选用乙二醇(EG)为基液,运用两步法制得稳定性良好的γ-Fe_2O_3纳米流体.测量并研究了γ-Fe_2O_3纳米流体的导热系数和粘度等热输运性质.结果表明,γ-Fe_2O_3纳米粒子的加入使得纳米流体的导热系数较基液提高了,纳米流体的粘度在低温下较大,并随着温度的升高而减小,纳米流体在强化传热领域有着潜在的应用前景.
Nanofluids containing γ-Fe_2O_3 nanoparticles are prepared using a two-step method with the ethylene glycol (EG) as the base fluid.The thermal transport properties including the thermal conductivity (TC) and the viscosity of the nanofluids are measured.The experimental results show that the TC increases with the addition of γ-Fe_2O_3 nanoparticles.The viscosity of the nanofluid has a higher value at lower temperature As the temperature increases,the viscosity appears decreasing tendency.It is indicated that nanofluids have a potential application prospect in the field of heat transfer enhancement.
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