Discussion :: Fluid Mechanics - Section 1 (Q.No.2)
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Laminar flow of a Newtonion fluid ceases to exist, when the Reynolds number exceeds
Answer: Option B
No answer description available for this question.
|Niki said: (Jun 7, 2012)|
|For laminar flow, Re should be equal to or less than 2100.|
|Vishwas said: (Jun 28, 2012)|
|Laminar flow is less than or equal to 2100.|
|Chitta said: (Aug 16, 2012)|
|The above question doesn't mention about the system.
we have two type of value for laminar.
1. for circular pipe----- Re<= 2100
2. for flat plate ------- Re<= 5*10^5
|B.Nath said: (Dec 8, 2012)|
|For flow in a conduit:
Re<2100 Laminar Flow, Sheer Stress depends on viscosity but not on density.
2100<Re<4000 : Transient Flow
Re>4000 Turbulent flow depends on density.
|Jyoti said: (Mar 22, 2013)|
|This is true only in case of flow through pipes. we cannot generalize this for every case. Re num is different for every case.|
|Kalaivani said: (Aug 7, 2013)|
|For Laminar flow, Reynold's number is less than or equal to 1(Re <= 1).|
|Dhruvin Virani said: (Sep 17, 2013)|
|Laminar flow is less than or equal to 2100. And Re>4000 Turbulent flow.|
|Jayamsuba said: (Jul 24, 2014)|
|For open channel flow,
If Re <500 or 600. laminar
> 2000 or 2100. turbulent.
Here, Re=rho*v*R/mu...R=hydraulic gradient.
For circular pipe flow,
If Re <2000. laminar.
> 4000. turbulent.
Here, Re=rho*v*d/mu...d=dia of pipe.
Here both formulae are important to keep in mind. because sometime this may confuse you.
|Khawal said: (Sep 13, 2014)|
|Laminar flow is in linear motion and having re less than 2100, after increase the re the turbulence is so that velocity increase.|
|Rajisha said: (Dec 26, 2014)|
|Re below 2100 is laminar flow in case of circular pipes.|
|Surya Teja said: (Sep 14, 2016)|
|Let is assume the question is for circular pipe based on options given. But, the question is when will the Laminar flow cease? I think, once the fully turbulent flow is achieved, which is after crossing Re 4000. Then only we can say there is no laminar flow.|
|Mahone said: (Apr 19, 2017)|
|For circular pipes, the Reynolds number is used to classify flows as follows.
<2000 laminar flow.
2000-4000. Transitional flow.
>4000 turbulent flow.
|Sanjeev Gupta said: (Oct 19, 2019)|
|Laminar flow equal and less than 2100 Reynolds number.|
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