Abstract The double-diffusive tangent hyperbolic nanofluid containing motile gyrotactic microorganisms and magnetohydrodynamics past a stretching sheet is examined. By adopting the scaling group of transformation, the governing equations of motion are transformed into a system of nonlinear ordinary differential equations. The Keller box scheme, a finite difference method, has been employed for the solution of the nonlinear ordinary differential equations. The behaviour of the working fluid against various parameters of physical nature has been analyzed through graphs and tables. The behaviour of different physical quantities of interest such as heat transfer rate, density of the motile gyrotactic microorganisms and mass transfer rate is also discussed in the form of tables and graphs. It is found that the modified Dufour parameter has an increasing effect on the temperature profile. The solute profile is observed to decay as a result of an augmentation in the nanofluid Lewis number.

中文翻译：

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双扩散对流和运动回旋微生物对磁流体动力学生物对流切线双曲纳米流体的影响

摘要 研究了含有运动回旋微生物和磁流体动力学的双扩散切线双曲纳米流体通过拉伸片。采用变换标度群，将运动控制方程转化为非线性常微分方程组。Keller box 方案是一种有限差分方法，已被用于求解非线性常微分方程。通过图表和表格分析了工作流体对各种物理性质参数的行为。还以表格和图表的形式讨论了不同物理量的行为，例如传热速率、活动回旋微生物的密度和传质速率。发现修改后的 Dufour 参数对温度曲线的影响越来越大。由于纳米流体路易斯数的增加，观察到溶质分布衰减。