Use of capillarity in pumping water

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Discussion Overview

The discussion focuses on the use of capillarity in pumping water, exploring its potential to raise water to greater heights and the energy considerations involved. Participants examine both theoretical and practical applications of capillary action in various contexts, including natural systems like plants and artificial systems like wetting devices.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification

Main Points Raised

  • Some participants propose that capillarity can indeed raise water, but it requires input energy to overcome the forces that keep the water attracted to the tube at the top.
  • Others argue that while capillary action can pump water, the maximum height achievable without external energy remains uncertain and may depend on the diameter of the tube used.
  • A later reply mentions existing automatic plant wetting systems that utilize capillary effects, prompting a reflection on the energy dynamics involved in such systems.

Areas of Agreement / Disagreement

Participants generally agree that capillarity can raise water but disagree on the limits of this capability and the role of external energy in practical applications.

Contextual Notes

Limitations include the dependence on tube diameter and the unresolved question of the maximum height achievable solely through capillarity without external energy input.

vinay ks
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capillarity has the power to raise water.. then can it be used to pump water to greater heights?
 
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Yes, but it takes input energy. The same surface tension which draws it up also keeps it strongly attracted to the tube at the top. Energy has to be used to get it out of the tube.

In plants, capillary action pumps water and the input energy is the sun (evaporation, etc).
 
yeah right! but what is the maximum limit upto which u can raise water just using capillarity and without the aid of external energy?? isn't it possible by making a tube of very small diameter??
 
There are automatic plant wetting systems that use capillary effects, they do move water up to some extent. Actually up to now I have never thought about the way they work from the energy point of view.
 

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