Mechanical Engineering - Hydraulics and Fluid Mechanics - Discussion
Discussion Forum : Hydraulics and Fluid Mechanics - Section 2 (Q.No. 2)
2.
The velocity corresponding to Reynold number of 2800, is called
Discussion:
27 comments Page 1 of 3.
Naveenkumar T said:
8 years ago
If Re <2000, tts laminar flow.
If Re > 4000 its turbulent flow.
If between 2000 to 4000 its transition flow.
The velocity at which flow changes from laminar to transition is called LOWER CRITICAL.
VELOCITY and that at which transition changes to turbulent is called UPPER CRITICAL VELOCITY.
If Re > 4000 its turbulent flow.
If between 2000 to 4000 its transition flow.
The velocity at which flow changes from laminar to transition is called LOWER CRITICAL.
VELOCITY and that at which transition changes to turbulent is called UPPER CRITICAL VELOCITY.
Sarath said:
6 years ago
When Reynold's number is between 2000 and 2800, the flow is neither laminar nor turbulent. The velocity corresponding to Reynold's number of 2000, is called lower critical velocity and the velocity corresponding to Reynold's number of 2800, is called higher critical velocity.
(5)
Denish said:
10 years ago
It is right if Re>2000 then it is called critical but this is true only when flow through pipe. But for different flow conditions Re. Value are different. In this question they have not mention any type of conditions then how we can decide the right answer.
Aakash said:
8 years ago
Raynold number = 2800 shows that flow is changing from the transition to turbulent and for this kind of flow, velocity is termed as upper critical velocity.
When flow changes from laminar to transition velocity is termed as lower critical velocity.
When flow changes from laminar to transition velocity is termed as lower critical velocity.
Aakash said:
8 years ago
Raynold number = 2800 shows that flow is changing from the transition to turbulent and for this kind of flow, velocity is termed as upper critical velocity.
When flow changes from laminar to transition velocity is termed as lower critical velocity.
When flow changes from laminar to transition velocity is termed as lower critical velocity.
Prasad said:
1 decade ago
There is no relation between mach number and Reynolds number,
Mach number is used to measure the speed of sound waves and Reynolds number is used to measure the type of the flow.
Mach number is the ratio of flow velocity to the speed of light.
Mach number is used to measure the speed of sound waves and Reynolds number is used to measure the type of the flow.
Mach number is the ratio of flow velocity to the speed of light.
Kamal said:
5 years ago
Re<2000 laminar flow, Re>4000 turbulent flow. So it is 2800 turbulent flow high critical energy.
Mach no<1 subsonic flow, Mach no=1 sonic flow, Mach no>1 supersonic flow special case Mach no.
1to6 hypersonic flow.
Mach no<1 subsonic flow, Mach no=1 sonic flow, Mach no>1 supersonic flow special case Mach no.
1to6 hypersonic flow.
(4)
Tagese said:
8 years ago
@Girish Changavi, It should be
If Re <2000, tts laminar flow.
If Re > 4000 its turbulent flow.
If between 2000 to 4000 its transition flow.
Here Re is 2800, so it's not higher critical velocity.
If Re <2000, tts laminar flow.
If Re > 4000 its turbulent flow.
If between 2000 to 4000 its transition flow.
Here Re is 2800, so it's not higher critical velocity.
Rahul said:
10 years ago
Lower Critical Rn value for Circular Pipes = 2000.
Higher Critical Rn Value for circular Pipes = 4000.
The answer for given question should be in transition i.e. neither lower nor higher velocity.
Higher Critical Rn Value for circular Pipes = 4000.
The answer for given question should be in transition i.e. neither lower nor higher velocity.
Shobhit kumar said:
1 decade ago
When mech number <1 the flow is sub sonic.
When mech number =1 the flow is sonic.
When mech number lies between 1 to 6 the flow is supersonic.
When mech number >6 the flow is hyper-sonic.
When mech number =1 the flow is sonic.
When mech number lies between 1 to 6 the flow is supersonic.
When mech number >6 the flow is hyper-sonic.
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