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以水/乙二醇混合液为基液,加入Al_2O_3,MgO和ZnO纳米颗粒配制得到纳米流体。在自制对流传热性能测试平台上进行基液及纳米流体传热性能的测试。结果表明:同基液相比,随流体流速增大,Al_2O_3纳米流体的传热系数变化不明显,MgO和ZnO纳米流体的传热系数均有提高。层流状态下,随雷诺数增大,三种纳米流体的传热系数都不断增大。当雷诺数为1400时,MgO纳米流体传热系数提高最大,达到了244.0%。良好的强化传热性能,使得氧化物纳米流体今后有望应用在发动机冷却系统中。
Water / glycol mixture as the base fluid, adding Al 2 O 3, MgO and ZnO nanoparticles prepared nanofluids. The self-made convection heat transfer performance testing platform for liquid and nano-fluid heat transfer performance testing. The results show that the heat transfer coefficient of Al 2 O 3 nanofluids does not change significantly with the increase of the fluid velocity, and the heat transfer coefficients of both MgO and ZnO nanofluids increase compared with the base liquid. With the increase of Reynolds number, the heat transfer coefficients of the three kinds of nanofluids are all increasing under the laminar flow condition. When the Reynolds number is 1400, the heat transfer coefficient of MgO nanofluids increases maximally to 244.0%. Good heat transfer performance, making the oxide nanofluids is expected to be applied to the engine cooling system in the future.