# Output pressure formula for a pressurized waterjet

Hello,

We have a pressurized Water-jet stream, where the nozzle d= 0.8 mm. We can measure the fluid output in mm3/s, to determine the speed by dividing over the area.

For this, F=ρAv2

However, the variable that would be changing, would be the distance from the nozzle to the target. If we assume that as long as the water-jet stream maintains coherence, A1=A2, therefore cancelling A for P=F/A, would the simplified formula:
P=ρv2

Be correct (if we do not want to be overly particular of effects that might not alter this formula in a significant way)?

Thanks,

.Yes, the simplified formula is correct in this case. However, it is important to note that the pressure of the water-jet stream depends on other factors such as the viscosity and density of the fluid used, as well as the size of the nozzle. Therefore, in order to accurately calculate the pressure of the water-jet stream, it is important to take into account all of the relevant variables.

## 1. What is the output pressure formula for a pressurized waterjet?

The output pressure formula for a pressurized waterjet is:
P = (m_dot * V_dot) / A
Where P is the output pressure, m_dot is the mass flow rate, V_dot is the volume flow rate, and A is the area of the nozzle.

## 2. How do I calculate the mass flow rate for a pressurized waterjet?

The mass flow rate can be calculated by dividing the volume flow rate by the density of water at the given pressure and temperature. This can be found using a water density calculator or through experimental data.

## 3. What is the role of the nozzle area in the output pressure formula?

The nozzle area plays a crucial role in the output pressure formula as it determines the cross-sectional area through which the water is forced. A smaller nozzle area will result in a higher output pressure, while a larger nozzle area will result in a lower output pressure.

## 4. Can the output pressure formula be used for all types of pressurized waterjets?

Yes, the output pressure formula can be used for all types of pressurized waterjets as long as the necessary parameters (mass flow rate, volume flow rate, and nozzle area) are known. However, the formula may need to be modified for specialized or unique waterjet systems.

## 5. How does the output pressure affect the cutting power of a waterjet?

The output pressure directly affects the cutting power of a waterjet. A higher output pressure means a higher velocity of the water, which results in a stronger cutting force. However, too much pressure can also cause excessive turbulence and affect the precision of the cutting process.