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Reference heat capacity for Asteroid regolith from 10 to 1000K

Biele, Jens and Grott, Matthias (2018) Reference heat capacity for Asteroid regolith from 10 to 1000K. 49 Lunar and Plantery Science Conference, 19. - 23. März 2018, Woodlands, TX.

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Abstract

Introduction: Remote sensing in the mid-infrared allows the estimation of the thermal effusivity or ther- mal inertia Γ=(k(T)cp(T))1/2 of the surface material, with T absolute temperature, k thermal conductivity, ρ bulk density, and cp heat capacity at constant pressure in units of J/kgK. Knowledge or an estimate of cp(T) is required to extract, e.g., k(T), which in turn allows es- timation of grain sizes by applying models of heat transport in porous media [1-2]. While the temperature dependence of cp is a second-order effect at room temperature and does not strongly dependent on the chosen material (besides the mass fraction of metallic FeNi), cp shows very strong temperature and composition dependence at low tem- peratures. Heat capacity goes to zero as T approaches zero, and it is proportional to T³ at very low tempera- tures. It shows a slight linear increase as T approaches large values due to the difference cp – cv, as only cv obeys the 3R/atom Dulong-Petit limit.

Item URL in elib:https://elib.dlr.de/119435/
Document Type:Conference or Workshop Item (Speech)
Title:Reference heat capacity for Asteroid regolith from 10 to 1000K
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Biele, JensJens.Biele (at) dlr.deUNSPECIFIED
Grott, MatthiasMatthias.Grott (at) dlr.deUNSPECIFIED
Date:19 March 2018
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:heat capacity. Asteroid regolith
Event Title:49 Lunar and Plantery Science Conference
Event Location:Woodlands, TX
Event Type:international Conference
Event Dates:19. - 23. März 2018
Organizer:USRA
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Science and Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Erforschung des Weltraums
DLR - Research theme (Project):Vorhaben asteroids and comets
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
Deposited By: Herrmann, Astrid
Deposited On:06 Apr 2018 10:32
Last Modified:31 Jul 2019 20:17

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