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Objective: To investigate the impact of Soret and Dufour on the behaviour of Casson nanofluids over nonlinear stretching surfaces. Also, to study heat transfer efficiency in practical thermal systems and analysing the heat and mass transfer properties. Method: The governing equations for fluid flow, heat transfer, and mass transfer are transformed into dimensionless form using similarity transformations. These equations are then solved numerically using MATLAB’s bvp4c procedure. Findings: Increasing the Soret number enhances fluid concentration, while the Dufour number reduces concentration. The results are validated against existing studies, confirming the reliability of the model. Novelty: Casson rheology, micropolar fluid dynamics, and cross-diffusion effects under nonlinear stretching conditions provide a comprehensive framework for understanding non-Newtonian fluid behaviour. The findings offer significant insights for optimizing thermal systems, particularly in heat exchangers and mixing technologies. Keywords: Soret; Skin friction; Casson nanofluid; Diffusion; Thermal
Ramya et al. (Mon,) studied this question.