DSMC analysis of thermal transpiration of capacitance diaphragm gauge

Shin Ichi Nishizawa, Masahiro Hirata

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

The capacitance diaphragm gauge (CDG) is one of the most important vacuum gauges in low and medium vacuum ranges. CDG has a non-linear sensitivity below 100Pa because of the temperature difference between the sensor head and the vacuum chamber, which is called thermal transpiration. This sensitivity depends on gas species and pressure. In this study, by using a direct simulation Monte Carlo (DSMC) method, pressure distribution in the connecting tube of the gauge was obtained under the pressure range from molecular flow regime to viscous flow regime (10-2-102Pa) taking account of the temperature distribution along the connecting tube. Furthermore, the pressure dependence of the sensitivity of the CDG was derived from the pressure difference between the hot and cold ends, and found to be in good agreement with the pressure dependence of sensitivity obtained by an empirical equation. The influence of gas-surface interaction on the thermal transpiration was also analyzed.

Original languageEnglish
Pages (from-to)301-306
Number of pages6
JournalVacuum
Volume67
Issue number3-4
DOIs
Publication statusPublished - Sep 26 2002
Externally publishedYes

Fingerprint

transpiration
Transpiration
diaphragms
Diaphragms
Gages
Capacitance
capacitance
sensitivity
pressure dependence
simulation
molecular flow
vacuum gages
tubes
low vacuum
Gases
Vacuum gages
Vacuum
viscous flow
vacuum chambers
gases

All Science Journal Classification (ASJC) codes

  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films

Cite this

DSMC analysis of thermal transpiration of capacitance diaphragm gauge. / Nishizawa, Shin Ichi; Hirata, Masahiro.

In: Vacuum, Vol. 67, No. 3-4, 26.09.2002, p. 301-306.

Research output: Contribution to journalArticle

Nishizawa, Shin Ichi ; Hirata, Masahiro. / DSMC analysis of thermal transpiration of capacitance diaphragm gauge. In: Vacuum. 2002 ; Vol. 67, No. 3-4. pp. 301-306.
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