You Xiangcheng, Li Shiyuan
College of Petroleum Engineering, China University of Petroleum-Beijing, Beijing 102249, China.
Nanomaterials (Basel). 2021 Apr 25;11(5):1107. doi: 10.3390/nano11051107.
This paper studies the convective heat transfer of a hybrid nanofluid in the inclined channel, whose walls are both heated by the uniform heat flux. The governing ordinary differential equations are made nondimensional and solved analytically, in which explicit distributions of velocity, temperature and pressure are obtained. The effects of flow reversal, wall skin friction and Nusselt number with the hybrid nanofluid depend on the nanoparticle volume fractions and pressure parameters. The obtained results indicate that the nanoparticle volume fractions play a key role in delaying the occurrence of the flow reversal. The hybrid nanofluids hold more delayed range than conventional nanofluids, which is about 2.5 times that of nanofluids. The calculations have been compared with the base fluid, nanofluid and two kinds of hybrid models (type II and type III). The hybrid model of type III is useful and simplified in that it omits the nonlinear terms due to the interaction of different nanoparticle volumetric fractions, with the relative error less than 3%. More results are discussed in the results section below.
本文研究了倾斜通道中混合纳米流体的对流换热，该通道的壁面均由均匀热流加热。将控制常微分方程无量纲化并进行解析求解，得到了速度、温度和压力的显式分布。混合纳米流体的流动反转、壁面皮肤摩擦和努塞尔数的影响取决于纳米颗粒体积分数和压力参数。所得结果表明，纳米颗粒体积分数在延迟流动反转的发生中起关键作用。混合纳米流体比传统纳米流体具有更大的延迟范围，约为纳米流体的2.5倍。计算结果已与基础流体、纳米流体和两种混合模型（II型和III型）进行了比较。III型混合模型是有用且简化的，因为它忽略了由于不同纳米颗粒体积分数相互作用而产生的非线性项，相对误差小于3%。更多结果将在下面的结果部分进行讨论。
