Thermal performance of a hybrid pulsed nanofluid flow in a channel with obstacles formed using a dual MRT–LBM approach

IF 5.6 3区工程技术 Q2 ENERGY & FUELS

Thermal Science and Engineering Progress Pub Date : 2026-03-01 Epub Date: 2026-02-13 DOI:10.1016/j.tsep.2026.104578

Abdelilah Makaoui, Mohammed Amine Moussaoui, Ahmed Mezrhab

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Abstract

The multiple relaxation time lattice Boltzmann method (MRT-LBM) was used to study the flow of a pulsating hybrid nanofluid of copper and aluminium (Cu–Al₂O₃) and water containing two internal obstacles inside a heated microchannel. The effects of the Reynolds number (Re), Strouhal number (St), total nanoparticle volume fraction (φ), copper mixing ratio, and obstacle shape (rectangular vs. trapezoidal) were determined using the mean Nusselt number (Nu), friction factor (f), and performance evaluation criterion (PEC). Increases in φ and copper ratio enhanced effective heat transfer, resulting in an increase in Nū. Under identical operating conditions, this reached a maximum of 28% compared to water for φ = 4% and 75% copper. The inlet pulse produced a non-uniform response, with the optimal result occurring near St ≈ 0.8. Within this region, the periodic disturbance of the boundary layer and the regeneration of the thermal fluid near the wall were more effective. Increasing St led to a further decrease in net gain due to phase lag and incomplete thermal redevelopment within the cycle. Replacing the rectangular obstacle with a trapezoidal obstacles suppresses stagnation recirculation and promotes smoother reattachment. This improves the hydrodynamic thermal equilibrium, resulting in a maximum PEC≈1.35. These results provide design guidelines for the coordinated selection of hybrid configuration, pulse frequency, and barrier shape in microchannel heat sinks.

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混合脉冲纳米流体在双MRT-LBM方法形成障碍通道中的热性能

采用多重弛豫时间晶格玻尔兹曼方法（MRT-LBM）研究了铜铝（Cu-Al2O3）和水在加热微通道内的脉动混合纳米流体的流动。采用平均努塞尔数（Nu）、摩擦系数(f)和性能评价标准（PEC）确定了雷诺数（Re）、斯特罗哈尔数（St）、总纳米颗粒体积分数（φ）、铜混合比和障碍物形状（矩形与阶梯）的影响。φ和铜比的增大增大了有效换热，导致nhi增大。在相同的操作条件下，与φ = 4%和铜含量为75%的水相比，这一比例最高可达28%。进口脉冲产生非均匀响应，最佳结果出现在St≈0.8附近。在该区域内，边界层的周期性扰动和壁面附近热流体的再生更为有效。由于相位滞后和循环内热再开发不完全，St的增加导致净增益进一步降低。用梯形障碍物代替矩形障碍物抑制滞止再循环，促进更平滑的再附着。这改善了流体动力热平衡，导致最大PEC≈1.35。这些结果为微通道散热器的混合结构、脉冲频率和势垒形状的协调选择提供了设计指导。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Thermal Science and Engineering Progress Chemical Engineering-Fluid Flow and Transfer Processes

CiteScore

7.20

自引率

10.40%

发文量

327

审稿时长

41 days

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