Enhanced Heat Transfer by Modified Nano-carbon Powder in Mirabilite-based Nanofluid
ZHANG Yu1, TIE Shengnian1,*, WANG Chang'an1,2
1 Key Laboratory of Advanced Materials and Applied Technology for Qinghai Province, Qinghai University,Xining 810016, China 2 School of Materials, Tsinghua University, Beijing 100084, China
Abstract: The modified nano-carbon powder containing hydrophilic groups was prepared by utilizing the nano-carbon powder as raw material and the concentrated acid, ammonia and ethanol as modifiers. Then, the nano-carbon powder mirabilite-based nano fluid was obtained through a two-step strategy. The test results indicate that the surface of the modified nano-carbon powder contains hydrophilic groups as compared with the unmodified material, which ensures the stable dispersion in the Glauber's salt-based nanofluid. In addition, it is found that the lower the temperature of Glauber's salt-based nanofluid, the higher the sensitivity of viscosity to volume fraction changes. In contrast, the lower the volume fraction of nano-carbon powder, the lower the sensitivity of viscosity to temperature changes. As a result, the thermal conductivity of the mirabilite-based phase-change material increased by 11.93% on average after adding the 0.25vol% modified nano-carbon powder under 40 ℃. The H-C model revealed that the dispersion stability of the modified nano-carbon powder in mirabilite-based nanofluid is better than that of the unmodified sample.
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2022, Vol. 36 
