The main objective of this paper is to investigate parameters of heat transfer and fluid flow of Ag-water nanofluid through a ribbed rectangular channel in the presence of a magnetic field. The walls of the channel are exposed to constant heat flux. The study is carried out at four different Reynolds numbers (10 < Re < 500). Also, the Hartmann numbers and nanofluid volume fractions are changed in the range of 0–200 and 0–0.04, respectively. The effect of variation of Reynolds numbers, Hartmann numbers, and nanofluid volume fraction is analyzed on the local Nusselt number, average Nusselt number, entropy generation, and profiles of velocity. The result indicated that there is a critical Reynolds number that leads to minimum entropy generation at all volume fractions of nanoparticles and Hartmann numbers. At higher Hartmann numbers, velocity profiles become flattened, and the heat transfer increased. Thermal performance is approximately enhanced three times with the Reynolds number increase. At high Reynolds numbers, magnetic field force is caused the total entropy generation rate's increase to five times. But at low Reynolds numbers, magnetic field force has not sensible effect on total entropy generation rate.

本文的主要目的是研究在磁场存在的情况下，Ag-水纳米流体通过肋状矩形通道的传热和流体流动参数。通道壁暴露于恒定的热通量。该研究在四种不同的雷诺数 (10 < Re < 500) 下进行。此外，哈特曼数和纳米流体体积分数分别在 0-200 和 0-0.04 的范围内变化。分析了雷诺数、哈特曼数和纳米流体体积分数的变化对局部努塞尔数、平均努塞尔数、熵生成和速度分布的影响。结果表明，存在导致在所有体积分数的纳米颗粒和哈特曼数下产生最小熵的临界雷诺数。在更高的哈特曼数下，速度分布变平，传热增加。随着雷诺数的增加，热性能大约提高了三倍。在高雷诺数下，磁场力导致总熵产生率增加到五倍。但在低雷诺数下，磁场力对总熵产生率没有明显影响。