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<p>Understanding the principles governing squeeze film lubrication is essential for optimising the performance and lifespan of mechanical systems. This study investigates the squeeze film characteristics between a sphere and a porous plate, utilising the Rabinowitsch fluid model to account for the non-Newtonian behaviour of the lubricant. The primary objective is to analyse the impact of viscosity variation and porosity on key performance indicators, including pressure distribution, load-carrying capacity and squeezing time. This study derives a closed-form expression for bearing properties using the Reynolds equation, Morgan–Cameron approximations and perturbation techniques. The influence of several key parameters on bearing performance is rigorously investigated. These parameters include viscosity variation (0 ≤ <i>Q</i> ≤ 0.4), porosity parameters (0 ≤ <i>R</i><sub><i>p</i></sub> and <i>H</i><sub><i>p</i></sub> ≤ 0.3<i>)</i> and the non-Newtonian characteristic parameter (−0.001 ≤ <i>β</i> ≤ 0.001). Results indicate that non-dimensional pressure, load and squeezing time increase with the magnitude of the viscosity parameter while they decrease with increasing permeability. Furthermore, the analysis considers the impact of Rabinowitsch fluid behaviour, encompassing both pseudoplastic and dilatant characteristics. Furthermore, compared to Newtonian lubricants, dilatant fluids exhibit higher pressure, load-carrying capacity and squeezing time, whereas pseudoplastic fluids demonstrate lower values for these parameters.</p>

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Study of the effects of squeeze film lubrication on the variation of viscosity between the sphere and the porous wall plate using the Rabinowitsch fluid model

  • 期刊论文

  • 发表日期：

    2025年6月25日

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  • R Lakshmi,
  • B N Hanumagowda,
  • C K Sreekala,
  • Siddharam Patil,
  • J Madhu,
  • Taseer Muhammad,
  • Raman Kumar

摘要

Understanding the principles governing squeeze film lubrication is essential for optimising the performance and lifespan of mechanical systems. This study investigates the squeeze film characteristics between a sphere and a porous plate, utilising the Rabinowitsch fluid model to account for the non-Newtonian behaviour of the lubricant. The primary objective is to analyse the impact of viscosity variation and porosity on key performance indicators, including pressure distribution, load-carrying capacity and squeezing time. This study derives a closed-form expression for bearing properties using the Reynolds equation, Morgan–Cameron approximations and perturbation techniques. The influence of several key parameters on bearing performance is rigorously investigated. These parameters include viscosity variation (0 ≤ Q ≤ 0.4), porosity parameters (0 ≤ Rp and Hp ≤ 0.3) and the non-Newtonian characteristic parameter (−0.001 ≤ β ≤ 0.001). Results indicate that non-dimensional pressure, load and squeezing time increase with the magnitude of the viscosity parameter while they decrease with increasing permeability. Furthermore, the analysis considers the impact of Rabinowitsch fluid behaviour, encompassing both pseudoplastic and dilatant characteristics. Furthermore, compared to Newtonian lubricants, dilatant fluids exhibit higher pressure, load-carrying capacity and squeezing time, whereas pseudoplastic fluids demonstrate lower values for these parameters.