Question:
In case of liquid flowing on horizontal surface the flow of liquid becomes unsteady, when Reynolds number \(R_{n}\) is
In case of liquid flowing on horizontal surface the flow of liquid becomes unsteady, when Reynolds number \(R_{n}\) is
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Recall the standard Reynolds number ranges for streamline, unsteady and turbulent flow.
Updated On: Nov 12, 2026
- less than \(499\)
- between \(500\) to \(999\)
- between \(1000\) to \(2000\)
- greater than \(2001\)
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The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept
The Reynolds number \(R_n\) decides the nature of flow in a liquid.
Step 2: Ranges
For \(R_n\) below about 1000 the flow is streamline (steady).
For \(R_n\) above about 2000 the flow is turbulent.
Step 3: Intermediate range
Between 1000 and 2000 the flow is neither steady nor fully turbulent, so it is unsteady.
Final Answer:
The flow becomes unsteady when Reynolds number lies between 1000 and 2000. \[ \boxed{\text{(C) }\text{between }1000\text{ to }2000} \]
The Reynolds number \(R_n\) decides the nature of flow in a liquid.
Step 2: Ranges
For \(R_n\) below about 1000 the flow is streamline (steady).
For \(R_n\) above about 2000 the flow is turbulent.
Step 3: Intermediate range
Between 1000 and 2000 the flow is neither steady nor fully turbulent, so it is unsteady.
Final Answer:
The flow becomes unsteady when Reynolds number lies between 1000 and 2000. \[ \boxed{\text{(C) }\text{between }1000\text{ to }2000} \]
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