Question

Match List-1 with List-2 and select the correct answer using the codes given below the lists:
List-1
A. ${\left(\frac{\partial u}{\partial y}\right)}_{y=0}$ is zero
B. ${\left(\frac{\partial u}{\partial y}\right)}_{y=0}$ is +ve
C. Displacement thickness
D. Momentum thickness

List-2
1. The flow is attached flow
2. The flow is on the verge of separation
3. ${\int }_0^{\delta }\frac{u}{U}(1-\frac{u}{U})dy$
4. ${\int }_0^{\delta }(1-\frac{u}{U})dy$

• A. A-1, B-2, C-3, D-4
• B. A-2, B-1, C-3, D-4
• C. A-1, B-2, C-4, D-3
• D. A-2, B-1, C-4, D-3

Answer 1

The correct option is D A-2, B-1, C-4, D-3

The point of seperation is defined as the limit between forward and reverse flow in the layer very close to the wall, ${\left(\frac{\partial u}{\partial y}\right)}_{y=0}=0.$
The minimum pressure occur little upstream of stagnation point.