Pressure Washer, water properties exiting nozzle

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Hi all. I hope to have a better understanding of the consequence of introducing high heat on water in a hot water pressure washer.

I know that hot water cleans better than cold or warm, and steam even cleans better. But am I harnessing the additional heat energy applied to the water in the scenario below?

Scenario: I have a a hot pressure washer capable of 6 gallons per minute at 4300 psi, the boiler is controlled by a thermostat (ambient to 325F) and is fitted with a burner capable of 700,000 BTU's. A high pressure hose and trigger gun is fitted to the boiler exit. The trigger gun has a port to install a quick connect nozzle. The nozzle installed is a zero degree nozzle(non-expanding), sized 0006.0 (at 4000 psi upstream pressure, this nozzle size would allow all 6 gallons per minute to pass through the nozzle).

Ok, here is the question: If I heated the water in the boiler to 300F what would be the properties of the fluid immediately after leaving the nozzle?


The pressure outside the nozzle would be atmospheric, correct?,


What phase or percentage of various phases would it have, and what about the fluid temperature?

Pressure wash operators use a tool called a surface cleaner, which passes the fluid through a high speed swivel, the fluid is then split into two or more equal portions via arms. The nozzles are angled at 15 degrees from the vertical to harness the reaction forces of the fluid stream and produce a rotating motion. The rotating arms are housed in a dome shell, which traps some of the heat and may allow for a small increased pressure over atmospheric, due to the low clearance between the dome and the surface being cleaned.



Thank You
 

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Answers and Replies

  • #2
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Can someone explain what is happening just outside the spray nozzle under the conditions described?

Thanks
 

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