This article describes an arc-submerged nanofluid synthesis system (ASNSS) using ultrasonic orthogonal vibration that was developed to fabricate Co/Ag nanocompound fluid. In the fabrication process, the positive electrode of an Ag rod and the ultrasonic vibrator are combined to form an orthogonal model with the negative electrode of a Co rod. The two electrodes are then installed inside the vacuum chamber, with deionized water as the dielectric liquid. This nanocompound fluid is analyzed by morphological analysis, heat transfer analysis, magnetism analysis and suspension stability. The experimental results show that the nanocompound fluid is composed of Co, Ag and Co3O 4, and the mean particle size is 30 nm. The pH value of the prepared nanocompound fluid is 3.8, and the Zeta potential is 31 mV, so the prepared nanofluid has excellent suspension stability. For the heat transfer experiment, the experimental ambient temperature is 40 °C, weight concentration is 0.4%, and average heat transfer coefficient is 0.79 W/m °C. The magnetism test shows that the saturation magnetization of the produced Co/Ag nanocompound fluid is 5.213 emu/g, the saturation magnetic strength is 6666.93 Oe, the coercivity is 56.62 Oe and the remanent magnetization is 0.0945 emu/g.
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