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Design Example: Deciding Thickness of Lubricating Fluid in a Shaft01:23

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Effective lubrication between a rotating shaft and its bearing housing is essential in rotating machinery to minimize friction, wear, and energy loss. With carefully controlled thickness and viscosity, the lubricant layer prevents metal-to-metal contact, ensuring smooth operation.
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Journal bearings are mechanical components that support and provide lateral stability to rotating shafts and axles. They are crucial in reducing friction, wear, and vibration in machinery such as engines, turbines, and pumps. The principle behind journal bearings is forming a thin lubricant film between the bearing surface and the rotating shaft, which minimizes direct contact and reduces frictional forces.
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Rolling with slipping is a physical phenomenon that occurs when a rolling object experiences both rotational and linear motion but also experiences frictional forces that cause slipping. This phenomenon can occur in various situations, such as when a tire rolls on a wet road or a ball rolls on a rough surface.
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Consider a truck trying to pull a stationary car. As the truck exerts a force on the car, static friction is created at the point of contact between the two surfaces. This frictional force resists the car's movement and keeps it at rest. However, when the applied force by the truck surpasses the limiting static frictional force, an interesting phenomenon occurs. The frictional force at the interface reduces to a lower value, known as the kinetic frictional force. At this point, the car...
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Related Experiment Video

Updated: Apr 29, 2026

Experiments on Ultrasonic Lubrication Using a Piezoelectrically-assisted Tribometer and Optical Profilometer
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Lubrication.

Gleb E Yakubov1

  • 1School of Chemical Engineering and Australian Research Council Centre of Excellence in Plant Cell Walls, University of Queensland, St. Lucia, Qld., Australia.

Monographs in Oral Science
|May 28, 2014
PubMed
Summary

Saliva significantly reduces friction between hydrophobic surfaces, crucial for oral health and food processing. This review explores the molecular mechanisms behind saliva

Area of Science:

  • Biophysics
  • Tribology
  • Oral Biology

Background:

  • Saliva's lubricating properties are vital for oral functions.
  • Friction reduction by saliva is significant, especially on hydrophobic surfaces.

Purpose of the Study:

  • To review and interconnect various mechanisms of saliva lubrication.
  • To critically evaluate the role of salivary proteins and their properties in lubrication.

Main Methods:

  • Literature review of saliva lubrication mechanisms.
  • Analysis of physicochemical properties of salivary components.
  • Physical framework to demonstrate mechanism interconnection.

Main Results:

  • Saliva decreases friction by over 100-fold on hydrophobic surfaces.

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  • Specific salivary proteins and their structures are key to lubrication.
  • Interplay between molecular structure and lubrication is demonstrated.

    • Conclusions:

    • Understanding saliva's lubrication mechanisms is essential for oral health.
    • Physicochemical properties of salivary proteins dictate lubricating performance.
    • Further research can optimize lubrication for various applications.