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本文提出预测纳米流体热导率的通用模型,该模型可以预测含球形纳米颗粒的纳米流体或含纳米管的纳米流体的热导率。模型首先计算纳米粉体团聚体的热导率与团聚体在流体中的体积分数,进而计算得到纳米流体的热导率。将通用模型的预测结果、已有纳米流体热导率模型的预测结果与实验数据进行比较,结果表明97%的通用模型预测结果与实验数据的误差在10%以内,平均误差为2.8%。通用模型的精度超过已有的纳米流体热导率模型,且具有很好的通用性。
In this paper, a general model for predicting the thermal conductivity of nanofluids is proposed, which predicts the thermal conductivity of nanofluids with spherical nanoparticles or nanotube-containing nanofluids. The model first calculates the thermal conductivity of agglomerates and the volume fraction of aggregates in the fluid, and then calculates the thermal conductivity of the nanofluids. The results of the general model prediction and the prediction of the existing nanofluid thermal conductivity model are compared with the experimental data. The results show that the error between the prediction of 97% general model and the experimental data is within 10% and the average error is 2.8%. The accuracy of the universal model exceeds that of the existing nanofluid thermal conductivity model and has good versatility.