Sutton, G J M (2010) Uncertainty in the TBLC and bulk dissipation corrections for the one litre spheres NPL1 and NPL2, filled with argon at T=273.16K. NPL Report. ENG 25

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Abstract

The uncertainty in the calculated Thermal Boundary Layer Correction (TBLC) / Bulk dissipation correction due to the uncertainty in the input parameters is calculated for the one litre spheres NPL1 / NPL2 filled with argon gas at T = 273.16 K. For typical measurement uncertainties, we find that the combined fractional uncertainty is a maximum at the lowest measurement pressure (50 kPa) and varies from:

0.24 PPM to 0.09 PPM for dF/F moving from the (0,2) to (0,10) mode.
0.24 PPM to 0.14 PPM for G/F moving from the (0,2) to (0,10) mode.

At P = 100 kPa, both uncertainties are less than 0.17 PPM.

Item Type:	Report/Guide (NPL Report)
NPL Report No.:	ENG 25
Keywords:	Boltzmann Constant, Temperature ITS90, acoustic, resonator
Subjects:	Engineering Measurements Engineering Measurements > Thermal
Last Modified:	02 Feb 2018 13:14
URI:	https://eprintspublications.npl.co.uk/id/eprint/4710