Atomization and Evaporation: Understanding the Energy Exchange

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SUMMARY

The discussion centers on the energy exchange involved in the atomization and evaporation of liquids. It establishes that when a liquid is forced through a small orifice, the pressure drop results in a release of heat, which can lead to phase changes. The power generated is calculated using the volume flow rate in cubic meters per second multiplied by the pressure drop in pascals, yielding power in watts. Additionally, the heat necessary for boiling the liquid originates from the pump's power supply that increases the liquid's pressure.

PREREQUISITES
  • Understanding of fluid dynamics principles, specifically pressure and flow rate.
  • Knowledge of thermodynamics, particularly phase changes of liquids.
  • Familiarity with hydraulic systems and energy conversion.
  • Basic calculations involving power, pressure, and volume in physics.
NEXT STEPS
  • Research the principles of fluid dynamics and their applications in atomization.
  • Study thermodynamic properties of liquids and the energy required for phase changes.
  • Learn about hydraulic systems and how pressure influences energy transfer.
  • Explore the calculations involved in determining power from flow rate and pressure drop.
USEFUL FOR

Engineers, physicists, and anyone involved in fluid mechanics or thermal systems will benefit from this discussion, particularly those focused on energy efficiency in atomization and evaporation processes.

russellsh2
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Split from https://www.physicsforums.com/threads/steves-random-physics-questions.1051467/
Oh, also, I know that it takes a lot of energy to phase change a liquid to a gas, but what if you force the liquid through a small hole that atomizes the liquid. Does the atomized liquid draw the same amount of heat from the surrounding area as its forced to become steam?
 
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When you have a volume of liquid flow through a hole, with a pressure drop across the hole, heat is released in the fluid. The volume in metres cubed per second, multiplied by the pressure drop in pascals, gives the power in watts, or joules per second.

The heat that passes to, and boils the liquid, comes from the power supply to the pump that raised the pressure.
 
Baluncore said:
The volume in metres cubed per second,
Just a clarification please: Is that the volume of the liquid before passing thru the hole? It seems to be the only way that statement makes sense.
 
Tom.G said:
Is that the volume of the liquid before passing thru the hole?
Yes, the volume of liquid.
That is a fundamental of hydraulics.
The pressure in the liquid is potential energy, which is converted to kinetic energy in the orifice, to become a hotter liquid and/or a vapour.
 
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