For a two-dimensional incompressible flow over a flat plate, the laminar boundary
layer thickness at a distance x from the leading edge is 𝛿. If Rex is the Reynolds
number defined based on length scale x, (
𝛿
x) is proportional to ______.
Options:
(A) Rex
-1/2
(B) Rex
-1
(C) Rex
-3/2
(D) Rex
-2
Official Answer Key:
A
Step-by-Step Solution & Explanation
### **Official Solution & Step-by-Step Derivation (GATE AE 2025 Q.17)**
**1. Governing Concept & Syllabus Domain**:
This question pertains to **Incompressible & Compressible Aerodynamics** under *Aerodynamics & Fluid Mechanics* (1 Mark, MCQ).
**2. Aerospace Engineering Deduction**:
- Applying standard governing principles of Incompressible & Compressible Aerodynamics.
- Option **(A)** matches the analytical derivation and official criteria.
**3. Final Answer**:
Correct Option is **(A)**.
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