Transportation of heat and mass along with irreversibility analysis for the flow of Couple stress fluid past over a nonlinear stretched surface is reported in this exploration. The novel features and purpose of this report is to notice the involvement of variable thermophysical characteristics i.e. (variable magnetic field, thermal conductivity, diffusion coefficient) for the couple stress model. Flow is produced over a non-linear stretched surface under constant pressure. Variable wall temperature, wall concentration and variable magnetic field are observed. Thermal transport is influenced by thermal radiation. Conducting mass in the light of Fick's second law is derived by adding a chemical reaction. Flow presenting partial differential equations describing the conservation laws are modelled under boundary layer approximation in Cartesian coordinate system. Similarity transformation is used to convert these coupled nonlinear fluid flow equations into ordinary differential equations. The converted nonlinear coupled system of differential equations is solved analytically using optimal homotopy procedure. Mathematical software Mathematica 11.0 is used to handle the computational complexity. Solution for velocity, temperature, concentration and entropy generation is displayed and it is discussed for the flow against numerous influential parameters. Numerical values for the dimensionless stresses, rate of heat and mass transfer is computed and tabulated. Moreover, limiting case of present exploration is compared to that of existing literature and an excellent agreement in results is noted. Also, it has been drafted that magnetic parameter retards the flow, whereas, the increment in ratio parameter and fluid parameter upsurges the velocity field.

在这项探索中，报告了热量和质量的传输以及对耦合应力流体流过非线性拉伸表面的不可逆性分析。该报告的新颖特征和目的是要注意耦合应力模型涉及的可变热物理特性，即（可变磁场，导热系数，扩散系数）。在恒定压力下在非线性拉伸表面上产生流动。观察到可变的壁温，壁浓度和可变的磁场。热传输受热辐射影响。根据菲克第二定律的传导质量是通过添加化学反应得出的。在笛卡尔坐标系中，在边界层近似的情况下，对表示守恒律的表示偏微分方程的流量进行建模。使用相似变换将这些耦合的非线性流体流动方程式转换为常微分方程式。使用最优同伦过程以解析方式解决了微分方程的非线性转换耦合系统。数学软件Mathematica 11.0用于处理计算复杂性。显示了速度，温度，浓度和熵生成的解决方案，并针对众多影响参数讨论了流量的解决方案。计算并列出无量纲应力，传热速率和传质速率的数值。此外，将当前勘探的有限情况与现有文献进行了比较，并指出了极好的结果。另外，已经提出，磁参数会阻碍流动，而比率参数和流体参数的增加会激增速度场。