In this study, we present a numerical simulation of MWCNT-Fe₃O₄/water hybrid nanofluid forced convection heat transfer over the forward- and backward-facing steps channel having a baffle fixed on its top wall. A FORTRAN’s homemade code based the lattice Boltzmann method (LBM) is used here. The effects of the Reynolds number (25 $\le$ Re $\le$ 100), the volume fraction of nanoparticles (0 $\le$ $\varphi$ $\le$ 0.003), the position of baffle (3 $\le$ ${\mathit{X}}_2$ $\le$ 7), the length of baffle (0 $\le$h $\le$ 1.5) and the geometry parameter (2 $\le$ ${\mathit{X}}_1$ $\le$ 4) on flow pattern and heat transfer characteristics are provided a deep insight. The results indicate that the average Nusselt number is an increasing function of Re and $\varphi$. The baffle has a significant effect on the flow pattern and heat transfer characteristics. When the length of the baffle increases, the recirculation region behind the backward-facing step shrinks. The average Nusselt number increases by increasing the length of the baffle or moving the baffle towards the backward-facing step.

在这项研究中，我们提供了一个数值模拟的MWCNT-Fe ₃ O ₄ /水混合纳米流体强迫对流传热的前向和后向台阶通道，其顶壁固定有挡板。这里使用基于格子Boltzmann方法（LBM）的FORTRAN自制代码。雷诺数的影响（25$\le$ 回覆 $\le$ 100），纳米粒子的体积分数（0 $\le$ $\varphi$ $\le$ 0.003），挡板位置（3 $\le$ ${\mathit{X}}_2$ $\le$ 7），挡板长度（0 $\le$H $\le$ 1.5）和几何参数（2 $\le$ ${\mathit{X}}_{\mathrm{1个}}$ $\le$4）对流型和传热特性提供了深刻的认识。结果表明，平均Nusselt数是Re和Re的增加函数。$\varphi$。挡板对流型和传热特性有重大影响。当挡板的长度增加时，向后台阶后面的再循环区域缩小。通过增加挡板的长度或将挡板移向后向步骤，可以增加平均Nusselt数。