NUMERICAL MODELLING OF PIRANI SENSOR

Felix Sharipov, Guilherme Bertoldo

Abstract

Numerical calculations of heat flux in the Pirani sens were carried out for a wide range of the gas rarefaction based on the kinetic Boltzmann equation. To take into account a non-diffuse gas-surface interaction the Cercignani-Lampis scattering kernel was used in the boundary condition. Such a kernel allowed us to study the influence of the momentum and energy accommodation coefficients on the heat transfer from the sensor wire into surrounding gas. The present results can be applied to improve the precision of pressure measurements by Pirani sensor.

Keywords

Pressure measurements, Pirani sensor, Boltzmann equation

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PWC-2006-TC16-011u.pdf

DOI

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IMEKO TC

TC16 - Pressure and Vacuum Measurement

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