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Knowledge Gaps in our Understanding of the Mechanisms Governing Heat Transport in Regolith at Low Temperatures

Biele, Jens and Knollenberg, Jörg and Grott, Matthias (2022) Knowledge Gaps in our Understanding of the Mechanisms Governing Heat Transport in Regolith at Low Temperatures. COSPAR 2022 44th Scientific Assembly, 2022-07-16 - 2022-07-24, Athen, Griechenland.

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Permanently shadowed areas (PSAs) on, e.g., the Moon or Mercury, can show surface temperatures down to 30 K (Martinez & Siegler 2021) and can act as cold traps for water ice. At such cryogenic temperatures, water ice will be stable over geological timescales and PSAs are therefore of high interest for in-situ resource utilization (ISRU) efforts due to the potential of finding stable ice in the shallow subsurface. To better understand the ice deposition process and to better predict water ice stability, reliable models using realistic material parameters are needed. At cryogenic temperatures (<80 or 90 K), the conventional assumptions on thermophysical properties of regolith for the description of thermal transport break down. Notably specific heat capacity cp and effective thermal conductivity, keff will differ significantly from their values at 250 K. In addition, the thermal conductivity of the matrix material can change very significantly. However, at low temperatures, the heat transport process through this mixture of crystalline and amorphous components is not well understood. For example, crystalline grains at low T can have a solid thermal conductivity orders of magnitude higher than amorphous (glassy) particles; it is not clear how to combine the components in a mix of crystalline and amorphous grains.

Item URL in elib:https://elib.dlr.de/187662/
Document Type:Conference or Workshop Item (Speech)
Title:Knowledge Gaps in our Understanding of the Mechanisms Governing Heat Transport in Regolith at Low Temperatures
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Biele, JensUNSPECIFIEDhttps://orcid.org/0000-0002-7414-829XUNSPECIFIED
Grott, MatthiasUNSPECIFIEDhttps://orcid.org/0000-0002-8613-7096UNSPECIFIED
Date:July 2022
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Event Title:COSPAR 2022 44th Scientific Assembly
Event Location:Athen, Griechenland
Event Type:international Conference
Event Start Date:16 July 2022
Event End Date:24 July 2022
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 , Köln-Porz
Institutes and Institutions:Space Operations and Astronaut Training > User center for space experiments (MUSC)
Institute of Planetary Research > Planetary Physics
Institute of Planetary Research > Planetary Sensor Systems
Deposited By: Herrmann, Astrid
Deposited On:28 Jul 2022 11:16
Last Modified:24 Apr 2024 20:49

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