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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.
How does a accelerator works on a dry system?
In a dry system, an accelerator typically works by releasing a compressed gas, such as air or CO2, into the system to increase the pressure and flow rate of the abrasive particles. This increased pressure propels the abrasive particles more forcefully out of the nozzle, resulting in faster and more efficient cutting or cleaning processes.
What happens when Carbon dioxide gas is compressed at room temperature and the pressure is suddenly released?
When the pressure is released, some of the liquid will transition into a gas, cooling some of the liquid into dry ice frost or snow, which can be collected and pressed into pellets or blocks. This is similar to what happens when you get frost on the nozzle of a CO2 fire extinguisher. The freezing point of carbon dioxide is -109.3°F or -78.5° C, so dry ice won't stay solid for long at room temperature.
How does whip cream dispense from a can of reddi whip?
Whipped cream is dispensed from a can of Reddi-wip by releasing the pressure inside the can, which propels the cream out through a nozzle. When the nozzle is pressed, a small amount of the gas inside the can is released, causing the cream to be pushed out and aerated.
What instrument measures tire pressure?
A tire pressure gauge is used to measure the air pressure inside a tire by pressing a nozzle onto the valve stem of the tire, providing a reading of the pressure level on a display. This helps ensure that the tire pressure is at the recommended level for safe driving and optimal tire performance.
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 <
How can expansion take place when steam pass through a nozzle?
When steam passes through a nozzle, it undergoes adiabatic expansion due to the decrease in pressure. This expansion causes the steam to increase in velocity as it exits the nozzle, converting some of its internal energy into kinetic energy. The increase in velocity results in a decrease in pressure and an increase in velocity, which can be harnessed in devices such as turbines.
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.
How does a shower head affect water pressure?
A shower head can affect water pressure by controlling the flow rate of water through its nozzle. A smaller nozzle size can increase pressure by forcing the water through a smaller opening, while a larger nozzle size can decrease pressure by allowing more water to flow through. Additionally, the design and shape of the shower head can also impact water 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
Why does pressure drops in a nozzle?
Pressure drops in a nozzle due to the conversion of potential energy into kinetic energy as the fluid accelerates through the nozzle. This decrease in pressure is necessary for the fluid to reach a higher velocity.
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
