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<p>The significance of this study lies in providing insights into the complex flow behaviour resulting from the combined effects of stretching, rotation and thermo-mass diffusion with an off-centre stagnation point, which is relevant to various engineering and industrial processes. The objective is to investigate the theoretical aspects of fluid flow over a stretching and rotating disk when the stagnation point is displaced from the centre, incorporating the Soret and Dufour effects. The governing equations for continuity, momentum, energy and species concentration are transformed into a system of ordinary differential equations using similarity transformations and solved numerically. The results reveal that the Schmidt number, Prandtl number, Soret and Dufour coefficients, rotation parameter and heat and mass transfer Biot numbers strongly influence the velocity, temperature and concentration profiles. Furthermore, the combined effects of stretching and rotation produce a spiral surface velocity, whereas in the absence of stretching, the motion reduces to a circular motion, thereby highlighting the interplay of parameters on heat and mass transfer rates.</p>

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Off-centred stagnation point flow over a stretchable rotating disk in the presence of Soret–Dufour effects

  • 期刊论文

  • 发表日期：

    2026年4月22日

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  • Suman Sarkar,
  • Golam Mortuja Sarkar,
  • Joydeb Pal,
  • Madhusudan Bera

摘要

The significance of this study lies in providing insights into the complex flow behaviour resulting from the combined effects of stretching, rotation and thermo-mass diffusion with an off-centre stagnation point, which is relevant to various engineering and industrial processes. The objective is to investigate the theoretical aspects of fluid flow over a stretching and rotating disk when the stagnation point is displaced from the centre, incorporating the Soret and Dufour effects. The governing equations for continuity, momentum, energy and species concentration are transformed into a system of ordinary differential equations using similarity transformations and solved numerically. The results reveal that the Schmidt number, Prandtl number, Soret and Dufour coefficients, rotation parameter and heat and mass transfer Biot numbers strongly influence the velocity, temperature and concentration profiles. Furthermore, the combined effects of stretching and rotation produce a spiral surface velocity, whereas in the absence of stretching, the motion reduces to a circular motion, thereby highlighting the interplay of parameters on heat and mass transfer rates.