CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > General Forums > Main CFD Forum

turbulent mixing of two fluids

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   October 9, 1999, 08:00
Default turbulent mixing of two fluids
  #1
ulrich bieder
Guest
 
Posts: n/a
hi there

i want to model the mixing of two fluids in a tube bend. the fluids have the same density but very different molecular viscosities. the flow is turbulent (Re about 5000).

in fact, i want to solve the problem by using a two fluid model, i.e. i will use two momentum equtions, one mass transport equation and one continuity equation. however, i think that a turbulent viscosity which is calculated independently for each fluid will not lead to correct results.

i would be glad is someone who has already modeled this problem can give me some advise how to model physically corret the mixing of two fluids.

thanks in advance

ulrich
  Reply With Quote

Old   October 9, 1999, 14:57
Default Re: turbulent mixing of two fluids
  #2
Md. Ziaul Islam
Guest
 
Posts: n/a
You are working in a complex area. No wonder you are kind of lost! Let me give you some references for you--

McMurtry, P.A., Jou, W.-H., Riley, J.J. and Metcalfe, R.W. "Direct Numerical Simulations of a

Reacting Mixing Layer with Chemical Heat Release," AIAA Journal, 24, pp. 962-970, 1986.

McMurtry, P.A., Riley J.J., and Metcalfe, R.W. "Effects of Heat Release on the Large Scale

Structures in a Turbulent Reacting Mixing Layer," Journal of Fluid Mechanics, 199, pp. 297-332,

1989.

Son, S.F., McMurtry, P.A., and Queiroz, M. "The Effects of Heat Release on Various Statistical

Properties of a Reacting Shear Layer," Combustion and Flame, 85, pp. 51-67, 1991.

McMurtry, P.A. and Givi, P. "Direct Numerical Simulations of a Reacting, Turbulent Mixing Layer

By A Pseudospectral-Spectral Element Method," Finite Element Methods in Fluids, 8, pp. 355-378,

1992.

McMurtry, P.A., Menon, S. and Kerstein, A.R. "A Linear Eddy Subgrid Model for Turbulent

Reacting Flows: Application to Hydrogen-Air Combustion,"Proceeding of the 24th (International)

Symposium on Combustion, the Combustion Institute, pp. 271-278, 1992.

McMurtry, P.A., Gansauge, T. and Kerstein, A.R "Linear Eddy Simulations of Mixing and Reaction

in A Homogeneous Turbulent Flow," Phys. Fluids A, 5, pp. 1023-1034, 1993.

McMurtry, P.A. and Menon, S. "Linear Eddy Simulations of Turbulent Combustion," J. Energy &

Fuels, 7, pp. 817-826, 1993.

Kerstein, A.R. and McMurtry, P.A. "Mean-Field Theories of Random Advection," Physical Review

E, 49, pp. 474-482, 1994.

Cremer, M., McMurtry, P.A., and Kerstein, A.R. "Effects of Turbulent and Scalar Length-Scale

Distributions on Turbulent Mixing Processes," Phys. Fluids A, 6, pp. 2143-2153, 1994.

Kerstein, A.R. and McMurtry, P.A. "Low Wavenumber Statistics of Randomly Advected Passive

Scalars," Physical Review E, 50, pp. 2057-2063, 1994.

Kerstein, A.R., Cremer, M.A. and McMurtry, P.A. "Scaling Properties of Differential Molecular

Diffusion Effects in Turbulence," Physics of Fluids, 7, pp. 1999-2007, 1995.

Guilkey, J.E., Gee, K.R., McMurtry, P.A. and Klewicki, J.C. "Use of Caged Fluorescent Dyes for

the Study of Turbulent Passive Scalar Mixing," Experiments in Fluids, 21, pp. 237-242, 1996.

McMurtry, P.A. "Turbulence," in Encyclopedia of Climate and Weather, pp. 786-793, Oxford

University Press, 1996.

Guilkey, J.E., Kerstein, A.R., McMurtry, P.A. and Klewicki, J.C. "Long-tailed Probability

Distribution Functions in Turbulent Pipe Flow Mixing," Physical Review E, 56, (2), 1753, 1997.

Krueger, S.K., Su, C.-W., and McMurtry, P.A. "Modeling Entrainment and Fine- Scale mixing in

Cumulus Clouds," Journal of the Atmospheric Sciences, 54, 2697- 2712, 1997.

Maynes, D., Klewicki, J.C., McMurtry, P.A. and Robey, H. "Hydrodynamic Scalings in the Rapid

Growth of Crystals From Solution," J. Crystal Growth, 178, 545-558, 1997.

Maynes, D., Klewicki, J.C., McMurtry, P.A. "Time Resolved Torque of Rotating Bluff Bodies in a

Cylindrical Tank," J. Fluids Eng., 120, 23-28, 1998.

Su, C-W., Krueger, S.K., McMurtry, P.A. and Austin, P.H., "Linear Eddy Modeling of Droplet

Spectral Evolution During Entrainment and Mixing in Cumulus Clouds," Atmospheric Research, 47,

41--58, 1998.

Cremer, M. and McMurtry, P.A. "A Model of Turbulent Mixing and Reaction for H2- air

Combustion," Journal of Propulsion and Power, 14, 3, 309--317, 1998.

  Reply With Quote

Old   October 9, 1999, 17:15
Default Re: turbulent mixing of two fluids
  #3
John C. Chien
Guest
 
Posts: n/a
(1). In the mixing zone, the turbulent Reynolds number will be of O(100) or less. (2). So, I don't think the difference in the molecular viscosity between two fluid is important in the mixing process.
  Reply With Quote

Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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 Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Turbulent eddy diffusivity for mixing?? Ray Main CFD Forum 3 November 5, 2020 12:57
two mixing compresible fluids solver ziemowitzima OpenFOAM Running, Solving & CFD 27 August 13, 2020 13:40
Turbulent flow of two incompressible fluids with the same physical properties ArneBab OpenFOAM Running, Solving & CFD 3 January 5, 2010 06:48
FIDAP-Properties Definition in Fluids Mixing Area Q. Hao FLUENT 0 February 17, 2005 13:00
Re: turbulent mixing of two fluids Jin Wook LEE Main CFD Forum 0 October 11, 1999 07:38


All times are GMT -4. The time now is 11:01.