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Title of Journal: Int J Thermophys

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Abbravation: International Journal of Thermophysics

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Springer US

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DOI

10.1016/8756-3282(90)90086-E

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1572-9567

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Comsol Simulations as a Tool in Validating a Measu

Authors: Antti Lakka Hannu Sairanen Martti Heinonen Richard Högström
Publish Date: 2015/11/23
Volume: 36, Issue: 12, Pages: 3474-3486
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Abstract

The Centre for Metrology and Accreditation MIKES is developing a temperature–humidity calibration system for radiosondes The target minimum air temperature and dewpoint temperature are 80circ C and 90circ C respectively When operating in this range a major limiting factor is the time of stabilization which is mainly affected by the design of the measurement chamber To find an optimal geometry for the chamber we developed a numerical simulation method taking into account heat and mass transfer in the chamber This paper describes the method and its experimental validation using two stainless steel chambers with different geometries The numerical simulation was carried out using Comsol Multiphysics simulation software Equilibrium states of dry air flow at 70circ C with different inlet air flow rates were used to determine the geometry of the chamber It was revealed that the flow is very unstable despite having relatively small Reynolds number values Humidity saturation abilities of the new chamber were studied by simulating water vapor diffusion in the chamber in timedependent mode The differences in time of humidity stabilization after a step change were determined for both the new chamber model and the MIKES Relative Humidity Generator III MRHG model These simulations were used as a validation of the simulation method along with experimental measurements using a spectroscopic hygrometer Humidity saturation stabilization simulations proved the new chamber to be the faster of the two which was confirmed by experimental measurements

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