Studies on activated carbons towards the performance improvement of cryosorption pump

Verma, R and Nagendra, HN and Vivek, GA and Kasthurirengan, S and Shivaprakash, NC and Behera, U (2020) Studies on activated carbons towards the performance improvement of cryosorption pump. In: Cryogenics, 108 .

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Abstract

Cryosorption pumps are the only possible solution to pump helium gas in Tokamak. In cryosorption pump, due to weak van der Walls forces the adsorbate gas molecules are held by the adsorbent well above the boiling point of the adsorbate gas. Therefore selection of best adsorbent is of utmost importance for the optimum performance of cryosorption pump towards the pumping of helium gas. In this paper, we report the pore size distribution and surface area of different activated carbon adsorbents to arrive at the best activated carbon for the development of cryosorption panel. Also probably for the first time, an attempt has been made to estimate the thermal conductivity of liquid helium based small size prototype cryopanel. The thermal conductivity of the panel has been improved by mixing the fine aluminium powder as filler to the epoxy adhesive. From the experimental studies it is found that KCC/IIS01 is the best adsorbent towards the development of cryosorption pump. Mixing of 35 fine aluminium powder as a filler to the epoxy adhesive improves the thermal conductivity of the cryopanel by ~14 and in turn enhances the pumping speed by ~2.35 times as reported in our earlier studies.

Item Type:	Journal Article
Publication:	Cryogenics
Publisher:	Elsevier Ltd
Additional Information:	The copyright of this article belongs to Elsevier Ltd
Keywords:	Activated carbon; Adhesives; Aluminum; Fillers; Gas adsorption; Gas generators; Helium; Liquefied gases; Mixing; Pore size; Pumps; Superfluid helium; Van der Waals forces, Aluminium powder; Carbon adsorbents; Cryosorption pumps; Epoxy adhesives; Gas molecules; Optimum performance; Pumping speed; Van der Walls forces, Thermal conductivity
Department/Centre:	Division of Physical & Mathematical Sciences > Centre for Cryogenic Technology Division of Physical & Mathematical Sciences > Instrumentation Appiled Physics
Date Deposited:	26 Aug 2020 06:40
Last Modified:	26 Aug 2020 06:40
URI:	http://eprints.iisc.ac.in/id/eprint/66371

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