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SODI DCMIX

Brief Summary

DCMIX experiments take place in SODI. DCMIX is supporting research to determine diffusion coefficients of ternary fluid mixture samples, which could lead to a better understanding of mixtures processes. Some of those mixtures have a high scientific and industrial interest and their study could lead to refine petroleum reservoir models to help lead to more efficient extraction of oil resources.

Significant Dates

  • November 26th, 2013 Expedition 38, NASA astronaut Michael Hopkins install and activate SODI for DCMIX-2.
  • February 7th, 2014. DCMIX-2 uninstallation after successful experiment DCMIX-2 campaign.

Experiment/Payload description

Diffusive processes are everywhere in daily life and play a key role in the fluid mixtures. Diffusion is the relative motion of a species with respect to the other and can be caused by difference in concentration or temperature and also by a potential gradient. Reduced gravity environment is essential for accurate diffusion coefficients measurement.

dcmix in ISS

Source:NASA

The DCMIX purpose is:

  1. 1.Measure diffusion coefficient of ternary systems that are representative of a family of fluids.
  2. Validate measurement techniques used by industry.

  3. Refine numerical models of mixtures.

  4. Refine and obtain mixing rules allowing to predict diffusion coefficients.


DCMIX experiment is performed in cell arrays each composed of six cells: five “primary” (experiment) cells are probed by a movable Mach-Zehnder interferometer at two wavelength, while the “companion” (reference) cell is probed at a single wavelength.