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Hydrogen-Water Mixtures in Giant Planet Interiors Studied with Ab Initio Simulations

By SpaceRef Editor
October 28, 2015
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Hydrogen-Water Mixtures in Giant Planet Interiors Studied with Ab Initio Simulations

Francois Soubiran, Burkhard Militzer
(Submitted on 26 Oct 2015)

We study water-hydrogen mixtures under planetary interior conditions using ab initio molecular dynamics simulations. We determine the thermodynamic properties of various water-hydrogen mixing ratios at temperatures of 2000 and 6000 K for pressures of a few tens of GPa. These conditions are relevant for ice giant planets and for the outer envelope of the gas giants. We find that at 2000 K the mixture is in a molecular regime, while at 6000 K the dissociation of hydrogen and water is important and affects the thermodynamic properties. We study the structure of the liquid and analyze the radial distribution function. We provide estimates for the transport properties, diffusion and viscosity, based on autocorrelation functions. We obtained viscosity estimates of the order of a few tenths of mPa.s for the conditions under consideration. These results are relevant for dynamo simulations of ice giant planets.

Comments: 5 pages, 7 figures, Proceeding of HEDLA 2014. Published in HEDP
Subjects: Earth and Planetary Astrophysics (astro-ph.EP)
Journal reference: HEDP, Vol 17 (2015) pp 157-161
DOI: 10.1016/j.hedp.2014.10.005
Cite as: arXiv:1510.07689 [astro-ph.EP] (or arXiv:1510.07689v1 [astro-ph.EP] for this version)
Submission history
From: François Soubiran
[v1] Mon, 26 Oct 2015 21:19:46 GMT (88kb)
http://arxiv.org/abs/1510.07689

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