2020
DOI: 10.1007/s10765-020-02686-9
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Numerical and Experimental Study of the Hydrostatic Pressure Correction in Gas Thermometry: A Case in the SPRIGT

Abstract: Single-pressure refractive-index gas thermometry (SPRIGT) is a new type of primary thermometry, which needs an extremely stable working pressure (stability <4 ppm). In practice, the pressure control system at room temperature is located above the cold resonator at 5 K to 25 K, and a long pressure-tube is used to connect them, which entails a hydrostatic pressure correction (HPC). To this end, a three-dimensional (3D) Computational Fluid Dynamics (CFD) simulation model of the pressure tube was developed and com… Show more

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Cited by 5 publications
(3 citation statements)
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“…The temperature distribution for each segment is assumed to be linear. The calculation was verified in a recent paper [47]. The hydrostatic head correction is thus…”
Section: Hydrostatic Head Correctionmentioning
confidence: 60%
“…The temperature distribution for each segment is assumed to be linear. The calculation was verified in a recent paper [47]. The hydrostatic head correction is thus…”
Section: Hydrostatic Head Correctionmentioning
confidence: 60%
“…These posts are internally bored by 4 mm diameter ducts and heat-sunk to the experimental vessel and the two cooling stages of the cryostat. This system simplifies the calculation of the pressure correction accounting for the aerostatic weight of the gas column, as first suggested by Astrov et al [16] and recently discussed by Pan et al [17]. In our working conditions the pressure correction spans between a minimum of 5.1 Pa when He fills the apparatus at 80 kPa, 161 K, which is relatively equivalent to 63 ppm, and a maximum of 50.4 Pa at 280 kPa, 54.3 K or equivalently 180 ppm when Ne fills the apparatus.…”
Section: Pressure Measurement and Control-gas Puritymentioning
confidence: 88%
“…vacuum recorded at the start and at the end of the sequence showed their consistency at the level of a few ppb. Among the various mathematical combinations of the raw microwave data which may be used for the estimate of κ T,eff (273.16 K), the following p j , n p j , 273.16 K f m p j , 273.16 K f m (0, 273.16 K) (17) can be fitted with a linear model a 0 + a 1 p with a 1 = κ T,eff (273.16 K). Figure 10 shows the residuals for this linear fit, which essentially estimates κ T,eff implementing an extrapolation to zero pressure.…”
Section: Determination Of κ Teff (T) By Microwave Measurements Inmentioning
confidence: 99%