An experimental research was conducted to reveal effects of nanofluids on heat transfer performance in a double-tube heat exchanger. With nanoparticle weight fraction of 0.5%-2.0% and Reynolds number of 4500-14500, the flow resistance and heat transfer were analyzed by using six nanofluids, i.e., CuO-water, Al2O3-water, Fe3O4-water, ZnO-water, SiC-water, SiO2-water nanofluids. Results show that SiC-water nanofluid with a weight concentration of 1.5% provides the best improvement of heat transfer performance. 1.0% CuO-water and 0.5% SiO2-water nanofluids have lower friction factors in the range of Reynolds number from 4500 to 14500 compared to the other nanofluids. Based on test results of heat transfer performance and flow resistance, the 1.0% CuO-water nanofluid shows a great advantage due to a relatively high heat transfer performance and a low friction factor. Finally, empirical formulae of Nusselt numbers for various nanofluids were established based on experimental data tested in the double-tube heat exchanger.
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机译：进行了实验研究，揭示了纳米流体对双管热交换器中传热性能的影响。纳米颗粒重量分数为0.5％-2.0％，雷诺数为4500-14500，通过使用六个纳米流体，即CuO-水，Al 2 O 3水，Fe3O4-水，ZnO-水，SiC来分析流动性和传热。 - 水，SiO2水纳米流体。结果表明，重量浓度为1.5％的SiC-水纳米流体提供了热传递性能的最佳提高。与其他纳米流体相比，1.0％CuO水和0.5％SiO 2水纳米流体在4500至14500的雷诺数范围内具有较低的摩擦因子。基于传热性能和流动性的试验结果，1.0％Cuo-水纳米流体由于相对高的传热性能和低摩擦系数而显示出很大的优势。最后，基于在双管热交换器中测试的实验数据建立了各种纳米流体的营养数的经验公式。
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