Topic
Lubrication theory
About: Lubrication theory is a research topic. Over the lifetime, 1713 publications have been published within this topic receiving 50261 citations. The topic is also known as: Fluid bearing.
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367 citations
13 Nov 1998
TL;DR: In this article, the authors studied the properties of viscous viscous lubricant films and their properties in terms of fluid inertia, flow stability and transition, thermal effects, and gas lubrication index.
Abstract: Preface 1. Introduction 2. Basic equations 3. Thick film lubrication 4. Dynamic properties of lubricant films 5. Effects of fluid inertia 6. Flow stability and transition 7. Turbulence 8. Elastohydrodynamic lubrication 9. Thermal effects 10. Lubrication with non-Newtonian fluids 11. Gas lubrication Index.
352 citations
TL;DR: In this article, it was shown that either an outward flow toward the contact line or an inward flow towards the center of the droplet can be induced, depending on the evaporative driving force.
Abstract: An emergent technique of patterning surfaces with solid particles utilizes the evaporation of colloidal droplets from a substrate. Upon complete evaporation of the liquid, the suspended particles remain adhered to the solid in a variety of patterns. Experimentally, the type of particle deposit has been correlated with the mode of liquid evaporation. It is expected that the manner in which the liquid evaporates from the droplet should significantly affect the flow of fluid inside the droplet. Therefore, the determination of the flow profiles in the droplet will aid in understanding the redistribution of particles under different experimental conditions. Using lubrication theory, this study shows that either an outward flow toward the contact line or an inward flow toward the center of the droplet can be induced, depending on the evaporative driving force. If an outward flow toward the contact line is generated inside the droplet, then a ringlike deposit remains on the substrate. Conversely, if the liquid i...
350 citations
TL;DR: In this article, an analysis of the propagation of a penny-shaped hydraulic fracture in an impermeable elastic rock is presented, where the fracture is driven by an incompressible Newtonian fluid injected from a source at the center of the fracture.
349 citations
TL;DR: An analysis using lubrication theory accounts for most of the observations, showing that a steady regime where a drop can be kept bouncing for any length of time is found.
Abstract: When a drop of a viscous fluid is deposited on a bath of the same fluid, it is shown that its coalescence with this substrate is inhibited if the system oscillates vertically. Small drops lift off when the peak acceleration of the surface is larger than $g$. This leads to a steady regime where a drop can be kept bouncing for any length of time. It is possible to inject more fluid into the drop to increase its diameter up to several centimeters. Such a drop remains at the surface, forming a large sunk hemisphere. When the oscillation is stopped, the two fluids remain separated by a very thin air film, which drains very slowly ($\ensuremath{\sim}30\text{ }\text{ }\mathrm{min}$). An analysis using lubrication theory accounts for most of the observations.
335 citations