Simulation of copper–water nanofluid in a microchannel in slip flow regime using the lattice Boltzmann method with heat flux boundary condition
Simulation of copper–water nanofluid in a microchannel in slip flow regime using the lattice Boltzmann method with heat flux boundary condition
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DOI：
10.1088/1742-6596/655/1/012029
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发表时间：
2015-11
期刊：
影响因子：
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通讯作者：
A. D'Orazio;Z. Nikkhah;A. Karimipour
中科院分区：
文献类型：
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作者：
A. D'Orazio;Z. Nikkhah;A. Karimipour
采用双粒子群热格子Boltzmann方法（TLBM）研究了水-铜纳米流体在微通道内的层流强迫对流换热。与微通道壁相比，进入流处于较低的温度。微通道的中间部分被加热与恒定的和均匀的热通量，通过逆滑移热能边界条件模拟。对于等于0.00%、0.02%和0.04%的纳米颗粒体积分数以及等于0.001、0.01和0.1的滑移系数进行模拟。雷诺数分别为1、10和50。给出了流线、等温线、努塞尔数和滑移速度的纵向变化以及不同截面的速度和温度分布。结果表明，LBM可以用于模拟纳米流体微尺度流动的强迫对流。他们表明，在较高的雷诺数值的微通道执行更好的传热。对于本研究中考虑的所有雷诺数值，平均努塞尔数略有增加，固体体积分数的增加和滑移系数的增加。雷诺数越高，这种增加的速率越显著。
Laminar forced convection heat transfer of water-Cu nanofluids in a microchannel is studied using the double population Thermal Lattice Boltzmann method (TLBM). The entering flow is at a lower temperature compared to the microchannel walls. The middle section of the microchannel is heated with a constant and uniform heat flux, simulated by means of the counter slip thermal energy boundary condition. Simulations are performed for nanoparticle volume fractions equal to 0.00%, 0.02% and 0.04% and slip coefficient equal to 0.001, 0.01 and 0.1. Reynolds number is equal to 1, 10 and 50.The model predictions are found to be in good agreement with earlier studies. Streamlines, isotherms, longitudinal variations of Nusselt number and slip velocity as well as velocity and temperature profiles for different cross sections are presented. The results indicate that LBM can be used to simulate forced convection for the nanofluid micro flows. They show that the microchannel performs better heat transfers at higher values of the Reynolds number. For all values of the Reynolds considered in this study, the average Nusselt number increases slightly as the solid volume fraction increases and the slip coefficient increases. The rate of this increase is more significant at higher values of the Reynolds number.