2 Marks
2 Marks
2 Marks
Shadowgraph method:
Shadowgraph method
depends upon the second derivative.
This method beautifully
brings out the rapid changes in the index of
refraction.
Simple system and wider
possible applications.
9. What are the advantages of flow
visualization methods?
flow.
Anemometer.
16. Define Reynolds number.
Ratio between inertia force and viscous force is known as Reynolds number.
17. Define critical Reynolds number.
The critical Reynolds number is one in which the flow field is a mixture of laminar and
turbulent flows.
18. What are the limitations of intrusive flow diagnostics techniques?
PIV method in general not be able to measure along Z-axis.
The fluid velocity or the size of the experimental has to be changes due to changes in
Reynolds number.
Sensors are range dependent.
19. What are the limitations in dye injection flow visualization method?
If this method continued over a extended period of time, it will saturate the liquid in the
apparatus and the dye visibility would detoriate.
Not applicable for rapid turbulent flow since it has low molecular diffusivity.