CFD Online Logo CFD Online URL
Home > Forums > Main CFD Forum

Reynolds Experiments on Flow Stability

Register Blogs Members List Search Today's Posts Mark Forums Read

LinkBack Thread Tools Display Modes
Old   March 4, 2011, 07:03
Question Reynolds Experiments on Flow Stability
New Member
Join Date: Feb 2011
Posts: 2
Rep Power: 0
BerndHH is on a distinguished road
I donīt know if this is the right forum to post this question. Acheson describes in his book "Elementary Fluid Dynamics" in Section 9.1 Reynolds original experiment. Is anyone aware of experiments where a wall is installed behind the intake, the water removed from the basin and the pipe possible asymmetrically heated? I am looking for some pictures or movies from experiments.
BerndHH is offline   Reply With Quote

Old   March 7, 2011, 18:58
Senior Member
Join Date: Apr 2009
Posts: 129
Rep Power: 10
f-w is on a distinguished road
f-w is offline   Reply With Quote

Old   March 17, 2011, 16:13
Default Reynolds Paper
New Member
Join Date: Feb 2011
Posts: 2
Rep Power: 0
BerndHH is on a distinguished road
Sir George Stokes wrote in his review of Reynolds paper: "The author (Osborne Reynolds) says that as a result of this the equtions are true, and only true, as applied to fluid, in which the mean motion, excluding the heat motions, are steady."
Since the work of Reynolds, over hundred years ago, the onset of turbulence is related to the incompressible Navier-Stokes equations. It seems that already Osborne Reynolds realized that this assumption might not be correct.
Heisenberg wrote in the paper "The relevance of Sommerfelds work today" in 1969 in relation to the stability of laminar flow in fluids: "However, as far as I know, even today it is not known what is actually wrong in the work of Noether. "
The incompressible Navier-Stokes and the Reynolds equations are approximations to the full Navier-Stokes equations. In an icompressible flow the energy equation is only satisfied for a non vanishing Prandtl number, if temperature gradients can be excluded and the background flow is stationary. Similar remarks apply to the classical boundary layer theory of Prandtl, based on the incompressible Navier-Stokes equations.
I think the nature of the transition to turbulence in shear flows is related to the temperature in the transition layer. I am looking for experimental results which include temperature measurements to validate theoretical results.
BerndHH is offline   Reply With Quote


flow stability

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
plotting drag coefficient in low reynolds number flow past cylinder atmcfd FLUENT 0 January 2, 2010 09:34
Reynold's number and incompressible flow Neil Main CFD Forum 3 October 24, 2006 08:11
stability at high Mach number flow mike Main CFD Forum 0 July 2, 2004 18:41
Free Flow Reynolds Number bharath Main CFD Forum 0 November 21, 2002 16:37
Flow visualization vs. Calculated flow patterns Francisco Saldarriaga Main CFD Forum 1 August 2, 1999 23:18

All times are GMT -4. The time now is 12:49.