Please use this identifier to cite or link to this item: http://hdl.handle.net/10603/336317
Title: Pumping speed of Hydrogen and Helium gases using activated carbons as sorbent material at liquid helium temperature for cryopump applications
Researcher: Gangradey,Ranjana
Guide(s): Tanna, Vipul
Keywords: Cryopump
Ecology and Environment
Environmental Sciences
Life Sciences
University: Nirma University
Completed Date: 2020
Abstract: Cryopump is a widely studied subject and with an inherent scope for improvement. The newlinechallenge lies in pumping the voluminous amount of exhaust gases of the order of 2000 to newline4000 mbar-l/s (especially helium) in a continuous mode. Pumping a colossal mass of gases is newlinea topic of intense demand in the field of vacuum science. The areas demanding massive newlinepumping speed include environmental test facility in space research, fusion plasma devices, newlineaccelerators, laser interferometer gravitational-wave observatory like LIGO, etc. The required newlinepumping speed is of the order of 100 to 500 thousand-l/s, and the market of vacuum pumps newlinefalls scanty of the kind of the pumps needed to fulfil such requirements. Also, when it comes newlineto the pumping of the large volume of light gases like helium and hydrogen, there is a newlinelimitation with commercially available solutions. newlineThe principal objective of the work presented is an experimental investigation of using a newlinespecific kind of charcoal with large surface area, an adhesive which adheres charcoal to metal newlinecryopanels and sorbent coated cryopanels sustaining high temperature which helps in newlineremoving adsorbed gases from pores of the sorbent making it fresh surface. The study of newlineadsorption isotherm of charcoal was carried out to know its pore surface area, pore-volume, newlinepore size, etc. The sorbent used is coconut shell charcoal, it is microporous with pore size in newlinethe range of lt 2 nm and pore surface area of 1285 (± 5%) m2/g. The glue/adhesive was newlinecharacterized for its vacuum compatibility, thermal conductivity, and thermal cycling. To the newlinemetal surface, the charcoal coating is done using a glue. The glue is thermally conducting. It newlineis stable during thermal cycling from 4 K to 200°C and is vacuum compatible with a low newlineoutgassing rate. Indigenously developed charcoal coated sample panels were tested for newlinethermal cycling from 4 K to 2000C. Charcoal and glue was then, used to coat cryopanels with newlinesurface area of 0.1 m2. newlineThe cryopanels are a special kind of heat exchanger plate formed by j
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URI: http://hdl.handle.net/10603/336317
Appears in Departments:Institute of Science

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10_chapter1.pdfAttached File2.37 MBAdobe PDFView/Open
11_chapter2.pdf872.62 kBAdobe PDFView/Open
12_chapter3.pdf2.38 MBAdobe PDFView/Open
13_chapter4.pdf1.35 MBAdobe PDFView/Open
14_chapter5.pdf970.62 kBAdobe PDFView/Open
15_chapter6.pdf948.73 kBAdobe PDFView/Open
16_chapter7.pdf2.76 MBAdobe PDFView/Open
17_conclusion future work.pdf28.16 kBAdobe PDFView/Open
18_annexure.pdf279.86 kBAdobe PDFView/Open
19_bibilography.pdf76.24 kBAdobe PDFView/Open
1_title.pdf40.35 kBAdobe PDFView/Open
2_certificate.pdf339.42 kBAdobe PDFView/Open
3_abstract.pdf24.55 kBAdobe PDFView/Open
4_declaration.pdf366.28 kBAdobe PDFView/Open
5_acknowledgement.pdf589.27 kBAdobe PDFView/Open
6_contents.pdf31.61 kBAdobe PDFView/Open
7_list_of_tables.pdf21.24 kBAdobe PDFView/Open
80_recommendation.pdf559.17 kBAdobe PDFView/Open
8_list_of_figures.pdf46.42 kBAdobe PDFView/Open
9_list_of_abbreviations.pdf25.22 kBAdobe PDFView/Open
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