Mechanical Engineering - Steam Nozzles and Turbines - Discussion


The flow through a nozzle is regarded as

[A]. constant volume flow
[B]. constant pressure flow
[C]. isothermal flow
[D]. isentropic flow

Answer: Option D


No answer description available for this question.

Purny said: (Aug 5, 2014)  
ENTROPY remains constant is called an isentropic process.

Rohit said: (Sep 11, 2014)  
It an adaibatic process.

Er.Yugal said: (Sep 18, 2014)  
Because heat transfer zero.

Pravin said: (Jan 23, 2015)  
What is entropy?

Shankar said: (Feb 10, 2015)  
There is no any change in entropy during flow in nozzle.

Ranjesh said: (Feb 27, 2015)  
Entropy is the rate of randomness of the molecules of fluid.

Saikumar said: (Mar 12, 2015)  
ds = dq/dt, q heat, t temperature.

Saikumar said: (Mar 12, 2015)  
While considering flow through a tube, if the flow is very gradually compressed (i.e. Area decreases) and then gradually expanded (i.e. Area increases), the flow conditions are restored (i.e. Return to its initial position).

So, such a process is a reversible process. According to the Second Law of Thermodynamics, whenever there is a reversible flow, constant value of entropy is maintained. Engineers classify this type of flow as an isentropic' flow of fluids. Isentropic is the combination of the Greek word "iso" (which means - same) and entropy.

Karan Rana said: (Apr 22, 2015)  
As a gas is forced through a tube, the gas molecules are deflected by the walls of the tube. If the speed of the gas is much less than the speed of sound of the gas, the density of the gas remains constant and the velocity of the flow increases. However, as the speed of the flow approaches the speed of sound we must consider compressibility effects on the gas.

The density of the gas varies from one location to the next. Considering flow through a tube, as shown in the figure, if the flow is very gradually compressed (area decreases) and then gradually expanded (area increases), the flow conditions return to their original values. We say that such a process is reversible. From a consideration of the second law of thermodynamics, a reversible flow maintains a constant value of entropy.

Laxman said: (Jun 3, 2015)  
Entropy means molecular disorderness of any system.

Lava said: (Jul 13, 2015)  
It is a reversible adiabatic process.

Science Wala said: (Oct 1, 2015)  
It is both adiabatic and reversible. That is no heat is added and no energy transformation occurs.

Ranjeet Singh Yadav said: (Dec 11, 2015)  
Entropy is measure of degree of randomness of molecules of system.

Ali Hassan said: (Jul 22, 2016)  
Entropy is the change in the state of the system. Disorder is known as entropy.

Vikash said: (Sep 25, 2016)  
What is an adiabatic process?

Sravan Kumar said: (Jan 7, 2018)  
Here, it is not mentioned that the nozzle is convergent or divergent.

So however discharge or flow is constant in nozzle. And no heat transfer is taken place. So constant isentropic process.

Manyam said: (Jun 3, 2018)  
Entropy is the probability of occurrence of an energy state.

Aakash said: (Jul 13, 2019)  
Entropy is known as randomness and disorderness in molecules of the system.

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