How Do You Calculate Nozzle Pressure in a Rotating Spray Dry Atomizer?

[Bill B]

This is a spray dry atomizer problem. I have a shaft that rotates at 6000 ropm. On top of the shaft sits a bowl with two arms that are 180 degrees apart. At the end of each arm is a spray nozzle with a 5/32 inch hole. The length of each arm with the nozzle attached is 12 inches from the center line of the shaft.

If I fill the bowl with water at the rate of 5 gallons a minute with the shaft spinning, what is the pressure at the nozzles?

I calculated a no-flow pressure of about 12,000 G at the nozzles but I don't know how to calculate the pressure with a flowing liquid

Bill B

 

[Clausius2]

Typical engineering adage: "Let's Employ Bernoulli".

 

[sir-pinski]

Based on the information provided, it seems like the main issue with the spray dry atomizer is determining the pressure at the nozzles when there is a flowing liquid. To calculate this, you will need to take into account the flow rate of 5 gallons per minute and the size of the nozzles (5/32 inch).

One approach could be to use the Bernoulli's equation, which states that the total pressure at a point is equal to the static pressure plus the dynamic pressure. In this case, the dynamic pressure can be calculated using the flow rate and the size of the nozzles. From there, you can add the static pressure (which is the pressure at rest) to get the total pressure at the nozzles.

Another approach could be to use the equation for pressure drop in a pipe, which takes into account the flow rate, fluid properties, and pipe dimensions. This can give you an estimate of the pressure at the nozzles, but keep in mind that the nozzles are not in a pipe and may not have the same pressure drop.

It may also be helpful to consult with a fluid dynamics expert or consult with the manufacturer of the spray dry atomizer for more precise calculations. I hope this helps in troubleshooting the issue with your spray dry atomizer.