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If the flow is subsonic the pressure will increase, if however it is supersonic the pressure will decrease.
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Why to use a converging and diverging nozzle in a steamturbine?
I tried to answer this question 4 times but WikiAnswers won't accept the code word to submit it, even though it is correct all 4 times. Converging / diverging nozzles are used with compressible fluids (gases, including steam) to increase their velocity. The converging section (cross-sectional area decreasing in the direction of flow) increases the velocity until it reaches the velocity of sound in the gas (sonic velocity - "Mach 1"). At that point, further reduction in area would slow the gas down, but increasing the cross-sectional area in the direction of further flow allows the gas to expand and increase its velocity to supersonic. If you only had a converging nozzle the maximum speed of the gas could only be subsonic or sonic. The diverging portion of the nozzle needs to be added to achieve supersonic speeds. The converging-diverging nozzle (also known as DeLaval nozzle) is used in steam turbines, most if not all rocket engines and all supersonic wind tunnels. +++ Actually, gas flowing though a diverging nozzle LOSES velocity but gains pressure, and it is pressure in the impinging stream the turbine needs, not its velocity.
What happens when Carbon dioxide gas is compressed at room temperature and the pressure is suddenly released?
When carbon dioxide gas is compressed at room temperature and the pressure is suddenly released, it undergoes a process called adiabatic expansion. This leads to a rapid decrease in pressure and a decrease in temperature as the gas expands. Sometimes, this sudden decrease in temperature can cause the gas to condense into a solid or a white mist.
Why does the stream of water travel farther when less water is flowing from the end of the hose?
When using a high pressure pump, you'll find that a smaller output nozzle gives *shorter* spray than a large nozzle. Small nozzles limit the flow. Yet with a garden hose things are reversed. Why? It's because the long narrow hose and the pipes connecting it are acting like "friction." If you turn on the water, the hose rubs against the wate, and water flows relatively slowly out the end of the hose. Also, the water pressure at the open end of the hose is very low. Now install a garden sprayer at the hose end. This will greatly slow down the water flow, and the effect of friction is greatly reduced. The pressure at the far end of the hose rises, and this high pressure can create a very long (but narrow) spray. Another way to explain is with numbers. The greater the fluid resistance is to a constant flow, the greater the pressure-difference must be across that resistance. The fluid resistance value of the hose is large, while the resistance value of the hose-end is small, and since the same flow goes through both the hose and through its end-opening, most of the pressure-difference appears along the hose, while very little pressure-difference appears between the hose and its opening. Now install a very narrow opening. If the fluid resistance of this nozzle is the same as the fluid resistance of the hose, then half of the faucet pressure appears along the hose, while the other half appears between the hose-end and the outside world. The nozzle has increased the pressure at the hose end. And if the fluid resistance value of the nozzle is much greater than that of the hose, then nearly all of the faucet pressure will appear at the nozzle. So, to produce a long jet of water, use a very wide hose and a very narrow nozzle. Or even better, entirely get rid of the resistance created by the hose, and connect the nozzle directly to a high pressure water pump.
Streak-Free Pressure Washing?
While pressure washing, it may be tempting to point the nozzle and spray in whichever direction feels appropriate. However, this can cause streaks and incomplete cleaning. Instead, start at the very top of the object and spray using broad, slow strokes. Wash three and four foot sections at at time, sweeping the nozzle back and forth slowly. Move down to the next section after the first one is clean. Work your way from the top all the way to the bottom in this manner.
Cleaning Basement mold?
Pressure washing can be a fast way of removing mold and algae build up. Use a surface cleaner from best car gurus to do it multiple times faster than a regular nozzle
Why do rockets have a Diverging Nozzle at the exit?
To increase the exhaust velocity. +++ Pressure, not velocity. A gas flowing through a divergent nozzle gains pressure at the cost of speed.
What is convergent divergent nozzle?
Convergent nozzle indicates nozzles will converge with an end closing together at the end divergent nozzles increase size at the end. If air flows in this direction: ---> Convergent nozzle > Divergent nozzle <
Why does a gas flowing supersonically in Laval nozzle continue to accelerate even though the flow area is increasing in the divergent section of the nozzle?
In the converging section of the nozzle,relatively high pressure expanding has a small increase in specific volume. At lower pressures the increase in specific volume is large.
Is the pressure at the throat of a convergent-divergent nozzle highest or lowest?
coz area is less thats y pressure is more
What is critical pressure in nozzle?
Critical pressure in a nozzle is the pressure at which the flow of material through the nozzle reaches its maximum. Beyond which any increase in pressure will not result in an increase in flow. The point at which the velocity of a fluid in the throat of the nozzle reaches the local speed of sound, creating a sonic wave, or a sonic choke.
What is use of jet nozzle?
To increase thrust or pressure
Why Fluid Speed Increases in the Divergent Portion of a Convergent-Divergent nozzle?
Because the fluid is allowed to expand in the nozzle it increases velocity to fill in the voids created by the shape of the nozzle. The convergent point of the nozzle acts like a bottleneck trying to slow the fluid and compress it into the reduced crosssection of the nozzle. As it leaves the minimum crosssection it expands into the divergent spaces of the nozzle increasing in velocity as it expands. ++_+ No: it gains velocity through the convergence but in the diverging section, trades velocity for pressure.
What are the advantages and disadvantages of flow nozzle?
One disadvantage in the convergent-divergent nozzle as a shock wave can take place in the nozzle A nozzle is a device that converts pressure energy to kinetic energy (increasing fluid velocity on the account of static pressure) For a convergent nozzle there is no disadvantages as it can raise the fluid velocity only for the sonic speed the convergent-divergent type raises the velocity to over than sonic speed making supersonic flow, this could make a shock wave in the nozzle that turns the supersonic flow to subsonic flow
What is the working principle of convergent-divergent nozzle?
A NOZZLE IS A DUCT WHICH CONVERT HEAT ENERGY INTO KINETIC ENERGY.IT INCREASES VELOCITY OF FLUID PASSING THROUGH IT ,AT THE EXPENCE OF PRESSURE. STEAM EXPANDS IN NOZZLE FOLLOW RANKINE CYCLE.FLOW THROUGH NOZZLE IS ISENTROPIC. mritunjay04@gmail.com
What is steam nozzles types of seam nozzles?
1) convergent nozzle 2)divergent nozzle
What is the difference between convergent divergent nozzle and venturi tube?
In case of venturi meter, at the diverging section mach number is less than 1. however in diverging section of a nozzle mach number is greater than 1.
What is a normal operating pressure of a fire hydrant at the nozzle when operational?
It varies. I have seen a range of between 50 psi to 225 psi. It is affected by distance, size of water lines and their configuration and elevation change from source to the hydrant, as well as the type of pressurization, gravity or pump. On average though 80 to 100 psi. Of course a larger nozzle would decrease the residual pressure while a smaller nozzle would tend to increase residual pressure. 125 psi is about the maximum pressure for a "hand line" in order to be manageable.
