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In this study, the dynamics of gravity-driven shear thinning liquid rivulet falling over an inclined plane is assessed through numerical and experimental investigation. Instability in a fluid displacement is a complex phenomenon, governed by factors like three phase contact line, inclination, external body forces, fluid deformation and many factors yet to be completely resolved. Here, shear thinning fluid is modified with certain polymers and surfactants to enhance the wetting and also to understand the dynamics of instability by performing experiments and validate with the numerical 3D model. Cross flow model is referred to simulate the fluid and characterized using volume of fluid multiphase model. The simulation results were in comparable trend with experimental work for all the formulations with shear thinning fluid. Further, inclination angle is varied for both experiment and simulation to study the growth of instability and enhancement of wettability. On comparing both the results, 80% of the experiment data is closely in agreement with simulation.

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Experimental and Numerical Validation on Instability of Gravity-Driven Shear Thinning Fluid

  • 会议论文

  • 发表日期：

    2025年

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  • Shanmugam Viswanathan,
  • Vikash Vashisth,
  • Anugrah Singh,
  • Senthilmurugan Subbiah

摘要

In this study, the dynamics of gravity-driven shear thinning liquid rivulet falling over an inclined plane is assessed through numerical and experimental investigation. Instability in a fluid displacement is a complex phenomenon, governed by factors like three phase contact line, inclination, external body forces, fluid deformation and many factors yet to be completely resolved. Here, shear thinning fluid is modified with certain polymers and surfactants to enhance the wetting and also to understand the dynamics of instability by performing experiments and validate with the numerical 3D model. Cross flow model is referred to simulate the fluid and characterized using volume of fluid multiphase model. The simulation results were in comparable trend with experimental work for all the formulations with shear thinning fluid. Further, inclination angle is varied for both experiment and simulation to study the growth of instability and enhancement of wettability. On comparing both the results, 80% of the experiment data is closely in agreement with simulation.