Matched index of refraction flow facility
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Matched Index of Refraction (or MIR) is a facility located at the Idaho National Laboratory built in the 1990s. The purpose of the fluid dynamics experiments in the MIR flow system at Idaho National Laboratory (INL) is to develop benchmark databases for the assessment of Computational Fluid Dynamics (CFD) solutions of the momentum equations, scalar mixing, and turbulence models for the flow ratios between coolant channels and bypass gaps in the interstitial regions of typical prismatic standard fuel element or upper reflector block geometries of typical Very High Temperature Reactors (VHTR) in the limiting case of negligible buoyancy and constant fluid properties.
How It Works
MIR uses Doppler Velocimetry to produce a three-dimensional image of a model inside the loop. To do this, the loop circulates about 3500 gallons of semi-transparent mineral oil similar to baby oil. Special quartz models, built to scale, are inserted into the loop near the observation equipment. MIR is capable of analyzing a variety of models, including the interior of nuclear reactor cores.
The purpose of MIR is to allow researchers to analyze a model’s fluid properties; how its structure interacts with the flow of air, water or another fluid medium through and/or around it. In this way, MIR is somewhat comparable to a wind-tunnel. The information MIR can provide is valuable to researchers who want to evaluate a design.
Once the oil is flowing and is held at a very specific temperature, the oil takes on the same refractory properties as the quartz model. This allows researchers and instruments to see clearly what’s going on with the flow inside the model. Researchers may add small particles to the oil to help them detect flow patterns, or may simply depend on impurities in the oil.
Current Experiments Involving MIR
The MIR VHTR Bypass Flow Experiment will measure flow characteristics in the coolant channels and interstitial gaps between typical prismatic block standard fuel elements or upper reflector blocks. The experiments use optical techniques, primarily particle image velocimetry (PIV) in the INL MIR flow system. The benefit of the MIR technique is that it permits optical measurements to determine flow characteristics in passages and around objects to be obtained without locating a disturbing transducer in the flow field and without distortion of the optical paths. Unheated MIR experiments are first steps when the geometry is complicated. 
3-D Laser Doppler Velocimetry system
Present system is 2-D
High-speed/High-resolution 3-D Particle Image Velocimetry system
Up to 1 kHz frame rate (present system is capable 2–3 Hz standard or 15 Hz up to limit of RAM)
4.2 MP resolution (present system is 1.92 MP resolution)
Planar laser induced fluorescence (PILF) system 
These are the men who helped make MIR possible.
Ref: Becker, S., Stoots, C.M., Condie, K.G., Durst, F. and McEligot, D.M., 2002, “LDA-Measurements of Transitional Flows Induced by a Square Rib,” J. Fluids Eng., 124, March 2002, pp. 108–117.
Ref: Condie, K.G., McCreery, G.E. and McEligot, 2001, “Measurements of Fundamental Fluid Physics of SNF Storage Canisters,” INEEL/EXT-01-01269, September 2001.
Ref: McEligot, D.M., McCreery, G.E., Pink, R.J, Barringer, C. and Knight, K.J., 2001, “Physical and Computational Modeling for Chemical and Biological Weapons Airflow Applications,” INEEL/CON-02-00860, November 2001.
Ref: McEligot, D.M., Condie, K.G., Foust, T.D., Jackson, J.D., Kunugi, T., McCreery, G.E., Pink, R.J., Pletcher, R.H., Satake, S.I., Shenoy, A., Stacey, D.E.,
Vukoslavcevic, P. and Wallace, J.M., 2002, Fundamental Thermal Fluid Physics of High Temperature Flows in Advanced Reactor Systems,” INEEL-EXT-2002-1613, December 2002.
Ref: McEligot, D.M., Condie, K.G., McCreery, G.E., Hochreiter, L.E., Jackson, J.D., Pletcher, R.H., Wallace, J.M., Yoo, J.Y., Ro, S.T., Lee, J.WS. and Park, S.O., 2003, “Advanced Computational Thermal Fluid Physics (CTFP) and its Assessment for Light Water Reactors and Supercritical Reactors,” INEEL-EXT03-01215 Rev 5, December 2003.
Ref: McIlroy, H. M. Jr., 2004, “The Boundary Layer Over Turbine Blade Models with Realistic Rough Surfaces,” PhD Dissertation, University of Idaho, December 2004.
Ref: Shuster, J.M., Pink, R.J., McEligot, D.M. and Smith, D.R., 2005, “Interaction of a Circular Synthetic Jet with a Cross-Flow Boundary Layer,” 35th AIAA paper 2005-4749, Fluid Dynamics Conference and Exhibit, 6–9 June 2005, Toronto, CA.
Ref: McIlroy, H. M. Jr., McEligot, D. M., and Pink, R. J., “Measurement of Flow Phenomena in a Lower Plenum Model of a Prismatic Gas-Cooled Reactor,” J. of Eng. for Gas Turbines & Power, 132, Feb. 2010, pp. 022901–1 – 022901-7.
Ref: Wilson, B.M., Smith, B.L., Spall, R. and McIlroy, H.M. Jr., 2009, “A Non-Symmetrical Swirling Jet as an Example of a highly Model-able Assessment Experiment,” ICONE17-75362, Proceedings of ICONE17 2009, 17th International Conference on Nuclear Engineering
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- "Log In". inlportal.inl.gov. Retrieved April 19, 2014.
- "Matching index of refraction using a diethyl phthalate/ethanol solution for in vitro cardiovascular models - Springer". Experiments in Fluids. 41: 375–381. doi:10.1007/s00348-006-0146-5. Retrieved April 19, 2014.
- "MIR Current Experiments". inlportal.inl.gov. Retrieved April 19, 2014.
- "INL". inl.gov. Retrieved April 19, 2014.
- "Matched Index of Refraction Technique". inlportal.inl.gov. Retrieved April 19, 2014.