Authors

N. Afshar-Mohajer; C. Y. Wu;N. Sorloaica-Hickman

Comments

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Abbreviated Journal Title

J. Appl. Phys.

Keywords

SOLAR-SYSTEM; PARTICLES; SURFACE; VACUUM; DEM; Physics, Applied

Abstract

Lunar grains become charged by the sun's radiation in the tenuous atmosphere of the moon. This leads to lunar dust levitation and particle deposition which often create serious problems in the costly system deployed in lunar exploration. In this study, an electrostatic lunar dust collector (ELDC) is proposed to address the issue and the discrete element method (DEM) is used to investigate the effects of electrical particle-particle interactions, non-uniformity of the electrostatic field, and characteristics of the ELDC. The simulations on 20-mu m-sized lunar particles reveal the electrical particle-particle interactions of the dust particles within the ELDC plates require 29% higher electrostatic field strength than that without the interactions for 100% collection efficiency. For the given ELDC geometry, consideration of non-uniformity of the electrostatic field along with electrical interactions between particles on the same ELDC geometry leads to a higher requirement of similar to 3.5 kV/m to ensure 100% particle collection. Notably, such an electrostatic field is about 10 3 times less than required for electrodynamic self-cleaning methods. Finally, it is shown for a "half-size" system that the DEM model predicts greater collection efficiency than the Eulerian-based model at all voltages less than required for 100% efficiency. Halving the ELDC dimensions boosts the particle concentration inside the ELDC, as well as the resulting field strength for a given voltage. Though a lunar photovoltaic system was the subject, the results of this study are useful for evaluation of any system for collecting charged particles in other high vacuum environment using an electrostatic field.

Journal Title

Journal of Applied Physics

Volume

112

Issue/Number

2

Publication Date

1-1-2012

Document Type

Article

Language

English

First Page

9

WOS Identifier

WOS:000308424500023

ISSN

0021-8979

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