The main benefits of submerging tiny-solid particles with the host fluid are to enhance the capability of storing heat, heat exchanger and interaction between the nanomaterials. The objective of this paper is to investigate the steady flow of bio-convective couple stress nanofluid across an inclined stretching cylinder with activation energy, motile microorganisms and nonlinear thermal radiation. The variable temperature conductivity and diffusivity impacts are considered. The Cattaneo–Christov double diffusion theory is also accounted in this model. The governing primary equations are reduced into a coupled system of ODEs by adopting appropriate similarity transformation. The resulting system is integrated numerically utilizing bvp4c tool via MATLAB software. The physical properties of concerned parameters against subjective profiles are examined through tabular and pictorial outline and then discussed in bit detail. It is shown that the velocity field reduces with growing estimations of Reynolds number and buoyancy ratio parameter. It is analyzed that thermal distribution decreases with improving amount of thermal relaxation parameter. Furthermore, concentration of nanoparticles is enhanced for larger amount of thermophoresis parameter. The microorganism field is up surged with enlarging amount of curvature and couple stress fluid parameters.

中文翻译：

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由倾斜的可拉伸圆柱体构成的生物对流耦合应力纳米流体流动中傅立叶和菲克定律的结果

将微小固体颗粒与主体流体浸没的主要好处是增强储存热量、热交换器和纳米材料之间相互作用的能力。本文的目的是研究生物对流耦合应力纳米流体在具有活化能、活动微生物和非线性热辐射的倾斜拉伸圆柱体上的稳定流动。考虑了可变温度电导率和扩散率的影响。Cattaneo-Christov 双扩散理论也包含在该模型中。通过采用适当的相似变换，控制初级方程被简化为 ODE 的耦合系统。所得系统通过 MATLAB 软件利用 bvp4c 工具进行数值集成。通过表格和图形轮廓检查相关参数的物理特性与主观配置文件，然后详细讨论。结果表明，速度场随着雷诺数和浮力比参数估计的增加而减小。分析表明，热分布随着热弛豫参数的增加而减小。此外，较大量的热泳参数提高了纳米粒子的浓度。随着曲率和耦合应力流体参数的增大，微生物场呈上升趋势。分析表明，热分布随着热弛豫参数的增加而减小。此外，较大量的热泳参数提高了纳米粒子的浓度。随着曲率和耦合应力流体参数的增大，微生物场呈上升趋势。分析表明，热分布随着热弛豫参数的增加而减小。此外，较大量的热泳参数提高了纳米粒子的浓度。随着曲率和耦合应力流体参数的增大，微生物场呈上升趋势。