Ranque-Hilsch (vortex) tube with water as fluid

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SUMMARY

The discussion centers on the feasibility of using water as the working fluid in a Ranque-Hilsch vortex tube, traditionally operated with air. Key differences highlighted include water's higher density and viscosity, which may affect angular velocity and temperature gradients. The lack of existing research on water's application in this context raises questions about the underlying physical principles that govern vortex tube functionality. Understanding these principles is essential to predict the performance of water in this device.

PREREQUISITES
  • Understanding of fluid dynamics principles
  • Knowledge of thermodynamics, particularly regarding compressible vs. incompressible fluids
  • Familiarity with vortex tube operation and design
  • Basic physics concepts related to density and viscosity
NEXT STEPS
  • Research the thermodynamic properties of water compared to air in vortex applications
  • Explore existing studies on vortex tube efficiency with different fluids
  • Investigate the mathematical modeling of vortex tubes using incompressible fluids
  • Learn about experimental setups for testing fluid dynamics in vortex tubes
USEFUL FOR

Engineers, physicists, and hobbyists interested in fluid dynamics, thermodynamics, and the design of vortex tubes. This discussion is particularly relevant for those exploring alternative working fluids in thermal applications.

Termotanque
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I'm very interested in building this cool device, and was wondering if water could be used instead of air as the injected fluid.

The main differences I notice are the much larger density, and thus possibly smaller angular velocity. And higher viscosity, which could mean a smaller radial gradient of temperature.

I've also had no luck finding people using water instead of air, but alas no explanation why not either.

If the physical principle why it works was known, one could predict if water would work or not.

What do you think or know?
 
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Air is compressible and water isn't, which is why air cools when expanded.
 

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