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Density and Archimedes' Principle

When a lump of clay is dropped into water, it sinks. But if the same lump of clay is molded into the shape of a boat, it starts to float. Because of its shape, the clay boat displaces more water than the lump and experiences a greater buoyant force, even though its mass is the same. The same holds true for steel ships. The average density of an object majorly determines if the object will float. If an object's average density is less than that of the surrounding fluid, it will float. The reason...
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Experimental Procedure for Laboratory Studies of In Situ Burning : Flammability and Burning Efficiency of Crude Oil
12:34

Experimental Procedure for Laboratory Studies of In Situ Burning : Flammability and Burning Efficiency of Crude Oil

Published on: May 1, 2018

Can water float on oil?

Chi M Phan1, Benjamin Allen, Luke B Peters

  • 1Department of Chemical Engineering, Curtin University, Perth, WA 6845, Australia. c.phan@curtin.edu.au

Langmuir : the ACS Journal of Surfaces and Colloids
|February 23, 2012
PubMed
Summary
This summary is machine-generated.

Water droplets can float on oil if the equilibrium contact angle exceeds 5°. This finding, based on a numerical model of interfacial tensions, is crucial for oil waste biodegradation.

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Area of Science:

  • Physical Chemistry
  • Fluid Dynamics
  • Environmental Science

Background:

  • Understanding the behavior of water droplets on oil surfaces is critical for various environmental and industrial processes.
  • The stability of liquid-liquid interfaces is governed by interfacial tensions and fluid properties.

Purpose of the Study:

  • To investigate the floatability of water on oil surfaces.
  • To develop a numerical model predicting the equilibrium conditions for floating water droplets.
  • To identify key parameters influencing droplet stability and floatability.

Main Methods:

  • Developed a numerical model based on the Young-Laplace equation, considering three interfaces: water/oil, water/air, and oil/air.
  • Verified the model using an oil/water system to ensure predictive accuracy.
  • Analyzed the influence of interfacial tensions, oil density, and water droplet volume on stability.

Main Results:

  • The model successfully predicted theoretical equilibration conditions for floating water droplets.
  • Droplet stability is determined by a combination of interfacial tensions, oil density, and water volume.
  • An equilibrium contact angle greater than 5° is required for effective water droplet floatability on oil.

Conclusions:

  • The study provides a validated model for predicting water droplet floatability on oil.
  • The findings highlight the critical role of interfacial dynamics and physical properties in determining droplet stability.
  • This research has significant implications for applications such as the biodegradation of oil wastes.