Fluid flow and heat transport by a stretched surface is most important and significant area of research in mechanical and industrial engineering due to numerous applications. The influence of heat transport is seen in the field of polymer processing, metallurgy and chemical engineering, manufacturing of artificial films, food stuff processing, aerodynamics extrusion of plastic sheets, hot rolling, glass fiber production, metal spinning, metal extrusion, drawing of plastic films and wires and paper production. In view of the above applications, we have modeled two-dimensional, steady and incompressible flow of non-Newtonian fluid (third grade) over a stretched Riga surface with Cattaneo-Christov Double Diffusion (CCDD) model. Stagnation point flow is considered and the flow is generated due to stretched Riga surface. Furthermore, Cattaneo-Christov Double Diffusion concept is used instead of Fourier’s and Fick’s laws to model the energy and concentration equations. Important slip mechanisms of Buongiorno nanofluid model i.e., Brownian motion and thermophoresis diffusion are considered for the transportation of heat and mass transfer. Nield condition is imposed at the stretched boundary surface. Total entropy rate is calculated and discussed through second law of thermodynamics and important pertinent flow parameters. Appropriate similarity variable leads to system of ordinary ones and total residual error and convergence rate are obtained via Optimal Homotopy Analysis Method (OHAM). The influence of parameters on the velocity, temperature, concentration and skin friction coefficient are discussed graphically.

由于应用广泛，拉伸表面的流体流动和热传输是机械和工业工程中最重要和最重要的研究领域。在聚合物加工、冶金和化学工程、人造薄膜制造、食品加工、塑料片材空气动力学挤压、热轧、玻璃纤维生产、金属纺丝、金属挤压、塑料拉伸等领域都可以看到热传递的影响薄膜、电线和纸张生产。鉴于上述应用，我们使用 Cattaneo-Christov 双扩散 (CCDD) 模型模拟了非牛顿流体（三级）在拉伸的里加表面上的二维、稳定和不可压缩流动。考虑了驻点流动，流动是由于拉伸里加表面而产生的。此外，使用 Cattaneo-Christov 双扩散概念代替傅立叶和菲克定律来模拟能量和浓度方程。Buongiorno 纳米流体模型的重要滑移机制，即布朗运动和热泳扩散被考虑用于传热和传质。在拉伸边界面上施加 Nield 条件。通过热力学第二定律和重要的相关流动参数计算和讨论总熵率。通过最优同伦分析法(OHAM)，适当的相似变量导致系统的普通系统和总残差和收敛速度。以图形方式讨论了参数对速度、温度、浓度和皮肤摩擦系数的影响。