In the present numerical simulation, laminar single‐phase and two‐phase nanofluid flows are investigated inside a rectangular microchannel with the vortex generators. Rhombic vortex generators with different attack angles are used for a better mixture of fluid. Water/MgO nanofluid is used as the working fluid in the volume fractions of nanoparticles φ = 0‐4% in Reynolds numbers of Re = 1‐300 at the two‐dimensional space. The presence of vortex generators with attack angles of λ = 0‐45°, and simultaneous investigation of heat transfer and flow hydrodynamic parameters distinguish this research from other similar studies. Obtained results revealed that using nanofluid with higher volume fractions, slip boundary condition on the hot wall, and using vortex generator with higher λ lead to significant enhancement of heat transfer. Also, the value of pressure drop augmentation is caused by the increase of φ and λ is significant at higher Reynolds numbers. Unlike the increase of φ, by increasing Reynolds number, the effect of slip boundary condition becomes considerable on the reduction of entropy generation. The behavior of entropy generation graphs with slip velocity boundary condition on the wall is different from the no‐slip boundary condition at Re = 300. The behavior of average entropy generation is different in the various φ, Reynolds numbers, and λ in the no‐slip boundary condition for single‐phase and two‐phase models. Also, the two‐phase model estimates flow behavior with less irreversibility.

中文翻译：

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使用菱形涡流发生器对矩形微通道内的水/MgO 纳米流体流动进行层流单相和两相建模

在目前的数值模拟中，使用涡流发生器研究了矩形微通道内的单相和两相纳米流体层流。采用具有不同攻角的菱形涡流发生器，可以更好地混合流体。以水/MgO纳米流体作为工作流体，纳米粒子的体积分数φ= 0‐4%（雷诺数）右二维空间中 e = 1‐300。存在攻角为的涡流发生器λ= 0-45°，并且同时研究传热和流动流体动力学参数，使该研究与其他类似研究区分开来。所得结果表明，使用体积分数较高的纳米流体、热壁上的滑移边界条件以及使用具有较高体积分数的涡流发生器λ导致传热显着增强。此外，压降增大的值是由φ和λ在较高的雷诺数下显着。与增加不同的是φ，通过增加雷诺数，滑移边界条件对减少熵产生的影响变得相当大。壁上有滑移速度边界条件的熵生成图的行为与无滑移边界条件不同右e = 300。平均熵生成的行为在不同的情况下是不同的φ，雷诺数，和λ单相和两相模型的无滑移边界条件。此外，两相模型估计流动行为的不可逆性较小。