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Water-rock differentiation of icy bodies by Darcy law, Stokes law and two-phase flow

Neumann, Wladimir and Breuer, Doris and Spohn, Tilman (2016) Water-rock differentiation of icy bodies by Darcy law, Stokes law and two-phase flow. Cambridge University Press. XXIX IAU General Assembly, Honolulu, HI, USA. doi: 10.1017/S174392131600301X.

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Official URL: https://www.cambridge.org/core/journals/proceedings-of-the-international-astronomical-union/article/waterrock-differentiation-of-icy-bodies-by-darcy-law-stokes-law-and-twophase-flow/2D07369DC111DFDE9BAB289D7B71B07C


The early Solar system produced a variety of bodies with different properties. Among the small bodies, objects that contain notable amounts of water ice are of particular interest. Water-rock separation on such worlds is probable and has been confirmed in some cases. We couple accretion and water-rock separation in a numerical model. The model is applicable to Ceres, icy satellites, and Kuiper belt objects, and is suited to assess the thermal metamorphism of the interior and the present-day internal structures. The relative amount of ice determines the differentiation regime according to porous flow or Stokes flow. Porous flow considers differentiation in a rock matrix with a small degree of ice melting and is typically modelled either with the Darcy law or two-phase flow. We find that for small icy bodies two-phase flow differs from the Darcy law. Velocities derived from two-phase flow are at least one order of magnitude smaller than Darcy velocities. The latter do not account for the matrix resistance against the deformation and overestimate the separation velocity. In the Stokes regime that should be used for large ice fractions, differentiation is at least four orders of magnitude faster than porous flow with the parameters used here.

Item URL in elib:https://elib.dlr.de/107097/
Document Type:Conference or Workshop Item (Poster)
Title:Water-rock differentiation of icy bodies by Darcy law, Stokes law and two-phase flow
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Neumann, WladimirUNSPECIFIEDhttps://orcid.org/0000-0003-1932-602XUNSPECIFIED
Breuer, DorisUNSPECIFIEDhttps://orcid.org/0000-0001-9019-5304UNSPECIFIED
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Page Range:pp. 261-266
Publisher:Cambridge University Press
Series Name:Proceedings of the International Astronomical Union
Keywords:Dwarf planets, Asteroids, Planetesimals, Differentiation, Accretion, Ceres
Event Title:XXIX IAU General Assembly
Event Location:Honolulu, HI, USA
Event Type:international Conference
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Space Exploration
DLR - Research theme (Project):R - Exploration of the Solar System
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Physics
Institute of Planetary Research > Leitungsbereich PF
Deposited By: Neumann, Wladimir
Deposited On:03 Dec 2020 08:40
Last Modified:03 Dec 2020 08:40

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