Controlling soil disturbance of a lunar regolith simulant bed during depressurization in a vacuum chamber

Abstract A dusty thermal vacuum chamber (DTVC) containing a regolith simulant bed is essential for testing equipment and techniques related to lunar surface exploration. Space agencies have been reluctant to operate a DTVC because of the challenge of controlling soil disturbance of the lunar regolit...

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Autores principales:	Gyu-Hyun Go, Jangguen Lee, Taeil Chung, Byung Hyun Ryu, Hyunwoo Jin, Li Zhuang, Hyu Soung Shin, Jae Hyun Kim, Tae Sup Yun
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/ed77a2f1bda44910acfe5817d25f2200
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spelling	oai:doaj.org-article:ed77a2f1bda44910acfe5817d25f22002021-12-02T15:23:39ZControlling soil disturbance of a lunar regolith simulant bed during depressurization in a vacuum chamber10.1038/s41598-021-81317-12045-2322https://doaj.org/article/ed77a2f1bda44910acfe5817d25f22002021-01-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-81317-1https://doaj.org/toc/2045-2322Abstract A dusty thermal vacuum chamber (DTVC) containing a regolith simulant bed is essential for testing equipment and techniques related to lunar surface exploration. Space agencies have been reluctant to operate a DTVC because of the challenge of controlling soil disturbance of the lunar regolith simulant bed during pumping down or depressurization, which may contaminate or even damage the chamber and vacuum equipment. There appears to be no previously available solution to this problem, or how to avoid it. We investigated the mechanism of soil disturbance during depressurization and established a criterion for evaluating its occurrence. The proposed criterion was validated by extensive experiments and numerical modelling to simulate air evacuation from soil voids. There is a critical pressure difference (CPD) between the top and bottom of the lunar regolith simulant bed that causes soil disturbance during depressurization. We found a simple equation estimating the CPD and further provided guideline on the optimum depressurization rate to avoid soil disturbance before the target vacuum level is achieved under varying soil conditions.Gyu-Hyun GoJangguen LeeTaeil ChungByung Hyun RyuHyunwoo JinLi ZhuangHyu Soung ShinJae Hyun KimTae Sup YunNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-8 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Gyu-Hyun Go Jangguen Lee Taeil Chung Byung Hyun Ryu Hyunwoo Jin Li Zhuang Hyu Soung Shin Jae Hyun Kim Tae Sup Yun Controlling soil disturbance of a lunar regolith simulant bed during depressurization in a vacuum chamber
description	Abstract A dusty thermal vacuum chamber (DTVC) containing a regolith simulant bed is essential for testing equipment and techniques related to lunar surface exploration. Space agencies have been reluctant to operate a DTVC because of the challenge of controlling soil disturbance of the lunar regolith simulant bed during pumping down or depressurization, which may contaminate or even damage the chamber and vacuum equipment. There appears to be no previously available solution to this problem, or how to avoid it. We investigated the mechanism of soil disturbance during depressurization and established a criterion for evaluating its occurrence. The proposed criterion was validated by extensive experiments and numerical modelling to simulate air evacuation from soil voids. There is a critical pressure difference (CPD) between the top and bottom of the lunar regolith simulant bed that causes soil disturbance during depressurization. We found a simple equation estimating the CPD and further provided guideline on the optimum depressurization rate to avoid soil disturbance before the target vacuum level is achieved under varying soil conditions.
format	article
author	Gyu-Hyun Go Jangguen Lee Taeil Chung Byung Hyun Ryu Hyunwoo Jin Li Zhuang Hyu Soung Shin Jae Hyun Kim Tae Sup Yun
author_facet	Gyu-Hyun Go Jangguen Lee Taeil Chung Byung Hyun Ryu Hyunwoo Jin Li Zhuang Hyu Soung Shin Jae Hyun Kim Tae Sup Yun
author_sort	Gyu-Hyun Go
title	Controlling soil disturbance of a lunar regolith simulant bed during depressurization in a vacuum chamber
title_short	Controlling soil disturbance of a lunar regolith simulant bed during depressurization in a vacuum chamber
title_full	Controlling soil disturbance of a lunar regolith simulant bed during depressurization in a vacuum chamber
title_fullStr	Controlling soil disturbance of a lunar regolith simulant bed during depressurization in a vacuum chamber
title_full_unstemmed	Controlling soil disturbance of a lunar regolith simulant bed during depressurization in a vacuum chamber
title_sort	controlling soil disturbance of a lunar regolith simulant bed during depressurization in a vacuum chamber
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/ed77a2f1bda44910acfe5817d25f2200
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Controlling soil disturbance of a lunar regolith simulant bed during depressurization in a vacuum chamber

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