CRYOSORPTION OF HYDROGEN BY 12-20K CARBON DIOXIDE CRYODEPOSITS

Abstract

Carbon dioxide cryodeposits were investigated to determine their ability to sorb H2. Various thickness from 0.00005 to 0.001 cm were used, at temperatures of 12, 16, and 20K. Pumping speeds of 28, 19, and 14 l/sec-sq. cm were measured for the respective temperatures. An arbitrary 'Capacity' of the CO2 cryodeposit for H2 was defined. Within the limits of the experimental parameters varied, this capacity was found to be a direct function of the thickness of the cryodeposit and increased logarithmically as the temperature was lowered. No cryopumping of H2 was observed with cryodeposits above 25K. The CO2 cryodeposits were readily contaminated by N2, and the H2 pumping speed dropped when N2 was flowed in simultaneously with the H2.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Jul 01, 1967
Accession Number
AD0655067

Entities

People

  • R. Dawbarn

Organizations

  • Arnold Engineering Development Complex

Tags

Communities of Interest

  • Space

DTIC Thesaurus Topics

  • Air Force
  • Base Pressure
  • Calibration
  • Carbon Dioxide
  • Diffusion Pumps
  • Engineering
  • Flow Rate
  • Gate Valves
  • Ionization Gages
  • Mass Spectrometers
  • Measurement
  • Partial Pressure
  • Pressure Transducers
  • Pumping
  • Thickness
  • Vacuum Chambers
  • Vapor Pressure

Readers

  • Combustion and Flow Dynamics.
  • Mathematics or Statistics
  • Spectroscopy.