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Isentropic flow is
  • a)
    Irreversible adiabatic flow
  • b)
    Reversible adiabatic flow
  • c)
    Ideal fluid flow
  • d)
    Frictionless reversible flow
Correct answer is option 'B'. Can you explain this answer?
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Verified Answer
Isentropic flow isa)Irreversible adiabatic flowb)Reversible adiabatic...
An isentropic process is also known as a reversible adiabatic process.
If the process is reversible and adiabatic: dQrev = 0 ⇒ dS = 0
Entropy analysis for a closed system:
Case 1: For an internally reversible process (δs)gen = 0
When heat is added to the system ⇒ (δQ) = +ve ⇒ ds = +ve
When heat is rejected from the system ⇒ (δQ) = -ve ⇒ ds = -ve
For adiabatic process ⇒ (δQ) = 0 ⇒ ds = 0 (ISENTROPIC)
Case 2: For internally irreversible process (δs)gen ≠ 0 ⇒ (δs)gen = +ve
When heat is added to the system ⇒ (δQ) = +ve ⇒ ds = +ve
When heat is rejected from the system ⇒ (δQ) = -ve ⇒ ds = -ve or +ve or zero
​Since (δs)gen = +ve and (δQ) = -ve so change in entropy, ds can be zero is (δQ/T) = δs)gen. In this case, the process will be ISENTROPIC
For adiabatic process ⇒ (δQ) = 0 ⇒ ds = +ve
Thus for a process to be isentropic, there are two cases:
Reversible adiabatic process
The irreversible process where (δQ/T) = δs)gen
Note: Irreversible adiabatic process is not an isentropic process.
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Most Upvoted Answer
Isentropic flow isa)Irreversible adiabatic flowb)Reversible adiabatic...
Reversible Adiabatic Flow:
Isentropic flow is characterized by being reversible and adiabatic. Let's break down these terms to understand why isentropic flow is classified as reversible adiabatic flow.

Reversible Flow:
Reversible flow refers to a flow process in which there are no irreversible losses of energy. This means that the flow is able to be reversed without any energy losses. In isentropic flow, the process is reversible, meaning that the flow can be reversed without any loss of energy.

Adiabatic Flow:
Adiabatic flow refers to a flow process in which there is no heat transfer between the system and its surroundings. This implies that the process is adiabatic, meaning that there is no heat exchange during the flow. In isentropic flow, the process is adiabatic, indicating that there is no heat transfer involved.
Therefore, isentropic flow is classified as reversible adiabatic flow because it is both reversible (no irreversible losses of energy) and adiabatic (no heat transfer). This type of flow is ideal for certain fluid dynamics calculations and is commonly used in thermodynamics and aerospace engineering.
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Isentropic flow isa)Irreversible adiabatic flowb)Reversible adiabatic flowc)Ideal fluid flowd)Frictionless reversible flowCorrect answer is option 'B'. Can you explain this answer?
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