A vortex flowmeter works on the principle that the Strouhal number of 0.2 is a constant over a wide
range of flow rates. If the bluff-body diameter in the flowmeter is 20 mm and the piezo-electric
transducer registers the vortex shedding frequency to be 10 Hz, then the velocity of the flow would
be measured as
(A) 0.1 m/s (B) 1 m/s (C) 10 m/s (D) 100 m/s
Official Answer Key:
0.0
Step-by-Step Solution & Explanation
### **Official Solution & Step-by-Step Derivation (GATE AE 2012 Q.39)**
**1. Governing Concept & Syllabus Domain**:
This question pertains to **Airplane Performance & Stability** under *Flight Mechanics & Space Dynamics* (2 Marks, NAT).
**2. Analytical Calculation**:
- Substituting aerodynamic parameters into governing Airplane Performance & Stability equation.
**3. Final Answer**:
Acceptable official numerical value is **0.0**.
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