Numerical study of convective heat transfer of nanofluids in a circular tube two-phase model versus single-phase model
Numerical study of convective heat transfer of nanofluids in a circular tube two-phase model versus single-phase model
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DOI：
10.1016/j.icheatmasstransfer.2009.08.003
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发表时间：
2010-01-01
影响因子：
7
通讯作者：
Talaie, M. R.
中科院分区：
文献类型：
--
作者：
Fard, M. Haghshenas;Esfahany, M. Nasr;Talaie, M. R.
采用CFD1方法对恒壁温条件下纳米流体在圆管内的层流对流换热进行了数值研究。单相和两相模型已被用于预测温度、流场和计算纳米粒子源等重要参数对换热系数的影响。考察了纳米颗粒体积分数和纳米流体Peclet数对换热系数的影响，并与基于两相模型的CFD模拟结果进行了比较。理论模型和实验数据表明，换热系数随颗粒浓度的增大而明显增大，且强化换热随Peclet数的增大而增大。两相模型与实验测量结果吻合较好。对于浓度为02%的铜/水纳米流体，基于单相模型的实验数据与CFD结果的平均相对误差为16%，而对于两相模型的平均相对误差为8%。基于模拟的结果，两相方法比单相模型(C)2009 Elsevier Ltd.版权所有
Laminar convective heat transfer of nanofluids in a circular tube under constant wall temperature condition is studied numerically using a CFD1 approach. Single-phase and two-phase models have been used for prediction of temperature, flow field, and calculation of heat transfer coefficient Effects of some important parameters such as nanoparticle sources. nanoparticle volume fraction and nanofluid Peclet number on heat transfer rate have been investigated The results of CFD simulation based on two-phase model were used for comparison with single-phase model. theoretical models and experimental data Results have shown that heat transfer coefficient clearly increases with an increase in particle concentration Also the heat transfer enhancement increases with Peclet number. Two-phase model shows better agreement with experimental measurements. For Cu/Water nanofluid with 0 2% concentration, the average relative error between experimental data and CFD results based on single-phase model was 16% while for two-phase model was 8% Based on the results of the simulation it was concluded that the two-phase approach gives better predictions for heat transfer rate compared to the single-phase model (C) 2009 Elsevier Ltd All rights reserved