The current paper provides a three-dimensional computational analysis of hybrid nanofluid enhanced heat transfer in cross flow micro heat exchanger with rectangular wavy channels. This micro heat exchanger is assumed to be well insulated from its surrounding and made respectively of five top and five bottom channels. The hot and cold nanofluids flow through the upper and lower cross channels, respectively. This analytical investigation has been carried out using the finite element method with a wide range of governing parameters such as the flow velocity (5 mm/s ≤ u ≤ 100 mm/s), the wave number (0 ≤ N ≤ 20) and the nanoparticles concentration (0 ≤ ϕ ≤ 0.05). It was concluded that an adequate choice of flow velocity and nanoparticles volume fraction can minimize the heat exchanger size and the addition of nanoparticles has significant effect only with high velocities (u ≥ 50 mm/s). Moreover, it was revealed that a trade-off between the relevant controlling parameters is required to ensure an optimal efficiency. The highest heat exchanger efficiency was achieved with a wave number N = 8, a nanoparticles concentration ϕ = 0.05 and an inlet velocity u = 50 mm/s.

本文提供了具有矩形波浪通道的错流微热交换器中混合纳米流体增强传热的三维计算分析。假定该微型热交换器与其周围环境良好隔离，并分别由五个顶部和五个底部通道组成。热和冷的纳米流体分别流过上部和下部交叉通道。该分析研究是使用有限元方法进行的，其控制参数范围很广，例如流速（5 mm / s≤u≤100 mm / s），波数（0≤N≤20）和纳米粒子浓度（0≤ϕ≤0.05）。得出的结论是流速和纳米颗粒体积分数的适当选择可以最小化热交换器尺寸和添加纳米颗粒具有显著作用只与高的速度（U＆GreaterEqual;50毫米/ S）。此外，还揭示了需要在相关控制参数之间进行权衡以确保最佳效率。在波数N = 8，纳米颗粒浓度ϕ = 0.05和入口速度u = 50 mm / s的情况下，实现了最高的热交换器效率。