Control of Charged Lunar Dust Using Electrostatic Technologies

MISSING IMAGE

Material Information

Title:
Control of Charged Lunar Dust Using Electrostatic Technologies
Physical Description:
1 online resource (145 p.)
Language:
english
Creator:
Afshar Mohajer, Nima
Publisher:
University of Florida
Place of Publication:
Gainesville, Fla.
Publication Date:

Thesis/Dissertation Information

Degree:
Doctorate ( Ph.D.)
Degree Grantor:
University of Florida
Degree Disciplines:
Environmental Engineering Sciences
Committee Chair:
WU,CHANG-YU
Committee Co-Chair:
KOOPMAN,BEN L
Committee Members:
CURTIS,JENNIFER S
MOORE,ROBERT C
SORLOAICA-HICKMAN,NICOLETA

Subjects

Subjects / Keywords:
charged -- collection -- dust -- electrostatic -- lunar -- particles
Environmental Engineering Sciences -- Dissertations, Academic -- UF
Genre:
Environmental Engineering Sciences thesis, Ph.D.
bibliography   ( marcgt )
theses   ( marcgt )
government publication (state, provincial, terriorial, dependent)   ( marcgt )
born-digital   ( sobekcm )
Electronic Thesis or Dissertation

Notes

Abstract:
Protecting sensitive surfaces from dust deposition in the limiting condition of the lunar atmosphere is imperative for future space exploration. An electrostatic lunar dust collector (ELDC) was developed to prevent lunar dust deposition on the exposed surface equipment efficiently. First, Eulerian-based analytical equations were derived to interrelate key parameters. Application of electrostatic field strength of 20kV/m was found to be enough for collecting particles up to 240 micron in size.Then, the Lagrangian-based discrete element method (DEM) was used to track particle trajectories individually. Inclusion of electrical particle-particle interactions and non-uniformity of the e-field provided a more accurate efficiency determination resulting in an e-field strength of 3.5 kV/m for 100%collection of 20-micron particles. How back electrostatic field due to charge build-up on the collection plates affect performance of an ELDC was then studied using a modified DEM model. The maximum time ELDC can run without significant loss in collection efficiency was estimated to be 3 times per month. Finally, the collection efficiency of the ELDC was investigated experimentally inside a vacuum chamber. The results indicated better tribo-chargeability of JSC-1A particles than Chenobi particles. The pattern of the obtained collection inefficiencies were consistent with the theoretical models confirming linear relationship with the applied voltage and non-uniform charge distribution over the collection plate. An electrostatic lunar dust repeller (ELDR) was developed to repel approaching like-charged lunar dust as an alternative approach. This study demonstrated that x-shaped electrode pattern is the most effective electrodes arrangement due to the absence of dead zones in between like-charged electrodes. Modeling results showed that 2.2 kV and 1.4 kV were the minimum needed voltages applied to electrode lengths of 5 and 10 cm, respectively to achieve 100% removal efficiency. The novel technologies introduced in this study offer advantages over previously studied technologies by preventing dust deposition at the first place using low electric power. This study serves as the first step for surface protection of equipment on asteroids and Mars, and paves the road for development of electrostatic shields to protect solar panels and PV cells in arid terrestrial areas to secure consistent power generation.
General Note:
In the series University of Florida Digital Collections.
General Note:
Includes vita.
Bibliography:
Includes bibliographical references.
Source of Description:
Description based on online resource; title from PDF title page.
Source of Description:
This bibliographic record is available under the Creative Commons CC0 public domain dedication. The University of Florida Libraries, as creator of this bibliographic record, has waived all rights to it worldwide under copyright law, including all related and neighboring rights, to the extent allowed by law.
Statement of Responsibility:
by Nima Afshar Mohajer.
Thesis:
Thesis (Ph.D.)--University of Florida, 2014.
Local:
Adviser: WU,CHANG-YU.
Local:
Co-adviser: KOOPMAN,BEN L.
Electronic Access:
RESTRICTED TO UF STUDENTS, STAFF, FACULTY, AND ON-CAMPUS USE UNTIL 2015-05-31

Record Information

Source Institution:
UFRGP
Rights Management:
Applicable rights reserved.
Classification:
lcc - LD1780 2014
System ID:
UFE0046435:00001