness.