Heat transfer performance assessment of hybrid nanofluids in a parallel channel under identical pumping power
Heat transfer performance assessment of hybrid nanofluids in a parallel channel under identical pumping power
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相同泵浦功率下并行通道中混合纳米流体的传热性能评估
DOI：
10.1016/j.ces.2017.04.045
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发表时间：
2017-08
影响因子：
4.7
通讯作者：
Ting Qiu
中科院分区：
文献类型：
--
作者：
Chen Yang;Xiaowei Wu;Yongkun Zheng;Ting Qiu
在研究中，考虑了纳米粒子的迁移，建立了纳米混合流体的数学模型，该模型对纳米流体的热物理性质有重要影响。为了研究纳米混合流体在流道中的换热和摩擦因数特性，采用Runge-Kutta-Gill方法求解相应的控制方程。采用性能评价准则(PEC)评价了相同泵浦功率下杂化纳米流体的换热性能。讨论了氧化铝-二氧化钛/水纳米流体和氧化铝-氧化锆/水纳米流体两种杂化纳米流体。结果表明，氧化铝-二氧化钛/水纳米流体比氧化铝-氧化钛/水纳米流体具有更高的努塞尔数和更低的摩擦因数。此外，还发现随着两种单颗粒纳米流体体积分数的变化，氧化铝-二氧化钛/水纳米流体的PEC值最大，证明在相同的泵浦功率下，氧化铝-二氧化钛/水纳米流体的换热性能优于氧化铝/水纳米流体或二氧化钛/水纳米流体。研究了氧化铝-二氧化钛/水纳米流体的N-BT1和N-BT2变化对努塞尔数和摩擦因数的影响。值得注意的是，当N-BT1/N-BT2约为6时，PEC值在N-BT2变化下最小，而在N-BT1/N-BT2约为0.5时，PEC值在N-BT1变化下出现最大值。
In the study, a mathematical model of hybrid nanofluids was established with the consideration of nanoparticles migration, which has significant influence on the thermophysical properties of hybrid nanofluids. In order to investigate heat transfer and friction factor characteristics of hybrid nanofluids in a channel, the corresponding governing equations were solved by using the Runge-Kutta-Gill method. A Performance Evaluation Criteria (PEC) was used to assess heat transfer performance of hybrid nanofluids under identical pumping power. Two hybrid nanofluids, which are alumina-titania/water nanofluid and alumina-zirconia/water nanofluid, respectively, were discussed. The results clearly indicated that alumina-titania/water nanofluid exhibits higher Nusselt number and lower friction factor than alumina-zirconia/water nanofluid. Moreover, it has been found that with the variation of volume fraction ratio of two single-particle nanofluids, maximum PEC values of alumina-titania/water nanofluid were observed, proving that alumina-titania/water nanofluid has better heat transfer performance than either alumina/water nanofluid or titania/water nanofluid under identical pumping power. The effects of N BT 1 variation and N BT 2 variation of alumina-titania/water nanofluid on Nusselt number and friction factor were also investigated. It is interesting to note that minimum PEC values were observed under the variation of N BT 2 whenN BT 1/N BT 2 is approximately 6. However, maximum PEC values were observed under the variation of N BT 1 when N BT 1/N BT 2 is approximately 0.5.
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