Discussion
The change over from laminar to turbulent flow during sedimentation by water at 20°C takes place at a critical Reynolds Number of around ...................
Answer: B
The changeover occurs at a critical Reynolds number of around 500.
The Reynolds number compares inertial to viscous forces, \(Re = \rho V L/\mu\). For flow in open channels, as in sediment transport, the flow is laminar below about 500 and becomes turbulent above it, with a transitional range above that. (For pipe flow, using diameter as the length scale, the familiar figure is about 2,000.)
300 is still in the laminar range, while 700 and 900 lie beyond the critical value usually quoted for open-channel flow.
No comment is present. Be the first to comment.
Loading…
Post your comment
Please log in or register to post a comment.
Examination Categories
- SSC Exams
- Banking Exams
- Teaching Exams
- Civil Services Exams
- Railways Exams
- Engineering Recruitment Exams
- Defence Exams
- State Government Exams
- Police Exams
- Insurance Exams
- Nursing Exams
- Other Government Exams
- NRA CET
- PG Entrance Exams
- Campus Placement
- MBA Entrance Exams
- CUET and UG Entrance
- Judiciary Exams
- Regulatory Body Exams
- Software Development