[Michail]

Hi to all

I am going to solve test-case from ERCOFTAC database - Flow through Axisymmetric Expansions by by Stieglmeier et al. (1987) - http://cfd.mace.manchester.ac.uk/cgi...html&1&0&0&0&0

The question is - what kind of fluid they were using?

The question is - if it would be water at 30 C - then Reynolds number would be 1.56*10^5 not 10^4.

I an going to solve it with ANSYS Fluent.

Is there mistake with Re number or not?

If there is not mistakes with Re number, then if fluid has viscosity of water at 30C, then it lighter 10 times then water:

if:
U=2.51 m/s
L=0.05 m
Re= 1.56*10^4
------------------------
then kinematic visc = 8*10^(-6)

if
U=2.51 m/s
L=0.05 m
Re= 1.56*10^4
dinamic visc = 8*10^(-4) Pa*s
------------------------
then density=99.5


Please help!

Thanks in advance

[FMDenaro]

It seems some special fluid obtained by oils ...



"... mechanically present but optically transparent, facilitating the use of the laser Doppler anemometer for velocity measurements. The match of refractive indices was achieved by mixing two diesel oils with different refractive indexes in proportions suitable to yield the desired index of refraction. Since the refractive index is dependent on temperature, a heat exchanger was incorporated into the test loop to regulate the temperature to within ±0.5oC. Further details of all aspects of the experimental facility are described by Wieser and Nitsche (1987, 1988). "

[Michail]

Thank You!